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<style type='text/css'> html, body { margin: 0; padding: 0; border: 0; } </style> |
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var und = require('lodash'); | |
var q = [{ name: 'larry', age:34},{name:'moe',age:27}]; | |
document.write(und.pluck(q,"age")); |
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require=(function(e,t,n){function i(n,s){if(!t[n]){if(!e[n]){var o=typeof require=="function"&&require;if(!s&&o)return o(n,!0);if(r)return r(n,!0);throw new Error("Cannot find module '"+n+"'")}var u=t[n]={exports:{}};e[n][0].call(u.exports,function(t){var r=e[n][1][t];return i(r?r:t)},u,u.exports)}return t[n].exports}var r=typeof require=="function"&&require;for(var s=0;s<n.length;s++)i(n[s]);return i})({"lodash":[function(require,module,exports){ | |
module.exports=require('6dvPF0'); | |
},{}],"6dvPF0":[function(require,module,exports){ | |
(function(global){/** | |
* @license | |
* Lo-Dash 1.3.1 (Custom Build) <http://lodash.com/> | |
* Build: `lodash modern -o ./dist/lodash.js` | |
* Copyright 2012-2013 The Dojo Foundation <http://dojofoundation.org/> | |
* Based on Underscore.js 1.4.4 <http://underscorejs.org/> | |
* Copyright 2009-2013 Jeremy Ashkenas, DocumentCloud Inc. | |
* Available under MIT license <http://lodash.com/license> | |
*/ | |
;(function(window) { | |
/** Used as a safe reference for `undefined` in pre ES5 environments */ | |
var undefined; | |
/** Used to pool arrays and objects used internally */ | |
var arrayPool = [], | |
objectPool = []; | |
/** Used to generate unique IDs */ | |
var idCounter = 0; | |
/** Used internally to indicate various things */ | |
var indicatorObject = {}; | |
/** Used to prefix keys to avoid issues with `__proto__` and properties on `Object.prototype` */ | |
var keyPrefix = +new Date + ''; | |
/** Used as the size when optimizations are enabled for large arrays */ | |
var largeArraySize = 75; | |
/** Used as the max size of the `arrayPool` and `objectPool` */ | |
var maxPoolSize = 40; | |
/** Used to match empty string literals in compiled template source */ | |
var reEmptyStringLeading = /\b__p \+= '';/g, | |
reEmptyStringMiddle = /\b(__p \+=) '' \+/g, | |
reEmptyStringTrailing = /(__e\(.*?\)|\b__t\)) \+\n'';/g; | |
/** Used to match HTML entities */ | |
var reEscapedHtml = /&(?:amp|lt|gt|quot|#39);/g; | |
/** | |
* Used to match ES6 template delimiters | |
* http://people.mozilla.org/~jorendorff/es6-draft.html#sec-7.8.6 | |
*/ | |
var reEsTemplate = /\$\{([^\\}]*(?:\\.[^\\}]*)*)\}/g; | |
/** Used to match regexp flags from their coerced string values */ | |
var reFlags = /\w*$/; | |
/** Used to match "interpolate" template delimiters */ | |
var reInterpolate = /<%=([\s\S]+?)%>/g; | |
/** Used to detect functions containing a `this` reference */ | |
var reThis = (reThis = /\bthis\b/) && reThis.test(runInContext) && reThis; | |
/** Used to detect and test whitespace */ | |
var whitespace = ( | |
// whitespace | |
' \t\x0B\f\xA0\ufeff' + | |
// line terminators | |
'\n\r\u2028\u2029' + | |
// unicode category "Zs" space separators | |
'\u1680\u180e\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\u202f\u205f\u3000' | |
); | |
/** Used to match leading whitespace and zeros to be removed */ | |
var reLeadingSpacesAndZeros = RegExp('^[' + whitespace + ']*0+(?=.$)'); | |
/** Used to ensure capturing order of template delimiters */ | |
var reNoMatch = /($^)/; | |
/** Used to match HTML characters */ | |
var reUnescapedHtml = /[&<>"']/g; | |
/** Used to match unescaped characters in compiled string literals */ | |
var reUnescapedString = /['\n\r\t\u2028\u2029\\]/g; | |
/** Used to assign default `context` object properties */ | |
var contextProps = [ | |
'Array', 'Boolean', 'Date', 'Function', 'Math', 'Number', 'Object', | |
'RegExp', 'String', '_', 'attachEvent', 'clearTimeout', 'isFinite', 'isNaN', | |
'parseInt', 'setImmediate', 'setTimeout' | |
]; | |
/** Used to make template sourceURLs easier to identify */ | |
var templateCounter = 0; | |
/** `Object#toString` result shortcuts */ | |
var argsClass = '[object Arguments]', | |
arrayClass = '[object Array]', | |
boolClass = '[object Boolean]', | |
dateClass = '[object Date]', | |
errorClass = '[object Error]', | |
funcClass = '[object Function]', | |
numberClass = '[object Number]', | |
objectClass = '[object Object]', | |
regexpClass = '[object RegExp]', | |
stringClass = '[object String]'; | |
/** Used to identify object classifications that `_.clone` supports */ | |
var cloneableClasses = {}; | |
cloneableClasses[funcClass] = false; | |
cloneableClasses[argsClass] = cloneableClasses[arrayClass] = | |
cloneableClasses[boolClass] = cloneableClasses[dateClass] = | |
cloneableClasses[numberClass] = cloneableClasses[objectClass] = | |
cloneableClasses[regexpClass] = cloneableClasses[stringClass] = true; | |
/** Used to determine if values are of the language type Object */ | |
var objectTypes = { | |
'boolean': false, | |
'function': true, | |
'object': true, | |
'number': false, | |
'string': false, | |
'undefined': false | |
}; | |
/** Used to escape characters for inclusion in compiled string literals */ | |
var stringEscapes = { | |
'\\': '\\', | |
"'": "'", | |
'\n': 'n', | |
'\r': 'r', | |
'\t': 't', | |
'\u2028': 'u2028', | |
'\u2029': 'u2029' | |
}; | |
/** Detect free variable `exports` */ | |
var freeExports = objectTypes[typeof exports] && exports; | |
/** Detect free variable `module` */ | |
var freeModule = objectTypes[typeof module] && module && module.exports == freeExports && module; | |
/** Detect free variable `global`, from Node.js or Browserified code, and use it as `window` */ | |
var freeGlobal = objectTypes[typeof global] && global; | |
if (freeGlobal && (freeGlobal.global === freeGlobal || freeGlobal.window === freeGlobal)) { | |
window = freeGlobal; | |
} | |
/*--------------------------------------------------------------------------*/ | |
/** | |
* A basic implementation of `_.indexOf` without support for binary searches | |
* or `fromIndex` constraints. | |
* | |
* @private | |
* @param {Array} array The array to search. | |
* @param {Mixed} value The value to search for. | |
* @param {Number} [fromIndex=0] The index to search from. | |
* @returns {Number} Returns the index of the matched value or `-1`. | |
*/ | |
function basicIndexOf(array, value, fromIndex) { | |
var index = (fromIndex || 0) - 1, | |
length = array.length; | |
while (++index < length) { | |
if (array[index] === value) { | |
return index; | |
} | |
} | |
return -1; | |
} | |
/** | |
* An implementation of `_.contains` for cache objects that mimics the return | |
* signature of `_.indexOf` by returning `0` if the value is found, else `-1`. | |
* | |
* @private | |
* @param {Object} cache The cache object to inspect. | |
* @param {Mixed} value The value to search for. | |
* @returns {Number} Returns `0` if `value` is found, else `-1`. | |
*/ | |
function cacheIndexOf(cache, value) { | |
var type = typeof value; | |
cache = cache.cache; | |
if (type == 'boolean' || value == null) { | |
return cache[value]; | |
} | |
if (type != 'number' && type != 'string') { | |
type = 'object'; | |
} | |
var key = type == 'number' ? value : keyPrefix + value; | |
cache = cache[type] || (cache[type] = {}); | |
return type == 'object' | |
? (cache[key] && basicIndexOf(cache[key], value) > -1 ? 0 : -1) | |
: (cache[key] ? 0 : -1); | |
} | |
/** | |
* Adds a given `value` to the corresponding cache object. | |
* | |
* @private | |
* @param {Mixed} value The value to add to the cache. | |
*/ | |
function cachePush(value) { | |
var cache = this.cache, | |
type = typeof value; | |
if (type == 'boolean' || value == null) { | |
cache[value] = true; | |
} else { | |
if (type != 'number' && type != 'string') { | |
type = 'object'; | |
} | |
var key = type == 'number' ? value : keyPrefix + value, | |
typeCache = cache[type] || (cache[type] = {}); | |
if (type == 'object') { | |
if ((typeCache[key] || (typeCache[key] = [])).push(value) == this.array.length) { | |
cache[type] = false; | |
} | |
} else { | |
typeCache[key] = true; | |
} | |
} | |
} | |
/** | |
* Used by `_.max` and `_.min` as the default `callback` when a given | |
* `collection` is a string value. | |
* | |
* @private | |
* @param {String} value The character to inspect. | |
* @returns {Number} Returns the code unit of given character. | |
*/ | |
function charAtCallback(value) { | |
return value.charCodeAt(0); | |
} | |
/** | |
* Used by `sortBy` to compare transformed `collection` values, stable sorting | |
* them in ascending order. | |
* | |
* @private | |
* @param {Object} a The object to compare to `b`. | |
* @param {Object} b The object to compare to `a`. | |
* @returns {Number} Returns the sort order indicator of `1` or `-1`. | |
*/ | |
function compareAscending(a, b) { | |
var ai = a.index, | |
bi = b.index; | |
a = a.criteria; | |
b = b.criteria; | |
// ensure a stable sort in V8 and other engines | |
// http://code.google.com/p/v8/issues/detail?id=90 | |
if (a !== b) { | |
if (a > b || typeof a == 'undefined') { | |
return 1; | |
} | |
if (a < b || typeof b == 'undefined') { | |
return -1; | |
} | |
} | |
return ai < bi ? -1 : 1; | |
} | |
/** | |
* Creates a cache object to optimize linear searches of large arrays. | |
* | |
* @private | |
* @param {Array} [array=[]] The array to search. | |
* @returns {Null|Object} Returns the cache object or `null` if caching should not be used. | |
*/ | |
function createCache(array) { | |
var index = -1, | |
length = array.length; | |
var cache = getObject(); | |
cache['false'] = cache['null'] = cache['true'] = cache['undefined'] = false; | |
var result = getObject(); | |
result.array = array; | |
result.cache = cache; | |
result.push = cachePush; | |
while (++index < length) { | |
result.push(array[index]); | |
} | |
return cache.object === false | |
? (releaseObject(result), null) | |
: result; | |
} | |
/** | |
* Used by `template` to escape characters for inclusion in compiled | |
* string literals. | |
* | |
* @private | |
* @param {String} match The matched character to escape. | |
* @returns {String} Returns the escaped character. | |
*/ | |
function escapeStringChar(match) { | |
return '\\' + stringEscapes[match]; | |
} | |
/** | |
* Gets an array from the array pool or creates a new one if the pool is empty. | |
* | |
* @private | |
* @returns {Array} The array from the pool. | |
*/ | |
function getArray() { | |
return arrayPool.pop() || []; | |
} | |
/** | |
* Gets an object from the object pool or creates a new one if the pool is empty. | |
* | |
* @private | |
* @returns {Object} The object from the pool. | |
*/ | |
function getObject() { | |
return objectPool.pop() || { | |
'array': null, | |
'cache': null, | |
'criteria': null, | |
'false': false, | |
'index': 0, | |
'leading': false, | |
'maxWait': 0, | |
'null': false, | |
'number': null, | |
'object': null, | |
'push': null, | |
'string': null, | |
'trailing': false, | |
'true': false, | |
'undefined': false, | |
'value': null | |
}; | |
} | |
/** | |
* A no-operation function. | |
* | |
* @private | |
*/ | |
function noop() { | |
// no operation performed | |
} | |
/** | |
* Releases the given `array` back to the array pool. | |
* | |
* @private | |
* @param {Array} [array] The array to release. | |
*/ | |
function releaseArray(array) { | |
array.length = 0; | |
if (arrayPool.length < maxPoolSize) { | |
arrayPool.push(array); | |
} | |
} | |
/** | |
* Releases the given `object` back to the object pool. | |
* | |
* @private | |
* @param {Object} [object] The object to release. | |
*/ | |
function releaseObject(object) { | |
var cache = object.cache; | |
if (cache) { | |
releaseObject(cache); | |
} | |
object.array = object.cache = object.criteria = object.object = object.number = object.string = object.value = null; | |
if (objectPool.length < maxPoolSize) { | |
objectPool.push(object); | |
} | |
} | |
/** | |
* Slices the `collection` from the `start` index up to, but not including, | |
* the `end` index. | |
* | |
* Note: This function is used, instead of `Array#slice`, to support node lists | |
* in IE < 9 and to ensure dense arrays are returned. | |
* | |
* @private | |
* @param {Array|Object|String} collection The collection to slice. | |
* @param {Number} start The start index. | |
* @param {Number} end The end index. | |
* @returns {Array} Returns the new array. | |
*/ | |
function slice(array, start, end) { | |
start || (start = 0); | |
if (typeof end == 'undefined') { | |
end = array ? array.length : 0; | |
} | |
var index = -1, | |
length = end - start || 0, | |
result = Array(length < 0 ? 0 : length); | |
while (++index < length) { | |
result[index] = array[start + index]; | |
} | |
return result; | |
} | |
/*--------------------------------------------------------------------------*/ | |
/** | |
* Create a new `lodash` function using the given `context` object. | |
* | |
* @static | |
* @memberOf _ | |
* @category Utilities | |
* @param {Object} [context=window] The context object. | |
* @returns {Function} Returns the `lodash` function. | |
*/ | |
function runInContext(context) { | |
// Avoid issues with some ES3 environments that attempt to use values, named | |
// after built-in constructors like `Object`, for the creation of literals. | |
// ES5 clears this up by stating that literals must use built-in constructors. | |
// See http://es5.github.com/#x11.1.5. | |
context = context ? _.defaults(window.Object(), context, _.pick(window, contextProps)) : window; | |
/** Native constructor references */ | |
var Array = context.Array, | |
Boolean = context.Boolean, | |
Date = context.Date, | |
Function = context.Function, | |
Math = context.Math, | |
Number = context.Number, | |
Object = context.Object, | |
RegExp = context.RegExp, | |
String = context.String, | |
TypeError = context.TypeError; | |
/** | |
* Used for `Array` method references. | |
* | |
* Normally `Array.prototype` would suffice, however, using an array literal | |
* avoids issues in Narwhal. | |
*/ | |
var arrayRef = []; | |
/** Used for native method references */ | |
var objectProto = Object.prototype, | |
stringProto = String.prototype; | |
/** Used to restore the original `_` reference in `noConflict` */ | |
var oldDash = context._; | |
/** Used to detect if a method is native */ | |
var reNative = RegExp('^' + | |
String(objectProto.valueOf) | |
.replace(/[.*+?^${}()|[\]\\]/g, '\\$&') | |
.replace(/valueOf|for [^\]]+/g, '.+?') + '$' | |
); | |
/** Native method shortcuts */ | |
var ceil = Math.ceil, | |
clearTimeout = context.clearTimeout, | |
concat = arrayRef.concat, | |
floor = Math.floor, | |
fnToString = Function.prototype.toString, | |
getPrototypeOf = reNative.test(getPrototypeOf = Object.getPrototypeOf) && getPrototypeOf, | |
hasOwnProperty = objectProto.hasOwnProperty, | |
push = arrayRef.push, | |
propertyIsEnumerable = objectProto.propertyIsEnumerable, | |
setImmediate = context.setImmediate, | |
setTimeout = context.setTimeout, | |
toString = objectProto.toString; | |
/* Native method shortcuts for methods with the same name as other `lodash` methods */ | |
var nativeBind = reNative.test(nativeBind = toString.bind) && nativeBind, | |
nativeCreate = reNative.test(nativeCreate = Object.create) && nativeCreate, | |
nativeIsArray = reNative.test(nativeIsArray = Array.isArray) && nativeIsArray, | |
nativeIsFinite = context.isFinite, | |
nativeIsNaN = context.isNaN, | |
nativeKeys = reNative.test(nativeKeys = Object.keys) && nativeKeys, | |
nativeMax = Math.max, | |
nativeMin = Math.min, | |
nativeParseInt = context.parseInt, | |
nativeRandom = Math.random, | |
nativeSlice = arrayRef.slice; | |
/** Detect various environments */ | |
var isIeOpera = reNative.test(context.attachEvent), | |
isV8 = nativeBind && !/\n|true/.test(nativeBind + isIeOpera); | |
/** Used to lookup a built-in constructor by [[Class]] */ | |
var ctorByClass = {}; | |
ctorByClass[arrayClass] = Array; | |
ctorByClass[boolClass] = Boolean; | |
ctorByClass[dateClass] = Date; | |
ctorByClass[funcClass] = Function; | |
ctorByClass[objectClass] = Object; | |
ctorByClass[numberClass] = Number; | |
ctorByClass[regexpClass] = RegExp; | |
ctorByClass[stringClass] = String; | |
/*--------------------------------------------------------------------------*/ | |
/** | |
* Creates a `lodash` object, which wraps the given `value`, to enable method | |
* chaining. | |
* | |
* In addition to Lo-Dash methods, wrappers also have the following `Array` methods: | |
* `concat`, `join`, `pop`, `push`, `reverse`, `shift`, `slice`, `sort`, `splice`, | |
* and `unshift` | |
* | |
* Chaining is supported in custom builds as long as the `value` method is | |
* implicitly or explicitly included in the build. | |
* | |
* The chainable wrapper functions are: | |
* `after`, `assign`, `bind`, `bindAll`, `bindKey`, `chain`, `compact`, | |
* `compose`, `concat`, `countBy`, `createCallback`, `debounce`, `defaults`, | |
* `defer`, `delay`, `difference`, `filter`, `flatten`, `forEach`, `forIn`, | |
* `forOwn`, `functions`, `groupBy`, `initial`, `intersection`, `invert`, | |
* `invoke`, `keys`, `map`, `max`, `memoize`, `merge`, `min`, `object`, `omit`, | |
* `once`, `pairs`, `partial`, `partialRight`, `pick`, `pluck`, `push`, `range`, | |
* `reject`, `rest`, `reverse`, `shuffle`, `slice`, `sort`, `sortBy`, `splice`, | |
* `tap`, `throttle`, `times`, `toArray`, `transform`, `union`, `uniq`, `unshift`, | |
* `unzip`, `values`, `where`, `without`, `wrap`, and `zip` | |
* | |
* The non-chainable wrapper functions are: | |
* `clone`, `cloneDeep`, `contains`, `escape`, `every`, `find`, `has`, | |
* `identity`, `indexOf`, `isArguments`, `isArray`, `isBoolean`, `isDate`, | |
* `isElement`, `isEmpty`, `isEqual`, `isFinite`, `isFunction`, `isNaN`, | |
* `isNull`, `isNumber`, `isObject`, `isPlainObject`, `isRegExp`, `isString`, | |
* `isUndefined`, `join`, `lastIndexOf`, `mixin`, `noConflict`, `parseInt`, | |
* `pop`, `random`, `reduce`, `reduceRight`, `result`, `shift`, `size`, `some`, | |
* `sortedIndex`, `runInContext`, `template`, `unescape`, `uniqueId`, and `value` | |
* | |
* The wrapper functions `first` and `last` return wrapped values when `n` is | |
* passed, otherwise they return unwrapped values. | |
* | |
* @name _ | |
* @constructor | |
* @alias chain | |
* @category Chaining | |
* @param {Mixed} value The value to wrap in a `lodash` instance. | |
* @returns {Object} Returns a `lodash` instance. | |
* @example | |
* | |
* var wrapped = _([1, 2, 3]); | |
* | |
* // returns an unwrapped value | |
* wrapped.reduce(function(sum, num) { | |
* return sum + num; | |
* }); | |
* // => 6 | |
* | |
* // returns a wrapped value | |
* var squares = wrapped.map(function(num) { | |
* return num * num; | |
* }); | |
* | |
* _.isArray(squares); | |
* // => false | |
* | |
* _.isArray(squares.value()); | |
* // => true | |
*/ | |
function lodash(value) { | |
// don't wrap if already wrapped, even if wrapped by a different `lodash` constructor | |
return (value && typeof value == 'object' && !isArray(value) && hasOwnProperty.call(value, '__wrapped__')) | |
? value | |
: new lodashWrapper(value); | |
} | |
/** | |
* A fast path for creating `lodash` wrapper objects. | |
* | |
* @private | |
* @param {Mixed} value The value to wrap in a `lodash` instance. | |
* @returns {Object} Returns a `lodash` instance. | |
*/ | |
function lodashWrapper(value) { | |
this.__wrapped__ = value; | |
} | |
// ensure `new lodashWrapper` is an instance of `lodash` | |
lodashWrapper.prototype = lodash.prototype; | |
/** | |
* An object used to flag environments features. | |
* | |
* @static | |
* @memberOf _ | |
* @type Object | |
*/ | |
var support = lodash.support = {}; | |
/** | |
* Detect if `Function#bind` exists and is inferred to be fast (all but V8). | |
* | |
* @memberOf _.support | |
* @type Boolean | |
*/ | |
support.fastBind = nativeBind && !isV8; | |
/** | |
* By default, the template delimiters used by Lo-Dash are similar to those in | |
* embedded Ruby (ERB). Change the following template settings to use alternative | |
* delimiters. | |
* | |
* @static | |
* @memberOf _ | |
* @type Object | |
*/ | |
lodash.templateSettings = { | |
/** | |
* Used to detect `data` property values to be HTML-escaped. | |
* | |
* @memberOf _.templateSettings | |
* @type RegExp | |
*/ | |
'escape': /<%-([\s\S]+?)%>/g, | |
/** | |
* Used to detect code to be evaluated. | |
* | |
* @memberOf _.templateSettings | |
* @type RegExp | |
*/ | |
'evaluate': /<%([\s\S]+?)%>/g, | |
/** | |
* Used to detect `data` property values to inject. | |
* | |
* @memberOf _.templateSettings | |
* @type RegExp | |
*/ | |
'interpolate': reInterpolate, | |
/** | |
* Used to reference the data object in the template text. | |
* | |
* @memberOf _.templateSettings | |
* @type String | |
*/ | |
'variable': '', | |
/** | |
* Used to import variables into the compiled template. | |
* | |
* @memberOf _.templateSettings | |
* @type Object | |
*/ | |
'imports': { | |
/** | |
* A reference to the `lodash` function. | |
* | |
* @memberOf _.templateSettings.imports | |
* @type Function | |
*/ | |
'_': lodash | |
} | |
}; | |
/*--------------------------------------------------------------------------*/ | |
/** | |
* Creates a function that, when called, invokes `func` with the `this` binding | |
* of `thisArg` and prepends any `partialArgs` to the arguments passed to the | |
* bound function. | |
* | |
* @private | |
* @param {Function|String} func The function to bind or the method name. | |
* @param {Mixed} [thisArg] The `this` binding of `func`. | |
* @param {Array} partialArgs An array of arguments to be partially applied. | |
* @param {Object} [idicator] Used to indicate binding by key or partially | |
* applying arguments from the right. | |
* @returns {Function} Returns the new bound function. | |
*/ | |
function createBound(func, thisArg, partialArgs, indicator) { | |
var isFunc = isFunction(func), | |
isPartial = !partialArgs, | |
key = thisArg; | |
// juggle arguments | |
if (isPartial) { | |
var rightIndicator = indicator; | |
partialArgs = thisArg; | |
} | |
else if (!isFunc) { | |
if (!indicator) { | |
throw new TypeError; | |
} | |
thisArg = func; | |
} | |
function bound() { | |
// `Function#bind` spec | |
// http://es5.github.com/#x15.3.4.5 | |
var args = arguments, | |
thisBinding = isPartial ? this : thisArg; | |
if (!isFunc) { | |
func = thisArg[key]; | |
} | |
if (partialArgs.length) { | |
args = args.length | |
? (args = nativeSlice.call(args), rightIndicator ? args.concat(partialArgs) : partialArgs.concat(args)) | |
: partialArgs; | |
} | |
if (this instanceof bound) { | |
// ensure `new bound` is an instance of `func` | |
thisBinding = createObject(func.prototype); | |
// mimic the constructor's `return` behavior | |
// http://es5.github.com/#x13.2.2 | |
var result = func.apply(thisBinding, args); | |
return isObject(result) ? result : thisBinding; | |
} | |
return func.apply(thisBinding, args); | |
} | |
return bound; | |
} | |
/** | |
* Creates a new object with the specified `prototype`. | |
* | |
* @private | |
* @param {Object} prototype The prototype object. | |
* @returns {Object} Returns the new object. | |
*/ | |
function createObject(prototype) { | |
return isObject(prototype) ? nativeCreate(prototype) : {}; | |
} | |
/** | |
* Used by `escape` to convert characters to HTML entities. | |
* | |
* @private | |
* @param {String} match The matched character to escape. | |
* @returns {String} Returns the escaped character. | |
*/ | |
function escapeHtmlChar(match) { | |
return htmlEscapes[match]; | |
} | |
/** | |
* Gets the appropriate "indexOf" function. If the `_.indexOf` method is | |
* customized, this method returns the custom method, otherwise it returns | |
* the `basicIndexOf` function. | |
* | |
* @private | |
* @returns {Function} Returns the "indexOf" function. | |
*/ | |
function getIndexOf(array, value, fromIndex) { | |
var result = (result = lodash.indexOf) === indexOf ? basicIndexOf : result; | |
return result; | |
} | |
/** | |
* Creates a function that juggles arguments, allowing argument overloading | |
* for `_.flatten` and `_.uniq`, before passing them to the given `func`. | |
* | |
* @private | |
* @param {Function} func The function to wrap. | |
* @returns {Function} Returns the new function. | |
*/ | |
function overloadWrapper(func) { | |
return function(array, flag, callback, thisArg) { | |
// juggle arguments | |
if (typeof flag != 'boolean' && flag != null) { | |
thisArg = callback; | |
callback = !(thisArg && thisArg[flag] === array) ? flag : undefined; | |
flag = false; | |
} | |
if (callback != null) { | |
callback = lodash.createCallback(callback, thisArg); | |
} | |
return func(array, flag, callback, thisArg); | |
}; | |
} | |
/** | |
* A fallback implementation of `isPlainObject` which checks if a given `value` | |
* is an object created by the `Object` constructor, assuming objects created | |
* by the `Object` constructor have no inherited enumerable properties and that | |
* there are no `Object.prototype` extensions. | |
* | |
* @private | |
* @param {Mixed} value The value to check. | |
* @returns {Boolean} Returns `true`, if `value` is a plain object, else `false`. | |
*/ | |
function shimIsPlainObject(value) { | |
var ctor, | |
result; | |
// avoid non Object objects, `arguments` objects, and DOM elements | |
if (!(value && toString.call(value) == objectClass) || | |
(ctor = value.constructor, isFunction(ctor) && !(ctor instanceof ctor))) { | |
return false; | |
} | |
// In most environments an object's own properties are iterated before | |
// its inherited properties. If the last iterated property is an object's | |
// own property then there are no inherited enumerable properties. | |
forIn(value, function(value, key) { | |
result = key; | |
}); | |
return result === undefined || hasOwnProperty.call(value, result); | |
} | |
/** | |
* Used by `unescape` to convert HTML entities to characters. | |
* | |
* @private | |
* @param {String} match The matched character to unescape. | |
* @returns {String} Returns the unescaped character. | |
*/ | |
function unescapeHtmlChar(match) { | |
return htmlUnescapes[match]; | |
} | |
/*--------------------------------------------------------------------------*/ | |
/** | |
* Checks if `value` is an `arguments` object. | |
* | |
* @static | |
* @memberOf _ | |
* @category Objects | |
* @param {Mixed} value The value to check. | |
* @returns {Boolean} Returns `true`, if the `value` is an `arguments` object, else `false`. | |
* @example | |
* | |
* (function() { return _.isArguments(arguments); })(1, 2, 3); | |
* // => true | |
* | |
* _.isArguments([1, 2, 3]); | |
* // => false | |
*/ | |
function isArguments(value) { | |
return toString.call(value) == argsClass; | |
} | |
/** | |
* Checks if `value` is an array. | |
* | |
* @static | |
* @memberOf _ | |
* @category Objects | |
* @param {Mixed} value The value to check. | |
* @returns {Boolean} Returns `true`, if the `value` is an array, else `false`. | |
* @example | |
* | |
* (function() { return _.isArray(arguments); })(); | |
* // => false | |
* | |
* _.isArray([1, 2, 3]); | |
* // => true | |
*/ | |
var isArray = nativeIsArray; | |
/** | |
* A fallback implementation of `Object.keys` which produces an array of the | |
* given object's own enumerable property names. | |
* | |
* @private | |
* @type Function | |
* @param {Object} object The object to inspect. | |
* @returns {Array} Returns a new array of property names. | |
*/ | |
var shimKeys = function (object) { | |
var index, iterable = object, result = []; | |
if (!iterable) return result; | |
if (!(objectTypes[typeof object])) return result; | |
for (index in iterable) { | |
if (hasOwnProperty.call(iterable, index)) { | |
result.push(index); | |
} | |
} | |
return result | |
}; | |
/** | |
* Creates an array composed of the own enumerable property names of `object`. | |
* | |
* @static | |
* @memberOf _ | |
* @category Objects | |
* @param {Object} object The object to inspect. | |
* @returns {Array} Returns a new array of property names. | |
* @example | |
* | |
* _.keys({ 'one': 1, 'two': 2, 'three': 3 }); | |
* // => ['one', 'two', 'three'] (order is not guaranteed) | |
*/ | |
var keys = !nativeKeys ? shimKeys : function(object) { | |
if (!isObject(object)) { | |
return []; | |
} | |
return nativeKeys(object); | |
}; | |
/** | |
* Used to convert characters to HTML entities: | |
* | |
* Though the `>` character is escaped for symmetry, characters like `>` and `/` | |
* don't require escaping in HTML and have no special meaning unless they're part | |
* of a tag or an unquoted attribute value. | |
* http://mathiasbynens.be/notes/ambiguous-ampersands (under "semi-related fun fact") | |
*/ | |
var htmlEscapes = { | |
'&': '&', | |
'<': '<', | |
'>': '>', | |
'"': '"', | |
"'": ''' | |
}; | |
/** Used to convert HTML entities to characters */ | |
var htmlUnescapes = invert(htmlEscapes); | |
/*--------------------------------------------------------------------------*/ | |
/** | |
* Assigns own enumerable properties of source object(s) to the destination | |
* object. Subsequent sources will overwrite property assignments of previous | |
* sources. If a `callback` function is passed, it will be executed to produce | |
* the assigned values. The `callback` is bound to `thisArg` and invoked with | |
* two arguments; (objectValue, sourceValue). | |
* | |
* @static | |
* @memberOf _ | |
* @type Function | |
* @alias extend | |
* @category Objects | |
* @param {Object} object The destination object. | |
* @param {Object} [source1, source2, ...] The source objects. | |
* @param {Function} [callback] The function to customize assigning values. | |
* @param {Mixed} [thisArg] The `this` binding of `callback`. | |
* @returns {Object} Returns the destination object. | |
* @example | |
* | |
* _.assign({ 'name': 'moe' }, { 'age': 40 }); | |
* // => { 'name': 'moe', 'age': 40 } | |
* | |
* var defaults = _.partialRight(_.assign, function(a, b) { | |
* return typeof a == 'undefined' ? b : a; | |
* }); | |
* | |
* var food = { 'name': 'apple' }; | |
* defaults(food, { 'name': 'banana', 'type': 'fruit' }); | |
* // => { 'name': 'apple', 'type': 'fruit' } | |
*/ | |
var assign = function (object, source, guard) { | |
var index, iterable = object, result = iterable; | |
if (!iterable) return result; | |
var args = arguments, | |
argsIndex = 0, | |
argsLength = typeof guard == 'number' ? 2 : args.length; | |
if (argsLength > 3 && typeof args[argsLength - 2] == 'function') { | |
var callback = lodash.createCallback(args[--argsLength - 1], args[argsLength--], 2); | |
} else if (argsLength > 2 && typeof args[argsLength - 1] == 'function') { | |
callback = args[--argsLength]; | |
} | |
while (++argsIndex < argsLength) { | |
iterable = args[argsIndex]; | |
if (iterable && objectTypes[typeof iterable]) { | |
var ownIndex = -1, | |
ownProps = objectTypes[typeof iterable] && keys(iterable), | |
length = ownProps ? ownProps.length : 0; | |
while (++ownIndex < length) { | |
index = ownProps[ownIndex]; | |
result[index] = callback ? callback(result[index], iterable[index]) : iterable[index]; | |
} | |
} | |
} | |
return result | |
}; | |
/** | |
* Creates a clone of `value`. If `deep` is `true`, nested objects will also | |
* be cloned, otherwise they will be assigned by reference. If a `callback` | |
* function is passed, it will be executed to produce the cloned values. If | |
* `callback` returns `undefined`, cloning will be handled by the method instead. | |
* The `callback` is bound to `thisArg` and invoked with one argument; (value). | |
* | |
* @static | |
* @memberOf _ | |
* @category Objects | |
* @param {Mixed} value The value to clone. | |
* @param {Boolean} [deep=false] A flag to indicate a deep clone. | |
* @param {Function} [callback] The function to customize cloning values. | |
* @param {Mixed} [thisArg] The `this` binding of `callback`. | |
* @param- {Array} [stackA=[]] Tracks traversed source objects. | |
* @param- {Array} [stackB=[]] Associates clones with source counterparts. | |
* @returns {Mixed} Returns the cloned `value`. | |
* @example | |
* | |
* var stooges = [ | |
* { 'name': 'moe', 'age': 40 }, | |
* { 'name': 'larry', 'age': 50 } | |
* ]; | |
* | |
* var shallow = _.clone(stooges); | |
* shallow[0] === stooges[0]; | |
* // => true | |
* | |
* var deep = _.clone(stooges, true); | |
* deep[0] === stooges[0]; | |
* // => false | |
* | |
* _.mixin({ | |
* 'clone': _.partialRight(_.clone, function(value) { | |
* return _.isElement(value) ? value.cloneNode(false) : undefined; | |
* }) | |
* }); | |
* | |
* var clone = _.clone(document.body); | |
* clone.childNodes.length; | |
* // => 0 | |
*/ | |
function clone(value, deep, callback, thisArg, stackA, stackB) { | |
var result = value; | |
// allows working with "Collections" methods without using their `callback` | |
// argument, `index|key`, for this method's `callback` | |
if (typeof deep != 'boolean' && deep != null) { | |
thisArg = callback; | |
callback = deep; | |
deep = false; | |
} | |
if (typeof callback == 'function') { | |
callback = (typeof thisArg == 'undefined') | |
? callback | |
: lodash.createCallback(callback, thisArg, 1); | |
result = callback(result); | |
if (typeof result != 'undefined') { | |
return result; | |
} | |
result = value; | |
} | |
// inspect [[Class]] | |
var isObj = isObject(result); | |
if (isObj) { | |
var className = toString.call(result); | |
if (!cloneableClasses[className]) { | |
return result; | |
} | |
var isArr = isArray(result); | |
} | |
// shallow clone | |
if (!isObj || !deep) { | |
return isObj | |
? (isArr ? slice(result) : assign({}, result)) | |
: result; | |
} | |
var ctor = ctorByClass[className]; | |
switch (className) { | |
case boolClass: | |
case dateClass: | |
return new ctor(+result); | |
case numberClass: | |
case stringClass: | |
return new ctor(result); | |
case regexpClass: | |
return ctor(result.source, reFlags.exec(result)); | |
} | |
// check for circular references and return corresponding clone | |
var initedStack = !stackA; | |
stackA || (stackA = getArray()); | |
stackB || (stackB = getArray()); | |
var length = stackA.length; | |
while (length--) { | |
if (stackA[length] == value) { | |
return stackB[length]; | |
} | |
} | |
// init cloned object | |
result = isArr ? ctor(result.length) : {}; | |
// add array properties assigned by `RegExp#exec` | |
if (isArr) { | |
if (hasOwnProperty.call(value, 'index')) { | |
result.index = value.index; | |
} | |
if (hasOwnProperty.call(value, 'input')) { | |
result.input = value.input; | |
} | |
} | |
// add the source value to the stack of traversed objects | |
// and associate it with its clone | |
stackA.push(value); | |
stackB.push(result); | |
// recursively populate clone (susceptible to call stack limits) | |
(isArr ? forEach : forOwn)(value, function(objValue, key) { | |
result[key] = clone(objValue, deep, callback, undefined, stackA, stackB); | |
}); | |
if (initedStack) { | |
releaseArray(stackA); | |
releaseArray(stackB); | |
} | |
return result; | |
} | |
/** | |
* Creates a deep clone of `value`. If a `callback` function is passed, | |
* it will be executed to produce the cloned values. If `callback` returns | |
* `undefined`, cloning will be handled by the method instead. The `callback` | |
* is bound to `thisArg` and invoked with one argument; (value). | |
* | |
* Note: This method is loosely based on the structured clone algorithm. Functions | |
* and DOM nodes are **not** cloned. The enumerable properties of `arguments` objects and | |
* objects created by constructors other than `Object` are cloned to plain `Object` objects. | |
* See http://www.w3.org/TR/html5/infrastructure.html#internal-structured-cloning-algorithm. | |
* | |
* @static | |
* @memberOf _ | |
* @category Objects | |
* @param {Mixed} value The value to deep clone. | |
* @param {Function} [callback] The function to customize cloning values. | |
* @param {Mixed} [thisArg] The `this` binding of `callback`. | |
* @returns {Mixed} Returns the deep cloned `value`. | |
* @example | |
* | |
* var stooges = [ | |
* { 'name': 'moe', 'age': 40 }, | |
* { 'name': 'larry', 'age': 50 } | |
* ]; | |
* | |
* var deep = _.cloneDeep(stooges); | |
* deep[0] === stooges[0]; | |
* // => false | |
* | |
* var view = { | |
* 'label': 'docs', | |
* 'node': element | |
* }; | |
* | |
* var clone = _.cloneDeep(view, function(value) { | |
* return _.isElement(value) ? value.cloneNode(true) : undefined; | |
* }); | |
* | |
* clone.node == view.node; | |
* // => false | |
*/ | |
function cloneDeep(value, callback, thisArg) { | |
return clone(value, true, callback, thisArg); | |
} | |
/** | |
* Assigns own enumerable properties of source object(s) to the destination | |
* object for all destination properties that resolve to `undefined`. Once a | |
* property is set, additional defaults of the same property will be ignored. | |
* | |
* @static | |
* @memberOf _ | |
* @type Function | |
* @category Objects | |
* @param {Object} object The destination object. | |
* @param {Object} [source1, source2, ...] The source objects. | |
* @param- {Object} [guard] Allows working with `_.reduce` without using its | |
* callback's `key` and `object` arguments as sources. | |
* @returns {Object} Returns the destination object. | |
* @example | |
* | |
* var food = { 'name': 'apple' }; | |
* _.defaults(food, { 'name': 'banana', 'type': 'fruit' }); | |
* // => { 'name': 'apple', 'type': 'fruit' } | |
*/ | |
var defaults = function (object, source, guard) { | |
var index, iterable = object, result = iterable; | |
if (!iterable) return result; | |
var args = arguments, | |
argsIndex = 0, | |
argsLength = typeof guard == 'number' ? 2 : args.length; | |
while (++argsIndex < argsLength) { | |
iterable = args[argsIndex]; | |
if (iterable && objectTypes[typeof iterable]) { | |
var ownIndex = -1, | |
ownProps = objectTypes[typeof iterable] && keys(iterable), | |
length = ownProps ? ownProps.length : 0; | |
while (++ownIndex < length) { | |
index = ownProps[ownIndex]; | |
if (typeof result[index] == 'undefined') result[index] = iterable[index]; | |
} | |
} | |
} | |
return result | |
}; | |
/** | |
* This method is similar to `_.find`, except that it returns the key of the | |
* element that passes the callback check, instead of the element itself. | |
* | |
* @static | |
* @memberOf _ | |
* @category Objects | |
* @param {Object} object The object to search. | |
* @param {Function|Object|String} [callback=identity] The function called per | |
* iteration. If a property name or object is passed, it will be used to create | |
* a "_.pluck" or "_.where" style callback, respectively. | |
* @param {Mixed} [thisArg] The `this` binding of `callback`. | |
* @returns {Mixed} Returns the key of the found element, else `undefined`. | |
* @example | |
* | |
* _.findKey({ 'a': 1, 'b': 2, 'c': 3, 'd': 4 }, function(num) { | |
* return num % 2 == 0; | |
* }); | |
* // => 'b' | |
*/ | |
function findKey(object, callback, thisArg) { | |
var result; | |
callback = lodash.createCallback(callback, thisArg); | |
forOwn(object, function(value, key, object) { | |
if (callback(value, key, object)) { | |
result = key; | |
return false; | |
} | |
}); | |
return result; | |
} | |
/** | |
* Iterates over `object`'s own and inherited enumerable properties, executing | |
* the `callback` for each property. The `callback` is bound to `thisArg` and | |
* invoked with three arguments; (value, key, object). Callbacks may exit iteration | |
* early by explicitly returning `false`. | |
* | |
* @static | |
* @memberOf _ | |
* @type Function | |
* @category Objects | |
* @param {Object} object The object to iterate over. | |
* @param {Function} [callback=identity] The function called per iteration. | |
* @param {Mixed} [thisArg] The `this` binding of `callback`. | |
* @returns {Object} Returns `object`. | |
* @example | |
* | |
* function Dog(name) { | |
* this.name = name; | |
* } | |
* | |
* Dog.prototype.bark = function() { | |
* alert('Woof, woof!'); | |
* }; | |
* | |
* _.forIn(new Dog('Dagny'), function(value, key) { | |
* alert(key); | |
* }); | |
* // => alerts 'name' and 'bark' (order is not guaranteed) | |
*/ | |
var forIn = function (collection, callback, thisArg) { | |
var index, iterable = collection, result = iterable; | |
if (!iterable) return result; | |
if (!objectTypes[typeof iterable]) return result; | |
callback = callback && typeof thisArg == 'undefined' ? callback : lodash.createCallback(callback, thisArg); | |
for (index in iterable) { | |
if (callback(iterable[index], index, collection) === false) return result; | |
} | |
return result | |
}; | |
/** | |
* Iterates over an object's own enumerable properties, executing the `callback` | |
* for each property. The `callback` is bound to `thisArg` and invoked with three | |
* arguments; (value, key, object). Callbacks may exit iteration early by explicitly | |
* returning `false`. | |
* | |
* @static | |
* @memberOf _ | |
* @type Function | |
* @category Objects | |
* @param {Object} object The object to iterate over. | |
* @param {Function} [callback=identity] The function called per iteration. | |
* @param {Mixed} [thisArg] The `this` binding of `callback`. | |
* @returns {Object} Returns `object`. | |
* @example | |
* | |
* _.forOwn({ '0': 'zero', '1': 'one', 'length': 2 }, function(num, key) { | |
* alert(key); | |
* }); | |
* // => alerts '0', '1', and 'length' (order is not guaranteed) | |
*/ | |
var forOwn = function (collection, callback, thisArg) { | |
var index, iterable = collection, result = iterable; | |
if (!iterable) return result; | |
if (!objectTypes[typeof iterable]) return result; | |
callback = callback && typeof thisArg == 'undefined' ? callback : lodash.createCallback(callback, thisArg); | |
var ownIndex = -1, | |
ownProps = objectTypes[typeof iterable] && keys(iterable), | |
length = ownProps ? ownProps.length : 0; | |
while (++ownIndex < length) { | |
index = ownProps[ownIndex]; | |
if (callback(iterable[index], index, collection) === false) return result; | |
} | |
return result | |
}; | |
/** | |
* Creates a sorted array of all enumerable properties, own and inherited, | |
* of `object` that have function values. | |
* | |
* @static | |
* @memberOf _ | |
* @alias methods | |
* @category Objects | |
* @param {Object} object The object to inspect. | |
* @returns {Array} Returns a new array of property names that have function values. | |
* @example | |
* | |
* _.functions(_); | |
* // => ['all', 'any', 'bind', 'bindAll', 'clone', 'compact', 'compose', ...] | |
*/ | |
function functions(object) { | |
var result = []; | |
forIn(object, function(value, key) { | |
if (isFunction(value)) { | |
result.push(key); | |
} | |
}); | |
return result.sort(); | |
} | |
/** | |
* Checks if the specified object `property` exists and is a direct property, | |
* instead of an inherited property. | |
* | |
* @static | |
* @memberOf _ | |
* @category Objects | |
* @param {Object} object The object to check. | |
* @param {String} property The property to check for. | |
* @returns {Boolean} Returns `true` if key is a direct property, else `false`. | |
* @example | |
* | |
* _.has({ 'a': 1, 'b': 2, 'c': 3 }, 'b'); | |
* // => true | |
*/ | |
function has(object, property) { | |
return object ? hasOwnProperty.call(object, property) : false; | |
} | |
/** | |
* Creates an object composed of the inverted keys and values of the given `object`. | |
* | |
* @static | |
* @memberOf _ | |
* @category Objects | |
* @param {Object} object The object to invert. | |
* @returns {Object} Returns the created inverted object. | |
* @example | |
* | |
* _.invert({ 'first': 'moe', 'second': 'larry' }); | |
* // => { 'moe': 'first', 'larry': 'second' } | |
*/ | |
function invert(object) { | |
var index = -1, | |
props = keys(object), | |
length = props.length, | |
result = {}; | |
while (++index < length) { | |
var key = props[index]; | |
result[object[key]] = key; | |
} | |
return result; | |
} | |
/** | |
* Checks if `value` is a boolean value. | |
* | |
* @static | |
* @memberOf _ | |
* @category Objects | |
* @param {Mixed} value The value to check. | |
* @returns {Boolean} Returns `true`, if the `value` is a boolean value, else `false`. | |
* @example | |
* | |
* _.isBoolean(null); | |
* // => false | |
*/ | |
function isBoolean(value) { | |
return value === true || value === false || toString.call(value) == boolClass; | |
} | |
/** | |
* Checks if `value` is a date. | |
* | |
* @static | |
* @memberOf _ | |
* @category Objects | |
* @param {Mixed} value The value to check. | |
* @returns {Boolean} Returns `true`, if the `value` is a date, else `false`. | |
* @example | |
* | |
* _.isDate(new Date); | |
* // => true | |
*/ | |
function isDate(value) { | |
return value ? (typeof value == 'object' && toString.call(value) == dateClass) : false; | |
} | |
/** | |
* Checks if `value` is a DOM element. | |
* | |
* @static | |
* @memberOf _ | |
* @category Objects | |
* @param {Mixed} value The value to check. | |
* @returns {Boolean} Returns `true`, if the `value` is a DOM element, else `false`. | |
* @example | |
* | |
* _.isElement(document.body); | |
* // => true | |
*/ | |
function isElement(value) { | |
return value ? value.nodeType === 1 : false; | |
} | |
/** | |
* Checks if `value` is empty. Arrays, strings, or `arguments` objects with a | |
* length of `0` and objects with no own enumerable properties are considered | |
* "empty". | |
* | |
* @static | |
* @memberOf _ | |
* @category Objects | |
* @param {Array|Object|String} value The value to inspect. | |
* @returns {Boolean} Returns `true`, if the `value` is empty, else `false`. | |
* @example | |
* | |
* _.isEmpty([1, 2, 3]); | |
* // => false | |
* | |
* _.isEmpty({}); | |
* // => true | |
* | |
* _.isEmpty(''); | |
* // => true | |
*/ | |
function isEmpty(value) { | |
var result = true; | |
if (!value) { | |
return result; | |
} | |
var className = toString.call(value), | |
length = value.length; | |
if ((className == arrayClass || className == stringClass || className == argsClass ) || | |
(className == objectClass && typeof length == 'number' && isFunction(value.splice))) { | |
return !length; | |
} | |
forOwn(value, function() { | |
return (result = false); | |
}); | |
return result; | |
} | |
/** | |
* Performs a deep comparison between two values to determine if they are | |
* equivalent to each other. If `callback` is passed, it will be executed to | |
* compare values. If `callback` returns `undefined`, comparisons will be handled | |
* by the method instead. The `callback` is bound to `thisArg` and invoked with | |
* two arguments; (a, b). | |
* | |
* @static | |
* @memberOf _ | |
* @category Objects | |
* @param {Mixed} a The value to compare. | |
* @param {Mixed} b The other value to compare. | |
* @param {Function} [callback] The function to customize comparing values. | |
* @param {Mixed} [thisArg] The `this` binding of `callback`. | |
* @param- {Array} [stackA=[]] Tracks traversed `a` objects. | |
* @param- {Array} [stackB=[]] Tracks traversed `b` objects. | |
* @returns {Boolean} Returns `true`, if the values are equivalent, else `false`. | |
* @example | |
* | |
* var moe = { 'name': 'moe', 'age': 40 }; | |
* var copy = { 'name': 'moe', 'age': 40 }; | |
* | |
* moe == copy; | |
* // => false | |
* | |
* _.isEqual(moe, copy); | |
* // => true | |
* | |
* var words = ['hello', 'goodbye']; | |
* var otherWords = ['hi', 'goodbye']; | |
* | |
* _.isEqual(words, otherWords, function(a, b) { | |
* var reGreet = /^(?:hello|hi)$/i, | |
* aGreet = _.isString(a) && reGreet.test(a), | |
* bGreet = _.isString(b) && reGreet.test(b); | |
* | |
* return (aGreet || bGreet) ? (aGreet == bGreet) : undefined; | |
* }); | |
* // => true | |
*/ | |
function isEqual(a, b, callback, thisArg, stackA, stackB) { | |
// used to indicate that when comparing objects, `a` has at least the properties of `b` | |
var whereIndicator = callback === indicatorObject; | |
if (typeof callback == 'function' && !whereIndicator) { | |
callback = lodash.createCallback(callback, thisArg, 2); | |
var result = callback(a, b); | |
if (typeof result != 'undefined') { | |
return !!result; | |
} | |
} | |
// exit early for identical values | |
if (a === b) { | |
// treat `+0` vs. `-0` as not equal | |
return a !== 0 || (1 / a == 1 / b); | |
} | |
var type = typeof a, | |
otherType = typeof b; | |
// exit early for unlike primitive values | |
if (a === a && | |
(!a || (type != 'function' && type != 'object')) && | |
(!b || (otherType != 'function' && otherType != 'object'))) { | |
return false; | |
} | |
// exit early for `null` and `undefined`, avoiding ES3's Function#call behavior | |
// http://es5.github.com/#x15.3.4.4 | |
if (a == null || b == null) { | |
return a === b; | |
} | |
// compare [[Class]] names | |
var className = toString.call(a), | |
otherClass = toString.call(b); | |
if (className == argsClass) { | |
className = objectClass; | |
} | |
if (otherClass == argsClass) { | |
otherClass = objectClass; | |
} | |
if (className != otherClass) { | |
return false; | |
} | |
switch (className) { | |
case boolClass: | |
case dateClass: | |
// coerce dates and booleans to numbers, dates to milliseconds and booleans | |
// to `1` or `0`, treating invalid dates coerced to `NaN` as not equal | |
return +a == +b; | |
case numberClass: | |
// treat `NaN` vs. `NaN` as equal | |
return (a != +a) | |
? b != +b | |
// but treat `+0` vs. `-0` as not equal | |
: (a == 0 ? (1 / a == 1 / b) : a == +b); | |
case regexpClass: | |
case stringClass: | |
// coerce regexes to strings (http://es5.github.com/#x15.10.6.4) | |
// treat string primitives and their corresponding object instances as equal | |
return a == String(b); | |
} | |
var isArr = className == arrayClass; | |
if (!isArr) { | |
// unwrap any `lodash` wrapped values | |
if (hasOwnProperty.call(a, '__wrapped__ ') || hasOwnProperty.call(b, '__wrapped__')) { | |
return isEqual(a.__wrapped__ || a, b.__wrapped__ || b, callback, thisArg, stackA, stackB); | |
} | |
// exit for functions and DOM nodes | |
if (className != objectClass) { | |
return false; | |
} | |
// in older versions of Opera, `arguments` objects have `Array` constructors | |
var ctorA = a.constructor, | |
ctorB = b.constructor; | |
// non `Object` object instances with different constructors are not equal | |
if (ctorA != ctorB && !( | |
isFunction(ctorA) && ctorA instanceof ctorA && | |
isFunction(ctorB) && ctorB instanceof ctorB | |
)) { | |
return false; | |
} | |
} | |
// assume cyclic structures are equal | |
// the algorithm for detecting cyclic structures is adapted from ES 5.1 | |
// section 15.12.3, abstract operation `JO` (http://es5.github.com/#x15.12.3) | |
var initedStack = !stackA; | |
stackA || (stackA = getArray()); | |
stackB || (stackB = getArray()); | |
var length = stackA.length; | |
while (length--) { | |
if (stackA[length] == a) { | |
return stackB[length] == b; | |
} | |
} | |
var size = 0; | |
result = true; | |
// add `a` and `b` to the stack of traversed objects | |
stackA.push(a); | |
stackB.push(b); | |
// recursively compare objects and arrays (susceptible to call stack limits) | |
if (isArr) { | |
length = a.length; | |
size = b.length; | |
// compare lengths to determine if a deep comparison is necessary | |
result = size == a.length; | |
if (!result && !whereIndicator) { | |
return result; | |
} | |
// deep compare the contents, ignoring non-numeric properties | |
while (size--) { | |
var index = length, | |
value = b[size]; | |
if (whereIndicator) { | |
while (index--) { | |
if ((result = isEqual(a[index], value, callback, thisArg, stackA, stackB))) { | |
break; | |
} | |
} | |
} else if (!(result = isEqual(a[size], value, callback, thisArg, stackA, stackB))) { | |
break; | |
} | |
} | |
return result; | |
} | |
// deep compare objects using `forIn`, instead of `forOwn`, to avoid `Object.keys` | |
// which, in this case, is more costly | |
forIn(b, function(value, key, b) { | |
if (hasOwnProperty.call(b, key)) { | |
// count the number of properties. | |
size++; | |
// deep compare each property value. | |
return (result = hasOwnProperty.call(a, key) && isEqual(a[key], value, callback, thisArg, stackA, stackB)); | |
} | |
}); | |
if (result && !whereIndicator) { | |
// ensure both objects have the same number of properties | |
forIn(a, function(value, key, a) { | |
if (hasOwnProperty.call(a, key)) { | |
// `size` will be `-1` if `a` has more properties than `b` | |
return (result = --size > -1); | |
} | |
}); | |
} | |
if (initedStack) { | |
releaseArray(stackA); | |
releaseArray(stackB); | |
} | |
return result; | |
} | |
/** | |
* Checks if `value` is, or can be coerced to, a finite number. | |
* | |
* Note: This is not the same as native `isFinite`, which will return true for | |
* booleans and empty strings. See http://es5.github.com/#x15.1.2.5. | |
* | |
* @static | |
* @memberOf _ | |
* @category Objects | |
* @param {Mixed} value The value to check. | |
* @returns {Boolean} Returns `true`, if the `value` is finite, else `false`. | |
* @example | |
* | |
* _.isFinite(-101); | |
* // => true | |
* | |
* _.isFinite('10'); | |
* // => true | |
* | |
* _.isFinite(true); | |
* // => false | |
* | |
* _.isFinite(''); | |
* // => false | |
* | |
* _.isFinite(Infinity); | |
* // => false | |
*/ | |
function isFinite(value) { | |
return nativeIsFinite(value) && !nativeIsNaN(parseFloat(value)); | |
} | |
/** | |
* Checks if `value` is a function. | |
* | |
* @static | |
* @memberOf _ | |
* @category Objects | |
* @param {Mixed} value The value to check. | |
* @returns {Boolean} Returns `true`, if the `value` is a function, else `false`. | |
* @example | |
* | |
* _.isFunction(_); | |
* // => true | |
*/ | |
function isFunction(value) { | |
return typeof value == 'function'; | |
} | |
/** | |
* Checks if `value` is the language type of Object. | |
* (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`) | |
* | |
* @static | |
* @memberOf _ | |
* @category Objects | |
* @param {Mixed} value The value to check. | |
* @returns {Boolean} Returns `true`, if the `value` is an object, else `false`. | |
* @example | |
* | |
* _.isObject({}); | |
* // => true | |
* | |
* _.isObject([1, 2, 3]); | |
* // => true | |
* | |
* _.isObject(1); | |
* // => false | |
*/ | |
function isObject(value) { | |
// check if the value is the ECMAScript language type of Object | |
// http://es5.github.com/#x8 | |
// and avoid a V8 bug | |
// http://code.google.com/p/v8/issues/detail?id=2291 | |
return !!(value && objectTypes[typeof value]); | |
} | |
/** | |
* Checks if `value` is `NaN`. | |
* | |
* Note: This is not the same as native `isNaN`, which will return `true` for | |
* `undefined` and other values. See http://es5.github.com/#x15.1.2.4. | |
* | |
* @static | |
* @memberOf _ | |
* @category Objects | |
* @param {Mixed} value The value to check. | |
* @returns {Boolean} Returns `true`, if the `value` is `NaN`, else `false`. | |
* @example | |
* | |
* _.isNaN(NaN); | |
* // => true | |
* | |
* _.isNaN(new Number(NaN)); | |
* // => true | |
* | |
* isNaN(undefined); | |
* // => true | |
* | |
* _.isNaN(undefined); | |
* // => false | |
*/ | |
function isNaN(value) { | |
// `NaN` as a primitive is the only value that is not equal to itself | |
// (perform the [[Class]] check first to avoid errors with some host objects in IE) | |
return isNumber(value) && value != +value | |
} | |
/** | |
* Checks if `value` is `null`. | |
* | |
* @static | |
* @memberOf _ | |
* @category Objects | |
* @param {Mixed} value The value to check. | |
* @returns {Boolean} Returns `true`, if the `value` is `null`, else `false`. | |
* @example | |
* | |
* _.isNull(null); | |
* // => true | |
* | |
* _.isNull(undefined); | |
* // => false | |
*/ | |
function isNull(value) { | |
return value === null; | |
} | |
/** | |
* Checks if `value` is a number. | |
* | |
* @static | |
* @memberOf _ | |
* @category Objects | |
* @param {Mixed} value The value to check. | |
* @returns {Boolean} Returns `true`, if the `value` is a number, else `false`. | |
* @example | |
* | |
* _.isNumber(8.4 * 5); | |
* // => true | |
*/ | |
function isNumber(value) { | |
return typeof value == 'number' || toString.call(value) == numberClass; | |
} | |
/** | |
* Checks if a given `value` is an object created by the `Object` constructor. | |
* | |
* @static | |
* @memberOf _ | |
* @category Objects | |
* @param {Mixed} value The value to check. | |
* @returns {Boolean} Returns `true`, if `value` is a plain object, else `false`. | |
* @example | |
* | |
* function Stooge(name, age) { | |
* this.name = name; | |
* this.age = age; | |
* } | |
* | |
* _.isPlainObject(new Stooge('moe', 40)); | |
* // => false | |
* | |
* _.isPlainObject([1, 2, 3]); | |
* // => false | |
* | |
* _.isPlainObject({ 'name': 'moe', 'age': 40 }); | |
* // => true | |
*/ | |
var isPlainObject = function(value) { | |
if (!(value && toString.call(value) == objectClass)) { | |
return false; | |
} | |
var valueOf = value.valueOf, | |
objProto = typeof valueOf == 'function' && (objProto = getPrototypeOf(valueOf)) && getPrototypeOf(objProto); | |
return objProto | |
? (value == objProto || getPrototypeOf(value) == objProto) | |
: shimIsPlainObject(value); | |
}; | |
/** | |
* Checks if `value` is a regular expression. | |
* | |
* @static | |
* @memberOf _ | |
* @category Objects | |
* @param {Mixed} value The value to check. | |
* @returns {Boolean} Returns `true`, if the `value` is a regular expression, else `false`. | |
* @example | |
* | |
* _.isRegExp(/moe/); | |
* // => true | |
*/ | |
function isRegExp(value) { | |
return value ? (typeof value == 'object' && toString.call(value) == regexpClass) : false; | |
} | |
/** | |
* Checks if `value` is a string. | |
* | |
* @static | |
* @memberOf _ | |
* @category Objects | |
* @param {Mixed} value The value to check. | |
* @returns {Boolean} Returns `true`, if the `value` is a string, else `false`. | |
* @example | |
* | |
* _.isString('moe'); | |
* // => true | |
*/ | |
function isString(value) { | |
return typeof value == 'string' || toString.call(value) == stringClass; | |
} | |
/** | |
* Checks if `value` is `undefined`. | |
* | |
* @static | |
* @memberOf _ | |
* @category Objects | |
* @param {Mixed} value The value to check. | |
* @returns {Boolean} Returns `true`, if the `value` is `undefined`, else `false`. | |
* @example | |
* | |
* _.isUndefined(void 0); | |
* // => true | |
*/ | |
function isUndefined(value) { | |
return typeof value == 'undefined'; | |
} | |
/** | |
* Recursively merges own enumerable properties of the source object(s), that | |
* don't resolve to `undefined`, into the destination object. Subsequent sources | |
* will overwrite property assignments of previous sources. If a `callback` function | |
* is passed, it will be executed to produce the merged values of the destination | |
* and source properties. If `callback` returns `undefined`, merging will be | |
* handled by the method instead. The `callback` is bound to `thisArg` and | |
* invoked with two arguments; (objectValue, sourceValue). | |
* | |
* @static | |
* @memberOf _ | |
* @category Objects | |
* @param {Object} object The destination object. | |
* @param {Object} [source1, source2, ...] The source objects. | |
* @param {Function} [callback] The function to customize merging properties. | |
* @param {Mixed} [thisArg] The `this` binding of `callback`. | |
* @param- {Object} [deepIndicator] Indicates that `stackA` and `stackB` are | |
* arrays of traversed objects, instead of source objects. | |
* @param- {Array} [stackA=[]] Tracks traversed source objects. | |
* @param- {Array} [stackB=[]] Associates values with source counterparts. | |
* @returns {Object} Returns the destination object. | |
* @example | |
* | |
* var names = { | |
* 'stooges': [ | |
* { 'name': 'moe' }, | |
* { 'name': 'larry' } | |
* ] | |
* }; | |
* | |
* var ages = { | |
* 'stooges': [ | |
* { 'age': 40 }, | |
* { 'age': 50 } | |
* ] | |
* }; | |
* | |
* _.merge(names, ages); | |
* // => { 'stooges': [{ 'name': 'moe', 'age': 40 }, { 'name': 'larry', 'age': 50 }] } | |
* | |
* var food = { | |
* 'fruits': ['apple'], | |
* 'vegetables': ['beet'] | |
* }; | |
* | |
* var otherFood = { | |
* 'fruits': ['banana'], | |
* 'vegetables': ['carrot'] | |
* }; | |
* | |
* _.merge(food, otherFood, function(a, b) { | |
* return _.isArray(a) ? a.concat(b) : undefined; | |
* }); | |
* // => { 'fruits': ['apple', 'banana'], 'vegetables': ['beet', 'carrot] } | |
*/ | |
function merge(object, source, deepIndicator) { | |
var args = arguments, | |
index = 0, | |
length = 2; | |
if (!isObject(object)) { | |
return object; | |
} | |
if (deepIndicator === indicatorObject) { | |
var callback = args[3], | |
stackA = args[4], | |
stackB = args[5]; | |
} else { | |
var initedStack = true; | |
stackA = getArray(); | |
stackB = getArray(); | |
// allows working with `_.reduce` and `_.reduceRight` without | |
// using their `callback` arguments, `index|key` and `collection` | |
if (typeof deepIndicator != 'number') { | |
length = args.length; | |
} | |
if (length > 3 && typeof args[length - 2] == 'function') { | |
callback = lodash.createCallback(args[--length - 1], args[length--], 2); | |
} else if (length > 2 && typeof args[length - 1] == 'function') { | |
callback = args[--length]; | |
} | |
} | |
while (++index < length) { | |
(isArray(args[index]) ? forEach : forOwn)(args[index], function(source, key) { | |
var found, | |
isArr, | |
result = source, | |
value = object[key]; | |
if (source && ((isArr = isArray(source)) || isPlainObject(source))) { | |
// avoid merging previously merged cyclic sources | |
var stackLength = stackA.length; | |
while (stackLength--) { | |
if ((found = stackA[stackLength] == source)) { | |
value = stackB[stackLength]; | |
break; | |
} | |
} | |
if (!found) { | |
var isShallow; | |
if (callback) { | |
result = callback(value, source); | |
if ((isShallow = typeof result != 'undefined')) { | |
value = result; | |
} | |
} | |
if (!isShallow) { | |
value = isArr | |
? (isArray(value) ? value : []) | |
: (isPlainObject(value) ? value : {}); | |
} | |
// add `source` and associated `value` to the stack of traversed objects | |
stackA.push(source); | |
stackB.push(value); | |
// recursively merge objects and arrays (susceptible to call stack limits) | |
if (!isShallow) { | |
value = merge(value, source, indicatorObject, callback, stackA, stackB); | |
} | |
} | |
} | |
else { | |
if (callback) { | |
result = callback(value, source); | |
if (typeof result == 'undefined') { | |
result = source; | |
} | |
} | |
if (typeof result != 'undefined') { | |
value = result; | |
} | |
} | |
object[key] = value; | |
}); | |
} | |
if (initedStack) { | |
releaseArray(stackA); | |
releaseArray(stackB); | |
} | |
return object; | |
} | |
/** | |
* Creates a shallow clone of `object` excluding the specified properties. | |
* Property names may be specified as individual arguments or as arrays of | |
* property names. If a `callback` function is passed, it will be executed | |
* for each property in the `object`, omitting the properties `callback` | |
* returns truthy for. The `callback` is bound to `thisArg` and invoked | |
* with three arguments; (value, key, object). | |
* | |
* @static | |
* @memberOf _ | |
* @category Objects | |
* @param {Object} object The source object. | |
* @param {Function|String} callback|[prop1, prop2, ...] The properties to omit | |
* or the function called per iteration. | |
* @param {Mixed} [thisArg] The `this` binding of `callback`. | |
* @returns {Object} Returns an object without the omitted properties. | |
* @example | |
* | |
* _.omit({ 'name': 'moe', 'age': 40 }, 'age'); | |
* // => { 'name': 'moe' } | |
* | |
* _.omit({ 'name': 'moe', 'age': 40 }, function(value) { | |
* return typeof value == 'number'; | |
* }); | |
* // => { 'name': 'moe' } | |
*/ | |
function omit(object, callback, thisArg) { | |
var indexOf = getIndexOf(), | |
isFunc = typeof callback == 'function', | |
result = {}; | |
if (isFunc) { | |
callback = lodash.createCallback(callback, thisArg); | |
} else { | |
var props = concat.apply(arrayRef, nativeSlice.call(arguments, 1)); | |
} | |
forIn(object, function(value, key, object) { | |
if (isFunc | |
? !callback(value, key, object) | |
: indexOf(props, key) < 0 | |
) { | |
result[key] = value; | |
} | |
}); | |
return result; | |
} | |
/** | |
* Creates a two dimensional array of the given object's key-value pairs, | |
* i.e. `[[key1, value1], [key2, value2]]`. | |
* | |
* @static | |
* @memberOf _ | |
* @category Objects | |
* @param {Object} object The object to inspect. | |
* @returns {Array} Returns new array of key-value pairs. | |
* @example | |
* | |
* _.pairs({ 'moe': 30, 'larry': 40 }); | |
* // => [['moe', 30], ['larry', 40]] (order is not guaranteed) | |
*/ | |
function pairs(object) { | |
var index = -1, | |
props = keys(object), | |
length = props.length, | |
result = Array(length); | |
while (++index < length) { | |
var key = props[index]; | |
result[index] = [key, object[key]]; | |
} | |
return result; | |
} | |
/** | |
* Creates a shallow clone of `object` composed of the specified properties. | |
* Property names may be specified as individual arguments or as arrays of property | |
* names. If `callback` is passed, it will be executed for each property in the | |
* `object`, picking the properties `callback` returns truthy for. The `callback` | |
* is bound to `thisArg` and invoked with three arguments; (value, key, object). | |
* | |
* @static | |
* @memberOf _ | |
* @category Objects | |
* @param {Object} object The source object. | |
* @param {Array|Function|String} callback|[prop1, prop2, ...] The function called | |
* per iteration or properties to pick, either as individual arguments or arrays. | |
* @param {Mixed} [thisArg] The `this` binding of `callback`. | |
* @returns {Object} Returns an object composed of the picked properties. | |
* @example | |
* | |
* _.pick({ 'name': 'moe', '_userid': 'moe1' }, 'name'); | |
* // => { 'name': 'moe' } | |
* | |
* _.pick({ 'name': 'moe', '_userid': 'moe1' }, function(value, key) { | |
* return key.charAt(0) != '_'; | |
* }); | |
* // => { 'name': 'moe' } | |
*/ | |
function pick(object, callback, thisArg) { | |
var result = {}; | |
if (typeof callback != 'function') { | |
var index = -1, | |
props = concat.apply(arrayRef, nativeSlice.call(arguments, 1)), | |
length = isObject(object) ? props.length : 0; | |
while (++index < length) { | |
var key = props[index]; | |
if (key in object) { | |
result[key] = object[key]; | |
} | |
} | |
} else { | |
callback = lodash.createCallback(callback, thisArg); | |
forIn(object, function(value, key, object) { | |
if (callback(value, key, object)) { | |
result[key] = value; | |
} | |
}); | |
} | |
return result; | |
} | |
/** | |
* An alternative to `_.reduce`, this method transforms an `object` to a new | |
* `accumulator` object which is the result of running each of its elements | |
* through the `callback`, with each `callback` execution potentially mutating | |
* the `accumulator` object. The `callback` is bound to `thisArg` and invoked | |
* with four arguments; (accumulator, value, key, object). Callbacks may exit | |
* iteration early by explicitly returning `false`. | |
* | |
* @static | |
* @memberOf _ | |
* @category Objects | |
* @param {Array|Object} collection The collection to iterate over. | |
* @param {Function} [callback=identity] The function called per iteration. | |
* @param {Mixed} [accumulator] The custom accumulator value. | |
* @param {Mixed} [thisArg] The `this` binding of `callback`. | |
* @returns {Mixed} Returns the accumulated value. | |
* @example | |
* | |
* var squares = _.transform([1, 2, 3, 4, 5, 6, 7, 8, 9, 10], function(result, num) { | |
* num *= num; | |
* if (num % 2) { | |
* return result.push(num) < 3; | |
* } | |
* }); | |
* // => [1, 9, 25] | |
* | |
* var mapped = _.transform({ 'a': 1, 'b': 2, 'c': 3 }, function(result, num, key) { | |
* result[key] = num * 3; | |
* }); | |
* // => { 'a': 3, 'b': 6, 'c': 9 } | |
*/ | |
function transform(object, callback, accumulator, thisArg) { | |
var isArr = isArray(object); | |
callback = lodash.createCallback(callback, thisArg, 4); | |
if (accumulator == null) { | |
if (isArr) { | |
accumulator = []; | |
} else { | |
var ctor = object && object.constructor, | |
proto = ctor && ctor.prototype; | |
accumulator = createObject(proto); | |
} | |
} | |
(isArr ? forEach : forOwn)(object, function(value, index, object) { | |
return callback(accumulator, value, index, object); | |
}); | |
return accumulator; | |
} | |
/** | |
* Creates an array composed of the own enumerable property values of `object`. | |
* | |
* @static | |
* @memberOf _ | |
* @category Objects | |
* @param {Object} object The object to inspect. | |
* @returns {Array} Returns a new array of property values. | |
* @example | |
* | |
* _.values({ 'one': 1, 'two': 2, 'three': 3 }); | |
* // => [1, 2, 3] (order is not guaranteed) | |
*/ | |
function values(object) { | |
var index = -1, | |
props = keys(object), | |
length = props.length, | |
result = Array(length); | |
while (++index < length) { | |
result[index] = object[props[index]]; | |
} | |
return result; | |
} | |
/*--------------------------------------------------------------------------*/ | |
/** | |
* Creates an array of elements from the specified indexes, or keys, of the | |
* `collection`. Indexes may be specified as individual arguments or as arrays | |
* of indexes. | |
* | |
* @static | |
* @memberOf _ | |
* @category Collections | |
* @param {Array|Object|String} collection The collection to iterate over. | |
* @param {Array|Number|String} [index1, index2, ...] The indexes of | |
* `collection` to retrieve, either as individual arguments or arrays. | |
* @returns {Array} Returns a new array of elements corresponding to the | |
* provided indexes. | |
* @example | |
* | |
* _.at(['a', 'b', 'c', 'd', 'e'], [0, 2, 4]); | |
* // => ['a', 'c', 'e'] | |
* | |
* _.at(['moe', 'larry', 'curly'], 0, 2); | |
* // => ['moe', 'curly'] | |
*/ | |
function at(collection) { | |
var index = -1, | |
props = concat.apply(arrayRef, nativeSlice.call(arguments, 1)), | |
length = props.length, | |
result = Array(length); | |
while(++index < length) { | |
result[index] = collection[props[index]]; | |
} | |
return result; | |
} | |
/** | |
* Checks if a given `target` element is present in a `collection` using strict | |
* equality for comparisons, i.e. `===`. If `fromIndex` is negative, it is used | |
* as the offset from the end of the collection. | |
* | |
* @static | |
* @memberOf _ | |
* @alias include | |
* @category Collections | |
* @param {Array|Object|String} collection The collection to iterate over. | |
* @param {Mixed} target The value to check for. | |
* @param {Number} [fromIndex=0] The index to search from. | |
* @returns {Boolean} Returns `true` if the `target` element is found, else `false`. | |
* @example | |
* | |
* _.contains([1, 2, 3], 1); | |
* // => true | |
* | |
* _.contains([1, 2, 3], 1, 2); | |
* // => false | |
* | |
* _.contains({ 'name': 'moe', 'age': 40 }, 'moe'); | |
* // => true | |
* | |
* _.contains('curly', 'ur'); | |
* // => true | |
*/ | |
function contains(collection, target, fromIndex) { | |
var index = -1, | |
indexOf = getIndexOf(), | |
length = collection ? collection.length : 0, | |
result = false; | |
fromIndex = (fromIndex < 0 ? nativeMax(0, length + fromIndex) : fromIndex) || 0; | |
if (length && typeof length == 'number') { | |
result = (isString(collection) | |
? collection.indexOf(target, fromIndex) | |
: indexOf(collection, target, fromIndex) | |
) > -1; | |
} else { | |
forOwn(collection, function(value) { | |
if (++index >= fromIndex) { | |
return !(result = value === target); | |
} | |
}); | |
} | |
return result; | |
} | |
/** | |
* Creates an object composed of keys returned from running each element of the | |
* `collection` through the given `callback`. The corresponding value of each key | |
* is the number of times the key was returned by the `callback`. The `callback` | |
* is bound to `thisArg` and invoked with three arguments; (value, index|key, collection). | |
* | |
* If a property name is passed for `callback`, the created "_.pluck" style | |
* callback will return the property value of the given element. | |
* | |
* If an object is passed for `callback`, the created "_.where" style callback | |
* will return `true` for elements that have the properties of the given object, | |
* else `false`. | |
* | |
* @static | |
* @memberOf _ | |
* @category Collections | |
* @param {Array|Object|String} collection The collection to iterate over. | |
* @param {Function|Object|String} [callback=identity] The function called per | |
* iteration. If a property name or object is passed, it will be used to create | |
* a "_.pluck" or "_.where" style callback, respectively. | |
* @param {Mixed} [thisArg] The `this` binding of `callback`. | |
* @returns {Object} Returns the composed aggregate object. | |
* @example | |
* | |
* _.countBy([4.3, 6.1, 6.4], function(num) { return Math.floor(num); }); | |
* // => { '4': 1, '6': 2 } | |
* | |
* _.countBy([4.3, 6.1, 6.4], function(num) { return this.floor(num); }, Math); | |
* // => { '4': 1, '6': 2 } | |
* | |
* _.countBy(['one', 'two', 'three'], 'length'); | |
* // => { '3': 2, '5': 1 } | |
*/ | |
function countBy(collection, callback, thisArg) { | |
var result = {}; | |
callback = lodash.createCallback(callback, thisArg); | |
forEach(collection, function(value, key, collection) { | |
key = String(callback(value, key, collection)); | |
(hasOwnProperty.call(result, key) ? result[key]++ : result[key] = 1); | |
}); | |
return result; | |
} | |
/** | |
* Checks if the `callback` returns a truthy value for **all** elements of a | |
* `collection`. The `callback` is bound to `thisArg` and invoked with three | |
* arguments; (value, index|key, collection). | |
* | |
* If a property name is passed for `callback`, the created "_.pluck" style | |
* callback will return the property value of the given element. | |
* | |
* If an object is passed for `callback`, the created "_.where" style callback | |
* will return `true` for elements that have the properties of the given object, | |
* else `false`. | |
* | |
* @static | |
* @memberOf _ | |
* @alias all | |
* @category Collections | |
* @param {Array|Object|String} collection The collection to iterate over. | |
* @param {Function|Object|String} [callback=identity] The function called per | |
* iteration. If a property name or object is passed, it will be used to create | |
* a "_.pluck" or "_.where" style callback, respectively. | |
* @param {Mixed} [thisArg] The `this` binding of `callback`. | |
* @returns {Boolean} Returns `true` if all elements pass the callback check, | |
* else `false`. | |
* @example | |
* | |
* _.every([true, 1, null, 'yes'], Boolean); | |
* // => false | |
* | |
* var stooges = [ | |
* { 'name': 'moe', 'age': 40 }, | |
* { 'name': 'larry', 'age': 50 } | |
* ]; | |
* | |
* // using "_.pluck" callback shorthand | |
* _.every(stooges, 'age'); | |
* // => true | |
* | |
* // using "_.where" callback shorthand | |
* _.every(stooges, { 'age': 50 }); | |
* // => false | |
*/ | |
function every(collection, callback, thisArg) { | |
var result = true; | |
callback = lodash.createCallback(callback, thisArg); | |
var index = -1, | |
length = collection ? collection.length : 0; | |
if (typeof length == 'number') { | |
while (++index < length) { | |
if (!(result = !!callback(collection[index], index, collection))) { | |
break; | |
} | |
} | |
} else { | |
forOwn(collection, function(value, index, collection) { | |
return (result = !!callback(value, index, collection)); | |
}); | |
} | |
return result; | |
} | |
/** | |
* Examines each element in a `collection`, returning an array of all elements | |
* the `callback` returns truthy for. The `callback` is bound to `thisArg` and | |
* invoked with three arguments; (value, index|key, collection). | |
* | |
* If a property name is passed for `callback`, the created "_.pluck" style | |
* callback will return the property value of the given element. | |
* | |
* If an object is passed for `callback`, the created "_.where" style callback | |
* will return `true` for elements that have the properties of the given object, | |
* else `false`. | |
* | |
* @static | |
* @memberOf _ | |
* @alias select | |
* @category Collections | |
* @param {Array|Object|String} collection The collection to iterate over. | |
* @param {Function|Object|String} [callback=identity] The function called per | |
* iteration. If a property name or object is passed, it will be used to create | |
* a "_.pluck" or "_.where" style callback, respectively. | |
* @param {Mixed} [thisArg] The `this` binding of `callback`. | |
* @returns {Array} Returns a new array of elements that passed the callback check. | |
* @example | |
* | |
* var evens = _.filter([1, 2, 3, 4, 5, 6], function(num) { return num % 2 == 0; }); | |
* // => [2, 4, 6] | |
* | |
* var food = [ | |
* { 'name': 'apple', 'organic': false, 'type': 'fruit' }, | |
* { 'name': 'carrot', 'organic': true, 'type': 'vegetable' } | |
* ]; | |
* | |
* // using "_.pluck" callback shorthand | |
* _.filter(food, 'organic'); | |
* // => [{ 'name': 'carrot', 'organic': true, 'type': 'vegetable' }] | |
* | |
* // using "_.where" callback shorthand | |
* _.filter(food, { 'type': 'fruit' }); | |
* // => [{ 'name': 'apple', 'organic': false, 'type': 'fruit' }] | |
*/ | |
function filter(collection, callback, thisArg) { | |
var result = []; | |
callback = lodash.createCallback(callback, thisArg); | |
var index = -1, | |
length = collection ? collection.length : 0; | |
if (typeof length == 'number') { | |
while (++index < length) { | |
var value = collection[index]; | |
if (callback(value, index, collection)) { | |
result.push(value); | |
} | |
} | |
} else { | |
forOwn(collection, function(value, index, collection) { | |
if (callback(value, index, collection)) { | |
result.push(value); | |
} | |
}); | |
} | |
return result; | |
} | |
/** | |
* Examines each element in a `collection`, returning the first that the `callback` | |
* returns truthy for. The `callback` is bound to `thisArg` and invoked with three | |
* arguments; (value, index|key, collection). | |
* | |
* If a property name is passed for `callback`, the created "_.pluck" style | |
* callback will return the property value of the given element. | |
* | |
* If an object is passed for `callback`, the created "_.where" style callback | |
* will return `true` for elements that have the properties of the given object, | |
* else `false`. | |
* | |
* @static | |
* @memberOf _ | |
* @alias detect, findWhere | |
* @category Collections | |
* @param {Array|Object|String} collection The collection to iterate over. | |
* @param {Function|Object|String} [callback=identity] The function called per | |
* iteration. If a property name or object is passed, it will be used to create | |
* a "_.pluck" or "_.where" style callback, respectively. | |
* @param {Mixed} [thisArg] The `this` binding of `callback`. | |
* @returns {Mixed} Returns the found element, else `undefined`. | |
* @example | |
* | |
* _.find([1, 2, 3, 4], function(num) { | |
* return num % 2 == 0; | |
* }); | |
* // => 2 | |
* | |
* var food = [ | |
* { 'name': 'apple', 'organic': false, 'type': 'fruit' }, | |
* { 'name': 'banana', 'organic': true, 'type': 'fruit' }, | |
* { 'name': 'beet', 'organic': false, 'type': 'vegetable' } | |
* ]; | |
* | |
* // using "_.where" callback shorthand | |
* _.find(food, { 'type': 'vegetable' }); | |
* // => { 'name': 'beet', 'organic': false, 'type': 'vegetable' } | |
* | |
* // using "_.pluck" callback shorthand | |
* _.find(food, 'organic'); | |
* // => { 'name': 'banana', 'organic': true, 'type': 'fruit' } | |
*/ | |
function find(collection, callback, thisArg) { | |
callback = lodash.createCallback(callback, thisArg); | |
var index = -1, | |
length = collection ? collection.length : 0; | |
if (typeof length == 'number') { | |
while (++index < length) { | |
var value = collection[index]; | |
if (callback(value, index, collection)) { | |
return value; | |
} | |
} | |
} else { | |
var result; | |
forOwn(collection, function(value, index, collection) { | |
if (callback(value, index, collection)) { | |
result = value; | |
return false; | |
} | |
}); | |
return result; | |
} | |
} | |
/** | |
* Iterates over a `collection`, executing the `callback` for each element in | |
* the `collection`. The `callback` is bound to `thisArg` and invoked with three | |
* arguments; (value, index|key, collection). Callbacks may exit iteration early | |
* by explicitly returning `false`. | |
* | |
* @static | |
* @memberOf _ | |
* @alias each | |
* @category Collections | |
* @param {Array|Object|String} collection The collection to iterate over. | |
* @param {Function} [callback=identity] The function called per iteration. | |
* @param {Mixed} [thisArg] The `this` binding of `callback`. | |
* @returns {Array|Object|String} Returns `collection`. | |
* @example | |
* | |
* _([1, 2, 3]).forEach(alert).join(','); | |
* // => alerts each number and returns '1,2,3' | |
* | |
* _.forEach({ 'one': 1, 'two': 2, 'three': 3 }, alert); | |
* // => alerts each number value (order is not guaranteed) | |
*/ | |
function forEach(collection, callback, thisArg) { | |
var index = -1, | |
length = collection ? collection.length : 0; | |
callback = callback && typeof thisArg == 'undefined' ? callback : lodash.createCallback(callback, thisArg); | |
if (typeof length == 'number') { | |
while (++index < length) { | |
if (callback(collection[index], index, collection) === false) { | |
break; | |
} | |
} | |
} else { | |
forOwn(collection, callback); | |
} | |
return collection; | |
} | |
/** | |
* Creates an object composed of keys returned from running each element of the | |
* `collection` through the `callback`. The corresponding value of each key is | |
* an array of elements passed to `callback` that returned the key. The `callback` | |
* is bound to `thisArg` and invoked with three arguments; (value, index|key, collection). | |
* | |
* If a property name is passed for `callback`, the created "_.pluck" style | |
* callback will return the property value of the given element. | |
* | |
* If an object is passed for `callback`, the created "_.where" style callback | |
* will return `true` for elements that have the properties of the given object, | |
* else `false` | |
* | |
* @static | |
* @memberOf _ | |
* @category Collections | |
* @param {Array|Object|String} collection The collection to iterate over. | |
* @param {Function|Object|String} [callback=identity] The function called per | |
* iteration. If a property name or object is passed, it will be used to create | |
* a "_.pluck" or "_.where" style callback, respectively. | |
* @param {Mixed} [thisArg] The `this` binding of `callback`. | |
* @returns {Object} Returns the composed aggregate object. | |
* @example | |
* | |
* _.groupBy([4.2, 6.1, 6.4], function(num) { return Math.floor(num); }); | |
* // => { '4': [4.2], '6': [6.1, 6.4] } | |
* | |
* _.groupBy([4.2, 6.1, 6.4], function(num) { return this.floor(num); }, Math); | |
* // => { '4': [4.2], '6': [6.1, 6.4] } | |
* | |
* // using "_.pluck" callback shorthand | |
* _.groupBy(['one', 'two', 'three'], 'length'); | |
* // => { '3': ['one', 'two'], '5': ['three'] } | |
*/ | |
function groupBy(collection, callback, thisArg) { | |
var result = {}; | |
callback = lodash.createCallback(callback, thisArg); | |
forEach(collection, function(value, key, collection) { | |
key = String(callback(value, key, collection)); | |
(hasOwnProperty.call(result, key) ? result[key] : result[key] = []).push(value); | |
}); | |
return result; | |
} | |
/** | |
* Invokes the method named by `methodName` on each element in the `collection`, | |
* returning an array of the results of each invoked method. Additional arguments | |
* will be passed to each invoked method. If `methodName` is a function, it will | |
* be invoked for, and `this` bound to, each element in the `collection`. | |
* | |
* @static | |
* @memberOf _ | |
* @category Collections | |
* @param {Array|Object|String} collection The collection to iterate over. | |
* @param {Function|String} methodName The name of the method to invoke or | |
* the function invoked per iteration. | |
* @param {Mixed} [arg1, arg2, ...] Arguments to invoke the method with. | |
* @returns {Array} Returns a new array of the results of each invoked method. | |
* @example | |
* | |
* _.invoke([[5, 1, 7], [3, 2, 1]], 'sort'); | |
* // => [[1, 5, 7], [1, 2, 3]] | |
* | |
* _.invoke([123, 456], String.prototype.split, ''); | |
* // => [['1', '2', '3'], ['4', '5', '6']] | |
*/ | |
function invoke(collection, methodName) { | |
var args = nativeSlice.call(arguments, 2), | |
index = -1, | |
isFunc = typeof methodName == 'function', | |
length = collection ? collection.length : 0, | |
result = Array(typeof length == 'number' ? length : 0); | |
forEach(collection, function(value) { | |
result[++index] = (isFunc ? methodName : value[methodName]).apply(value, args); | |
}); | |
return result; | |
} | |
/** | |
* Creates an array of values by running each element in the `collection` | |
* through the `callback`. The `callback` is bound to `thisArg` and invoked with | |
* three arguments; (value, index|key, collection). | |
* | |
* If a property name is passed for `callback`, the created "_.pluck" style | |
* callback will return the property value of the given element. | |
* | |
* If an object is passed for `callback`, the created "_.where" style callback | |
* will return `true` for elements that have the properties of the given object, | |
* else `false`. | |
* | |
* @static | |
* @memberOf _ | |
* @alias collect | |
* @category Collections | |
* @param {Array|Object|String} collection The collection to iterate over. | |
* @param {Function|Object|String} [callback=identity] The function called per | |
* iteration. If a property name or object is passed, it will be used to create | |
* a "_.pluck" or "_.where" style callback, respectively. | |
* @param {Mixed} [thisArg] The `this` binding of `callback`. | |
* @returns {Array} Returns a new array of the results of each `callback` execution. | |
* @example | |
* | |
* _.map([1, 2, 3], function(num) { return num * 3; }); | |
* // => [3, 6, 9] | |
* | |
* _.map({ 'one': 1, 'two': 2, 'three': 3 }, function(num) { return num * 3; }); | |
* // => [3, 6, 9] (order is not guaranteed) | |
* | |
* var stooges = [ | |
* { 'name': 'moe', 'age': 40 }, | |
* { 'name': 'larry', 'age': 50 } | |
* ]; | |
* | |
* // using "_.pluck" callback shorthand | |
* _.map(stooges, 'name'); | |
* // => ['moe', 'larry'] | |
*/ | |
function map(collection, callback, thisArg) { | |
var index = -1, | |
length = collection ? collection.length : 0; | |
callback = lodash.createCallback(callback, thisArg); | |
if (typeof length == 'number') { | |
var result = Array(length); | |
while (++index < length) { | |
result[index] = callback(collection[index], index, collection); | |
} | |
} else { | |
result = []; | |
forOwn(collection, function(value, key, collection) { | |
result[++index] = callback(value, key, collection); | |
}); | |
} | |
return result; | |
} | |
/** | |
* Retrieves the maximum value of an `array`. If `callback` is passed, | |
* it will be executed for each value in the `array` to generate the | |
* criterion by which the value is ranked. The `callback` is bound to | |
* `thisArg` and invoked with three arguments; (value, index, collection). | |
* | |
* If a property name is passed for `callback`, the created "_.pluck" style | |
* callback will return the property value of the given element. | |
* | |
* If an object is passed for `callback`, the created "_.where" style callback | |
* will return `true` for elements that have the properties of the given object, | |
* else `false`. | |
* | |
* @static | |
* @memberOf _ | |
* @category Collections | |
* @param {Array|Object|String} collection The collection to iterate over. | |
* @param {Function|Object|String} [callback=identity] The function called per | |
* iteration. If a property name or object is passed, it will be used to create | |
* a "_.pluck" or "_.where" style callback, respectively. | |
* @param {Mixed} [thisArg] The `this` binding of `callback`. | |
* @returns {Mixed} Returns the maximum value. | |
* @example | |
* | |
* _.max([4, 2, 8, 6]); | |
* // => 8 | |
* | |
* var stooges = [ | |
* { 'name': 'moe', 'age': 40 }, | |
* { 'name': 'larry', 'age': 50 } | |
* ]; | |
* | |
* _.max(stooges, function(stooge) { return stooge.age; }); | |
* // => { 'name': 'larry', 'age': 50 }; | |
* | |
* // using "_.pluck" callback shorthand | |
* _.max(stooges, 'age'); | |
* // => { 'name': 'larry', 'age': 50 }; | |
*/ | |
function max(collection, callback, thisArg) { | |
var computed = -Infinity, | |
result = computed; | |
if (!callback && isArray(collection)) { | |
var index = -1, | |
length = collection.length; | |
while (++index < length) { | |
var value = collection[index]; | |
if (value > result) { | |
result = value; | |
} | |
} | |
} else { | |
callback = (!callback && isString(collection)) | |
? charAtCallback | |
: lodash.createCallback(callback, thisArg); | |
forEach(collection, function(value, index, collection) { | |
var current = callback(value, index, collection); | |
if (current > computed) { | |
computed = current; | |
result = value; | |
} | |
}); | |
} | |
return result; | |
} | |
/** | |
* Retrieves the minimum value of an `array`. If `callback` is passed, | |
* it will be executed for each value in the `array` to generate the | |
* criterion by which the value is ranked. The `callback` is bound to `thisArg` | |
* and invoked with three arguments; (value, index, collection). | |
* | |
* If a property name is passed for `callback`, the created "_.pluck" style | |
* callback will return the property value of the given element. | |
* | |
* If an object is passed for `callback`, the created "_.where" style callback | |
* will return `true` for elements that have the properties of the given object, | |
* else `false`. | |
* | |
* @static | |
* @memberOf _ | |
* @category Collections | |
* @param {Array|Object|String} collection The collection to iterate over. | |
* @param {Function|Object|String} [callback=identity] The function called per | |
* iteration. If a property name or object is passed, it will be used to create | |
* a "_.pluck" or "_.where" style callback, respectively. | |
* @param {Mixed} [thisArg] The `this` binding of `callback`. | |
* @returns {Mixed} Returns the minimum value. | |
* @example | |
* | |
* _.min([4, 2, 8, 6]); | |
* // => 2 | |
* | |
* var stooges = [ | |
* { 'name': 'moe', 'age': 40 }, | |
* { 'name': 'larry', 'age': 50 } | |
* ]; | |
* | |
* _.min(stooges, function(stooge) { return stooge.age; }); | |
* // => { 'name': 'moe', 'age': 40 }; | |
* | |
* // using "_.pluck" callback shorthand | |
* _.min(stooges, 'age'); | |
* // => { 'name': 'moe', 'age': 40 }; | |
*/ | |
function min(collection, callback, thisArg) { | |
var computed = Infinity, | |
result = computed; | |
if (!callback && isArray(collection)) { | |
var index = -1, | |
length = collection.length; | |
while (++index < length) { | |
var value = collection[index]; | |
if (value < result) { | |
result = value; | |
} | |
} | |
} else { | |
callback = (!callback && isString(collection)) | |
? charAtCallback | |
: lodash.createCallback(callback, thisArg); | |
forEach(collection, function(value, index, collection) { | |
var current = callback(value, index, collection); | |
if (current < computed) { | |
computed = current; | |
result = value; | |
} | |
}); | |
} | |
return result; | |
} | |
/** | |
* Retrieves the value of a specified property from all elements in the `collection`. | |
* | |
* @static | |
* @memberOf _ | |
* @type Function | |
* @category Collections | |
* @param {Array|Object|String} collection The collection to iterate over. | |
* @param {String} property The property to pluck. | |
* @returns {Array} Returns a new array of property values. | |
* @example | |
* | |
* var stooges = [ | |
* { 'name': 'moe', 'age': 40 }, | |
* { 'name': 'larry', 'age': 50 } | |
* ]; | |
* | |
* _.pluck(stooges, 'name'); | |
* // => ['moe', 'larry'] | |
*/ | |
function pluck(collection, property) { | |
var index = -1, | |
length = collection ? collection.length : 0; | |
if (typeof length == 'number') { | |
var result = Array(length); | |
while (++index < length) { | |
result[index] = collection[index][property]; | |
} | |
} | |
return result || map(collection, property); | |
} | |
/** | |
* Reduces a `collection` to a value which is the accumulated result of running | |
* each element in the `collection` through the `callback`, where each successive | |
* `callback` execution consumes the return value of the previous execution. | |
* If `accumulator` is not passed, the first element of the `collection` will be | |
* used as the initial `accumulator` value. The `callback` is bound to `thisArg` | |
* and invoked with four arguments; (accumulator, value, index|key, collection). | |
* | |
* @static | |
* @memberOf _ | |
* @alias foldl, inject | |
* @category Collections | |
* @param {Array|Object|String} collection The collection to iterate over. | |
* @param {Function} [callback=identity] The function called per iteration. | |
* @param {Mixed} [accumulator] Initial value of the accumulator. | |
* @param {Mixed} [thisArg] The `this` binding of `callback`. | |
* @returns {Mixed} Returns the accumulated value. | |
* @example | |
* | |
* var sum = _.reduce([1, 2, 3], function(sum, num) { | |
* return sum + num; | |
* }); | |
* // => 6 | |
* | |
* var mapped = _.reduce({ 'a': 1, 'b': 2, 'c': 3 }, function(result, num, key) { | |
* result[key] = num * 3; | |
* return result; | |
* }, {}); | |
* // => { 'a': 3, 'b': 6, 'c': 9 } | |
*/ | |
function reduce(collection, callback, accumulator, thisArg) { | |
if (!collection) return accumulator; | |
var noaccum = arguments.length < 3; | |
callback = lodash.createCallback(callback, thisArg, 4); | |
var index = -1, | |
length = collection.length; | |
if (typeof length == 'number') { | |
if (noaccum) { | |
accumulator = collection[++index]; | |
} | |
while (++index < length) { | |
accumulator = callback(accumulator, collection[index], index, collection); | |
} | |
} else { | |
forOwn(collection, function(value, index, collection) { | |
accumulator = noaccum | |
? (noaccum = false, value) | |
: callback(accumulator, value, index, collection) | |
}); | |
} | |
return accumulator; | |
} | |
/** | |
* This method is similar to `_.reduce`, except that it iterates over a | |
* `collection` from right to left. | |
* | |
* @static | |
* @memberOf _ | |
* @alias foldr | |
* @category Collections | |
* @param {Array|Object|String} collection The collection to iterate over. | |
* @param {Function} [callback=identity] The function called per iteration. | |
* @param {Mixed} [accumulator] Initial value of the accumulator. | |
* @param {Mixed} [thisArg] The `this` binding of `callback`. | |
* @returns {Mixed} Returns the accumulated value. | |
* @example | |
* | |
* var list = [[0, 1], [2, 3], [4, 5]]; | |
* var flat = _.reduceRight(list, function(a, b) { return a.concat(b); }, []); | |
* // => [4, 5, 2, 3, 0, 1] | |
*/ | |
function reduceRight(collection, callback, accumulator, thisArg) { | |
var iterable = collection, | |
length = collection ? collection.length : 0, | |
noaccum = arguments.length < 3; | |
if (typeof length != 'number') { | |
var props = keys(collection); | |
length = props.length; | |
} | |
callback = lodash.createCallback(callback, thisArg, 4); | |
forEach(collection, function(value, index, collection) { | |
index = props ? props[--length] : --length; | |
accumulator = noaccum | |
? (noaccum = false, iterable[index]) | |
: callback(accumulator, iterable[index], index, collection); | |
}); | |
return accumulator; | |
} | |
/** | |
* The opposite of `_.filter`, this method returns the elements of a | |
* `collection` that `callback` does **not** return truthy for. | |
* | |
* If a property name is passed for `callback`, the created "_.pluck" style | |
* callback will return the property value of the given element. | |
* | |
* If an object is passed for `callback`, the created "_.where" style callback | |
* will return `true` for elements that have the properties of the given object, | |
* else `false`. | |
* | |
* @static | |
* @memberOf _ | |
* @category Collections | |
* @param {Array|Object|String} collection The collection to iterate over. | |
* @param {Function|Object|String} [callback=identity] The function called per | |
* iteration. If a property name or object is passed, it will be used to create | |
* a "_.pluck" or "_.where" style callback, respectively. | |
* @param {Mixed} [thisArg] The `this` binding of `callback`. | |
* @returns {Array} Returns a new array of elements that did **not** pass the | |
* callback check. | |
* @example | |
* | |
* var odds = _.reject([1, 2, 3, 4, 5, 6], function(num) { return num % 2 == 0; }); | |
* // => [1, 3, 5] | |
* | |
* var food = [ | |
* { 'name': 'apple', 'organic': false, 'type': 'fruit' }, | |
* { 'name': 'carrot', 'organic': true, 'type': 'vegetable' } | |
* ]; | |
* | |
* // using "_.pluck" callback shorthand | |
* _.reject(food, 'organic'); | |
* // => [{ 'name': 'apple', 'organic': false, 'type': 'fruit' }] | |
* | |
* // using "_.where" callback shorthand | |
* _.reject(food, { 'type': 'fruit' }); | |
* // => [{ 'name': 'carrot', 'organic': true, 'type': 'vegetable' }] | |
*/ | |
function reject(collection, callback, thisArg) { | |
callback = lodash.createCallback(callback, thisArg); | |
return filter(collection, function(value, index, collection) { | |
return !callback(value, index, collection); | |
}); | |
} | |
/** | |
* Creates an array of shuffled `array` values, using a version of the | |
* Fisher-Yates shuffle. See http://en.wikipedia.org/wiki/Fisher-Yates_shuffle. | |
* | |
* @static | |
* @memberOf _ | |
* @category Collections | |
* @param {Array|Object|String} collection The collection to shuffle. | |
* @returns {Array} Returns a new shuffled collection. | |
* @example | |
* | |
* _.shuffle([1, 2, 3, 4, 5, 6]); | |
* // => [4, 1, 6, 3, 5, 2] | |
*/ | |
function shuffle(collection) { | |
var index = -1, | |
length = collection ? collection.length : 0, | |
result = Array(typeof length == 'number' ? length : 0); | |
forEach(collection, function(value) { | |
var rand = floor(nativeRandom() * (++index + 1)); | |
result[index] = result[rand]; | |
result[rand] = value; | |
}); | |
return result; | |
} | |
/** | |
* Gets the size of the `collection` by returning `collection.length` for arrays | |
* and array-like objects or the number of own enumerable properties for objects. | |
* | |
* @static | |
* @memberOf _ | |
* @category Collections | |
* @param {Array|Object|String} collection The collection to inspect. | |
* @returns {Number} Returns `collection.length` or number of own enumerable properties. | |
* @example | |
* | |
* _.size([1, 2]); | |
* // => 2 | |
* | |
* _.size({ 'one': 1, 'two': 2, 'three': 3 }); | |
* // => 3 | |
* | |
* _.size('curly'); | |
* // => 5 | |
*/ | |
function size(collection) { | |
var length = collection ? collection.length : 0; | |
return typeof length == 'number' ? length : keys(collection).length; | |
} | |
/** | |
* Checks if the `callback` returns a truthy value for **any** element of a | |
* `collection`. The function returns as soon as it finds passing value, and | |
* does not iterate over the entire `collection`. The `callback` is bound to | |
* `thisArg` and invoked with three arguments; (value, index|key, collection). | |
* | |
* If a property name is passed for `callback`, the created "_.pluck" style | |
* callback will return the property value of the given element. | |
* | |
* If an object is passed for `callback`, the created "_.where" style callback | |
* will return `true` for elements that have the properties of the given object, | |
* else `false`. | |
* | |
* @static | |
* @memberOf _ | |
* @alias any | |
* @category Collections | |
* @param {Array|Object|String} collection The collection to iterate over. | |
* @param {Function|Object|String} [callback=identity] The function called per | |
* iteration. If a property name or object is passed, it will be used to create | |
* a "_.pluck" or "_.where" style callback, respectively. | |
* @param {Mixed} [thisArg] The `this` binding of `callback`. | |
* @returns {Boolean} Returns `true` if any element passes the callback check, | |
* else `false`. | |
* @example | |
* | |
* _.some([null, 0, 'yes', false], Boolean); | |
* // => true | |
* | |
* var food = [ | |
* { 'name': 'apple', 'organic': false, 'type': 'fruit' }, | |
* { 'name': 'carrot', 'organic': true, 'type': 'vegetable' } | |
* ]; | |
* | |
* // using "_.pluck" callback shorthand | |
* _.some(food, 'organic'); | |
* // => true | |
* | |
* // using "_.where" callback shorthand | |
* _.some(food, { 'type': 'meat' }); | |
* // => false | |
*/ | |
function some(collection, callback, thisArg) { | |
var result; | |
callback = lodash.createCallback(callback, thisArg); | |
var index = -1, | |
length = collection ? collection.length : 0; | |
if (typeof length == 'number') { | |
while (++index < length) { | |
if ((result = callback(collection[index], index, collection))) { | |
break; | |
} | |
} | |
} else { | |
forOwn(collection, function(value, index, collection) { | |
return !(result = callback(value, index, collection)); | |
}); | |
} | |
return !!result; | |
} | |
/** | |
* Creates an array of elements, sorted in ascending order by the results of | |
* running each element in the `collection` through the `callback`. This method | |
* performs a stable sort, that is, it will preserve the original sort order of | |
* equal elements. The `callback` is bound to `thisArg` and invoked with three | |
* arguments; (value, index|key, collection). | |
* | |
* If a property name is passed for `callback`, the created "_.pluck" style | |
* callback will return the property value of the given element. | |
* | |
* If an object is passed for `callback`, the created "_.where" style callback | |
* will return `true` for elements that have the properties of the given object, | |
* else `false`. | |
* | |
* @static | |
* @memberOf _ | |
* @category Collections | |
* @param {Array|Object|String} collection The collection to iterate over. | |
* @param {Function|Object|String} [callback=identity] The function called per | |
* iteration. If a property name or object is passed, it will be used to create | |
* a "_.pluck" or "_.where" style callback, respectively. | |
* @param {Mixed} [thisArg] The `this` binding of `callback`. | |
* @returns {Array} Returns a new array of sorted elements. | |
* @example | |
* | |
* _.sortBy([1, 2, 3], function(num) { return Math.sin(num); }); | |
* // => [3, 1, 2] | |
* | |
* _.sortBy([1, 2, 3], function(num) { return this.sin(num); }, Math); | |
* // => [3, 1, 2] | |
* | |
* // using "_.pluck" callback shorthand | |
* _.sortBy(['banana', 'strawberry', 'apple'], 'length'); | |
* // => ['apple', 'banana', 'strawberry'] | |
*/ | |
function sortBy(collection, callback, thisArg) { | |
var index = -1, | |
length = collection ? collection.length : 0, | |
result = Array(typeof length == 'number' ? length : 0); | |
callback = lodash.createCallback(callback, thisArg); | |
forEach(collection, function(value, key, collection) { | |
var object = result[++index] = getObject(); | |
object.criteria = callback(value, key, collection); | |
object.index = index; | |
object.value = value; | |
}); | |
length = result.length; | |
result.sort(compareAscending); | |
while (length--) { | |
var object = result[length]; | |
result[length] = object.value; | |
releaseObject(object); | |
} | |
return result; | |
} | |
/** | |
* Converts the `collection` to an array. | |
* | |
* @static | |
* @memberOf _ | |
* @category Collections | |
* @param {Array|Object|String} collection The collection to convert. | |
* @returns {Array} Returns the new converted array. | |
* @example | |
* | |
* (function() { return _.toArray(arguments).slice(1); })(1, 2, 3, 4); | |
* // => [2, 3, 4] | |
*/ | |
function toArray(collection) { | |
if (collection && typeof collection.length == 'number') { | |
return slice(collection); | |
} | |
return values(collection); | |
} | |
/** | |
* Examines each element in a `collection`, returning an array of all elements | |
* that have the given `properties`. When checking `properties`, this method | |
* performs a deep comparison between values to determine if they are equivalent | |
* to each other. | |
* | |
* @static | |
* @memberOf _ | |
* @type Function | |
* @category Collections | |
* @param {Array|Object|String} collection The collection to iterate over. | |
* @param {Object} properties The object of property values to filter by. | |
* @returns {Array} Returns a new array of elements that have the given `properties`. | |
* @example | |
* | |
* var stooges = [ | |
* { 'name': 'moe', 'age': 40 }, | |
* { 'name': 'larry', 'age': 50 } | |
* ]; | |
* | |
* _.where(stooges, { 'age': 40 }); | |
* // => [{ 'name': 'moe', 'age': 40 }] | |
*/ | |
var where = filter; | |
/*--------------------------------------------------------------------------*/ | |
/** | |
* Creates an array with all falsey values of `array` removed. The values | |
* `false`, `null`, `0`, `""`, `undefined` and `NaN` are all falsey. | |
* | |
* @static | |
* @memberOf _ | |
* @category Arrays | |
* @param {Array} array The array to compact. | |
* @returns {Array} Returns a new filtered array. | |
* @example | |
* | |
* _.compact([0, 1, false, 2, '', 3]); | |
* // => [1, 2, 3] | |
*/ | |
function compact(array) { | |
var index = -1, | |
length = array ? array.length : 0, | |
result = []; | |
while (++index < length) { | |
var value = array[index]; | |
if (value) { | |
result.push(value); | |
} | |
} | |
return result; | |
} | |
/** | |
* Creates an array of `array` elements not present in the other arrays | |
* using strict equality for comparisons, i.e. `===`. | |
* | |
* @static | |
* @memberOf _ | |
* @category Arrays | |
* @param {Array} array The array to process. | |
* @param {Array} [array1, array2, ...] Arrays to check. | |
* @returns {Array} Returns a new array of `array` elements not present in the | |
* other arrays. | |
* @example | |
* | |
* _.difference([1, 2, 3, 4, 5], [5, 2, 10]); | |
* // => [1, 3, 4] | |
*/ | |
function difference(array) { | |
var index = -1, | |
indexOf = getIndexOf(), | |
length = array ? array.length : 0, | |
seen = concat.apply(arrayRef, nativeSlice.call(arguments, 1)), | |
result = []; | |
var isLarge = length >= largeArraySize && indexOf === basicIndexOf; | |
if (isLarge) { | |
var cache = createCache(seen); | |
if (cache) { | |
indexOf = cacheIndexOf; | |
seen = cache; | |
} else { | |
isLarge = false; | |
} | |
} | |
while (++index < length) { | |
var value = array[index]; | |
if (indexOf(seen, value) < 0) { | |
result.push(value); | |
} | |
} | |
if (isLarge) { | |
releaseObject(seen); | |
} | |
return result; | |
} | |
/** | |
* This method is similar to `_.find`, except that it returns the index of | |
* the element that passes the callback check, instead of the element itself. | |
* | |
* @static | |
* @memberOf _ | |
* @category Arrays | |
* @param {Array} array The array to search. | |
* @param {Function|Object|String} [callback=identity] The function called per | |
* iteration. If a property name or object is passed, it will be used to create | |
* a "_.pluck" or "_.where" style callback, respectively. | |
* @param {Mixed} [thisArg] The `this` binding of `callback`. | |
* @returns {Mixed} Returns the index of the found element, else `-1`. | |
* @example | |
* | |
* _.findIndex(['apple', 'banana', 'beet'], function(food) { | |
* return /^b/.test(food); | |
* }); | |
* // => 1 | |
*/ | |
function findIndex(array, callback, thisArg) { | |
var index = -1, | |
length = array ? array.length : 0; | |
callback = lodash.createCallback(callback, thisArg); | |
while (++index < length) { | |
if (callback(array[index], index, array)) { | |
return index; | |
} | |
} | |
return -1; | |
} | |
/** | |
* Gets the first element of the `array`. If a number `n` is passed, the first | |
* `n` elements of the `array` are returned. If a `callback` function is passed, | |
* elements at the beginning of the array are returned as long as the `callback` | |
* returns truthy. The `callback` is bound to `thisArg` and invoked with three | |
* arguments; (value, index, array). | |
* | |
* If a property name is passed for `callback`, the created "_.pluck" style | |
* callback will return the property value of the given element. | |
* | |
* If an object is passed for `callback`, the created "_.where" style callback | |
* will return `true` for elements that have the properties of the given object, | |
* else `false`. | |
* | |
* @static | |
* @memberOf _ | |
* @alias head, take | |
* @category Arrays | |
* @param {Array} array The array to query. | |
* @param {Function|Object|Number|String} [callback|n] The function called | |
* per element or the number of elements to return. If a property name or | |
* object is passed, it will be used to create a "_.pluck" or "_.where" | |
* style callback, respectively. | |
* @param {Mixed} [thisArg] The `this` binding of `callback`. | |
* @returns {Mixed} Returns the first element(s) of `array`. | |
* @example | |
* | |
* _.first([1, 2, 3]); | |
* // => 1 | |
* | |
* _.first([1, 2, 3], 2); | |
* // => [1, 2] | |
* | |
* _.first([1, 2, 3], function(num) { | |
* return num < 3; | |
* }); | |
* // => [1, 2] | |
* | |
* var food = [ | |
* { 'name': 'banana', 'organic': true }, | |
* { 'name': 'beet', 'organic': false }, | |
* ]; | |
* | |
* // using "_.pluck" callback shorthand | |
* _.first(food, 'organic'); | |
* // => [{ 'name': 'banana', 'organic': true }] | |
* | |
* var food = [ | |
* { 'name': 'apple', 'type': 'fruit' }, | |
* { 'name': 'banana', 'type': 'fruit' }, | |
* { 'name': 'beet', 'type': 'vegetable' } | |
* ]; | |
* | |
* // using "_.where" callback shorthand | |
* _.first(food, { 'type': 'fruit' }); | |
* // => [{ 'name': 'apple', 'type': 'fruit' }, { 'name': 'banana', 'type': 'fruit' }] | |
*/ | |
function first(array, callback, thisArg) { | |
if (array) { | |
var n = 0, | |
length = array.length; | |
if (typeof callback != 'number' && callback != null) { | |
var index = -1; | |
callback = lodash.createCallback(callback, thisArg); | |
while (++index < length && callback(array[index], index, array)) { | |
n++; | |
} | |
} else { | |
n = callback; | |
if (n == null || thisArg) { | |
return array[0]; | |
} | |
} | |
return slice(array, 0, nativeMin(nativeMax(0, n), length)); | |
} | |
} | |
/** | |
* Flattens a nested array (the nesting can be to any depth). If `isShallow` | |
* is truthy, `array` will only be flattened a single level. If `callback` | |
* is passed, each element of `array` is passed through a `callback` before | |
* flattening. The `callback` is bound to `thisArg` and invoked with three | |
* arguments; (value, index, array). | |
* | |
* If a property name is passed for `callback`, the created "_.pluck" style | |
* callback will return the property value of the given element. | |
* | |
* If an object is passed for `callback`, the created "_.where" style callback | |
* will return `true` for elements that have the properties of the given object, | |
* else `false`. | |
* | |
* @static | |
* @memberOf _ | |
* @category Arrays | |
* @param {Array} array The array to flatten. | |
* @param {Boolean} [isShallow=false] A flag to indicate only flattening a single level. | |
* @param {Function|Object|String} [callback=identity] The function called per | |
* iteration. If a property name or object is passed, it will be used to create | |
* a "_.pluck" or "_.where" style callback, respectively. | |
* @param {Mixed} [thisArg] The `this` binding of `callback`. | |
* @returns {Array} Returns a new flattened array. | |
* @example | |
* | |
* _.flatten([1, [2], [3, [[4]]]]); | |
* // => [1, 2, 3, 4]; | |
* | |
* _.flatten([1, [2], [3, [[4]]]], true); | |
* // => [1, 2, 3, [[4]]]; | |
* | |
* var stooges = [ | |
* { 'name': 'curly', 'quotes': ['Oh, a wise guy, eh?', 'Poifect!'] }, | |
* { 'name': 'moe', 'quotes': ['Spread out!', 'You knucklehead!'] } | |
* ]; | |
* | |
* // using "_.pluck" callback shorthand | |
* _.flatten(stooges, 'quotes'); | |
* // => ['Oh, a wise guy, eh?', 'Poifect!', 'Spread out!', 'You knucklehead!'] | |
*/ | |
var flatten = overloadWrapper(function flatten(array, isShallow, callback) { | |
var index = -1, | |
length = array ? array.length : 0, | |
result = []; | |
while (++index < length) { | |
var value = array[index]; | |
if (callback) { | |
value = callback(value, index, array); | |
} | |
// recursively flatten arrays (susceptible to call stack limits) | |
if (isArray(value)) { | |
push.apply(result, isShallow ? value : flatten(value)); | |
} else { | |
result.push(value); | |
} | |
} | |
return result; | |
}); | |
/** | |
* Gets the index at which the first occurrence of `value` is found using | |
* strict equality for comparisons, i.e. `===`. If the `array` is already | |
* sorted, passing `true` for `fromIndex` will run a faster binary search. | |
* | |
* @static | |
* @memberOf _ | |
* @category Arrays | |
* @param {Array} array The array to search. | |
* @param {Mixed} value The value to search for. | |
* @param {Boolean|Number} [fromIndex=0] The index to search from or `true` to | |
* perform a binary search on a sorted `array`. | |
* @returns {Number} Returns the index of the matched value or `-1`. | |
* @example | |
* | |
* _.indexOf([1, 2, 3, 1, 2, 3], 2); | |
* // => 1 | |
* | |
* _.indexOf([1, 2, 3, 1, 2, 3], 2, 3); | |
* // => 4 | |
* | |
* _.indexOf([1, 1, 2, 2, 3, 3], 2, true); | |
* // => 2 | |
*/ | |
function indexOf(array, value, fromIndex) { | |
if (typeof fromIndex == 'number') { | |
var length = array ? array.length : 0; | |
fromIndex = (fromIndex < 0 ? nativeMax(0, length + fromIndex) : fromIndex || 0); | |
} else if (fromIndex) { | |
var index = sortedIndex(array, value); | |
return array[index] === value ? index : -1; | |
} | |
return array ? basicIndexOf(array, value, fromIndex) : -1; | |
} | |
/** | |
* Gets all but the last element of `array`. If a number `n` is passed, the | |
* last `n` elements are excluded from the result. If a `callback` function | |
* is passed, elements at the end of the array are excluded from the result | |
* as long as the `callback` returns truthy. The `callback` is bound to | |
* `thisArg` and invoked with three arguments; (value, index, array). | |
* | |
* If a property name is passed for `callback`, the created "_.pluck" style | |
* callback will return the property value of the given element. | |
* | |
* If an object is passed for `callback`, the created "_.where" style callback | |
* will return `true` for elements that have the properties of the given object, | |
* else `false`. | |
* | |
* @static | |
* @memberOf _ | |
* @category Arrays | |
* @param {Array} array The array to query. | |
* @param {Function|Object|Number|String} [callback|n=1] The function called | |
* per element or the number of elements to exclude. If a property name or | |
* object is passed, it will be used to create a "_.pluck" or "_.where" | |
* style callback, respectively. | |
* @param {Mixed} [thisArg] The `this` binding of `callback`. | |
* @returns {Array} Returns a slice of `array`. | |
* @example | |
* | |
* _.initial([1, 2, 3]); | |
* // => [1, 2] | |
* | |
* _.initial([1, 2, 3], 2); | |
* // => [1] | |
* | |
* _.initial([1, 2, 3], function(num) { | |
* return num > 1; | |
* }); | |
* // => [1] | |
* | |
* var food = [ | |
* { 'name': 'beet', 'organic': false }, | |
* { 'name': 'carrot', 'organic': true } | |
* ]; | |
* | |
* // using "_.pluck" callback shorthand | |
* _.initial(food, 'organic'); | |
* // => [{ 'name': 'beet', 'organic': false }] | |
* | |
* var food = [ | |
* { 'name': 'banana', 'type': 'fruit' }, | |
* { 'name': 'beet', 'type': 'vegetable' }, | |
* { 'name': 'carrot', 'type': 'vegetable' } | |
* ]; | |
* | |
* // using "_.where" callback shorthand | |
* _.initial(food, { 'type': 'vegetable' }); | |
* // => [{ 'name': 'banana', 'type': 'fruit' }] | |
*/ | |
function initial(array, callback, thisArg) { | |
if (!array) { | |
return []; | |
} | |
var n = 0, | |
length = array.length; | |
if (typeof callback != 'number' && callback != null) { | |
var index = length; | |
callback = lodash.createCallback(callback, thisArg); | |
while (index-- && callback(array[index], index, array)) { | |
n++; | |
} | |
} else { | |
n = (callback == null || thisArg) ? 1 : callback || n; | |
} | |
return slice(array, 0, nativeMin(nativeMax(0, length - n), length)); | |
} | |
/** | |
* Computes the intersection of all the passed-in arrays using strict equality | |
* for comparisons, i.e. `===`. | |
* | |
* @static | |
* @memberOf _ | |
* @category Arrays | |
* @param {Array} [array1, array2, ...] Arrays to process. | |
* @returns {Array} Returns a new array of unique elements that are present | |
* in **all** of the arrays. | |
* @example | |
* | |
* _.intersection([1, 2, 3], [101, 2, 1, 10], [2, 1]); | |
* // => [1, 2] | |
*/ | |
function intersection(array) { | |
var args = arguments, | |
argsLength = args.length, | |
argsIndex = -1, | |
caches = getArray(), | |
index = -1, | |
indexOf = getIndexOf(), | |
length = array ? array.length : 0, | |
result = [], | |
seen = getArray(); | |
while (++argsIndex < argsLength) { | |
var value = args[argsIndex]; | |
caches[argsIndex] = indexOf === basicIndexOf && | |
(value ? value.length : 0) >= largeArraySize && | |
createCache(argsIndex ? args[argsIndex] : seen); | |
} | |
outer: | |
while (++index < length) { | |
var cache = caches[0]; | |
value = array[index]; | |
if ((cache ? cacheIndexOf(cache, value) : indexOf(seen, value)) < 0) { | |
argsIndex = argsLength; | |
(cache || seen).push(value); | |
while (--argsIndex) { | |
cache = caches[argsIndex]; | |
if ((cache ? cacheIndexOf(cache, value) : indexOf(args[argsIndex], value)) < 0) { | |
continue outer; | |
} | |
} | |
result.push(value); | |
} | |
} | |
while (argsLength--) { | |
cache = caches[argsLength]; | |
if (cache) { | |
releaseObject(cache); | |
} | |
} | |
releaseArray(caches); | |
releaseArray(seen); | |
return result; | |
} | |
/** | |
* Gets the last element of the `array`. If a number `n` is passed, the | |
* last `n` elements of the `array` are returned. If a `callback` function | |
* is passed, elements at the end of the array are returned as long as the | |
* `callback` returns truthy. The `callback` is bound to `thisArg` and | |
* invoked with three arguments;(value, index, array). | |
* | |
* | |
* If a property name is passed for `callback`, the created "_.pluck" style | |
* callback will return the property value of the given element. | |
* | |
* If an object is passed for `callback`, the created "_.where" style callback | |
* will return `true` for elements that have the properties of the given object, | |
* else `false`. | |
* | |
* @static | |
* @memberOf _ | |
* @category Arrays | |
* @param {Array} array The array to query. | |
* @param {Function|Object|Number|String} [callback|n] The function called | |
* per element or the number of elements to return. If a property name or | |
* object is passed, it will be used to create a "_.pluck" or "_.where" | |
* style callback, respectively. | |
* @param {Mixed} [thisArg] The `this` binding of `callback`. | |
* @returns {Mixed} Returns the last element(s) of `array`. | |
* @example | |
* | |
* _.last([1, 2, 3]); | |
* // => 3 | |
* | |
* _.last([1, 2, 3], 2); | |
* // => [2, 3] | |
* | |
* _.last([1, 2, 3], function(num) { | |
* return num > 1; | |
* }); | |
* // => [2, 3] | |
* | |
* var food = [ | |
* { 'name': 'beet', 'organic': false }, | |
* { 'name': 'carrot', 'organic': true } | |
* ]; | |
* | |
* // using "_.pluck" callback shorthand | |
* _.last(food, 'organic'); | |
* // => [{ 'name': 'carrot', 'organic': true }] | |
* | |
* var food = [ | |
* { 'name': 'banana', 'type': 'fruit' }, | |
* { 'name': 'beet', 'type': 'vegetable' }, | |
* { 'name': 'carrot', 'type': 'vegetable' } | |
* ]; | |
* | |
* // using "_.where" callback shorthand | |
* _.last(food, { 'type': 'vegetable' }); | |
* // => [{ 'name': 'beet', 'type': 'vegetable' }, { 'name': 'carrot', 'type': 'vegetable' }] | |
*/ | |
function last(array, callback, thisArg) { | |
if (array) { | |
var n = 0, | |
length = array.length; | |
if (typeof callback != 'number' && callback != null) { | |
var index = length; | |
callback = lodash.createCallback(callback, thisArg); | |
while (index-- && callback(array[index], index, array)) { | |
n++; | |
} | |
} else { | |
n = callback; | |
if (n == null || thisArg) { | |
return array[length - 1]; | |
} | |
} | |
return slice(array, nativeMax(0, length - n)); | |
} | |
} | |
/** | |
* Gets the index at which the last occurrence of `value` is found using strict | |
* equality for comparisons, i.e. `===`. If `fromIndex` is negative, it is used | |
* as the offset from the end of the collection. | |
* | |
* @static | |
* @memberOf _ | |
* @category Arrays | |
* @param {Array} array The array to search. | |
* @param {Mixed} value The value to search for. | |
* @param {Number} [fromIndex=array.length-1] The index to search from. | |
* @returns {Number} Returns the index of the matched value or `-1`. | |
* @example | |
* | |
* _.lastIndexOf([1, 2, 3, 1, 2, 3], 2); | |
* // => 4 | |
* | |
* _.lastIndexOf([1, 2, 3, 1, 2, 3], 2, 3); | |
* // => 1 | |
*/ | |
function lastIndexOf(array, value, fromIndex) { | |
var index = array ? array.length : 0; | |
if (typeof fromIndex == 'number') { | |
index = (fromIndex < 0 ? nativeMax(0, index + fromIndex) : nativeMin(fromIndex, index - 1)) + 1; | |
} | |
while (index--) { | |
if (array[index] === value) { | |
return index; | |
} | |
} | |
return -1; | |
} | |
/** | |
* Creates an array of numbers (positive and/or negative) progressing from | |
* `start` up to but not including `end`. | |
* | |
* @static | |
* @memberOf _ | |
* @category Arrays | |
* @param {Number} [start=0] The start of the range. | |
* @param {Number} end The end of the range. | |
* @param {Number} [step=1] The value to increment or decrement by. | |
* @returns {Array} Returns a new range array. | |
* @example | |
* | |
* _.range(10); | |
* // => [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] | |
* | |
* _.range(1, 11); | |
* // => [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] | |
* | |
* _.range(0, 30, 5); | |
* // => [0, 5, 10, 15, 20, 25] | |
* | |
* _.range(0, -10, -1); | |
* // => [0, -1, -2, -3, -4, -5, -6, -7, -8, -9] | |
* | |
* _.range(0); | |
* // => [] | |
*/ | |
function range(start, end, step) { | |
start = +start || 0; | |
step = +step || 1; | |
if (end == null) { | |
end = start; | |
start = 0; | |
} | |
// use `Array(length)` so V8 will avoid the slower "dictionary" mode | |
// http://youtu.be/XAqIpGU8ZZk#t=17m25s | |
var index = -1, | |
length = nativeMax(0, ceil((end - start) / step)), | |
result = Array(length); | |
while (++index < length) { | |
result[index] = start; | |
start += step; | |
} | |
return result; | |
} | |
/** | |
* The opposite of `_.initial`, this method gets all but the first value of | |
* `array`. If a number `n` is passed, the first `n` values are excluded from | |
* the result. If a `callback` function is passed, elements at the beginning | |
* of the array are excluded from the result as long as the `callback` returns | |
* truthy. The `callback` is bound to `thisArg` and invoked with three | |
* arguments; (value, index, array). | |
* | |
* If a property name is passed for `callback`, the created "_.pluck" style | |
* callback will return the property value of the given element. | |
* | |
* If an object is passed for `callback`, the created "_.where" style callback | |
* will return `true` for elements that have the properties of the given object, | |
* else `false`. | |
* | |
* @static | |
* @memberOf _ | |
* @alias drop, tail | |
* @category Arrays | |
* @param {Array} array The array to query. | |
* @param {Function|Object|Number|String} [callback|n=1] The function called | |
* per element or the number of elements to exclude. If a property name or | |
* object is passed, it will be used to create a "_.pluck" or "_.where" | |
* style callback, respectively. | |
* @param {Mixed} [thisArg] The `this` binding of `callback`. | |
* @returns {Array} Returns a slice of `array`. | |
* @example | |
* | |
* _.rest([1, 2, 3]); | |
* // => [2, 3] | |
* | |
* _.rest([1, 2, 3], 2); | |
* // => [3] | |
* | |
* _.rest([1, 2, 3], function(num) { | |
* return num < 3; | |
* }); | |
* // => [3] | |
* | |
* var food = [ | |
* { 'name': 'banana', 'organic': true }, | |
* { 'name': 'beet', 'organic': false }, | |
* ]; | |
* | |
* // using "_.pluck" callback shorthand | |
* _.rest(food, 'organic'); | |
* // => [{ 'name': 'beet', 'organic': false }] | |
* | |
* var food = [ | |
* { 'name': 'apple', 'type': 'fruit' }, | |
* { 'name': 'banana', 'type': 'fruit' }, | |
* { 'name': 'beet', 'type': 'vegetable' } | |
* ]; | |
* | |
* // using "_.where" callback shorthand | |
* _.rest(food, { 'type': 'fruit' }); | |
* // => [{ 'name': 'beet', 'type': 'vegetable' }] | |
*/ | |
function rest(array, callback, thisArg) { | |
if (typeof callback != 'number' && callback != null) { | |
var n = 0, | |
index = -1, | |
length = array ? array.length : 0; | |
callback = lodash.createCallback(callback, thisArg); | |
while (++index < length && callback(array[index], index, array)) { | |
n++; | |
} | |
} else { | |
n = (callback == null || thisArg) ? 1 : nativeMax(0, callback); | |
} | |
return slice(array, n); | |
} | |
/** | |
* Uses a binary search to determine the smallest index at which the `value` | |
* should be inserted into `array` in order to maintain the sort order of the | |
* sorted `array`. If `callback` is passed, it will be executed for `value` and | |
* each element in `array` to compute their sort ranking. The `callback` is | |
* bound to `thisArg` and invoked with one argument; (value). | |
* | |
* If a property name is passed for `callback`, the created "_.pluck" style | |
* callback will return the property value of the given element. | |
* | |
* If an object is passed for `callback`, the created "_.where" style callback | |
* will return `true` for elements that have the properties of the given object, | |
* else `false`. | |
* | |
* @static | |
* @memberOf _ | |
* @category Arrays | |
* @param {Array} array The array to inspect. | |
* @param {Mixed} value The value to evaluate. | |
* @param {Function|Object|String} [callback=identity] The function called per | |
* iteration. If a property name or object is passed, it will be used to create | |
* a "_.pluck" or "_.where" style callback, respectively. | |
* @param {Mixed} [thisArg] The `this` binding of `callback`. | |
* @returns {Number} Returns the index at which the value should be inserted | |
* into `array`. | |
* @example | |
* | |
* _.sortedIndex([20, 30, 50], 40); | |
* // => 2 | |
* | |
* // using "_.pluck" callback shorthand | |
* _.sortedIndex([{ 'x': 20 }, { 'x': 30 }, { 'x': 50 }], { 'x': 40 }, 'x'); | |
* // => 2 | |
* | |
* var dict = { | |
* 'wordToNumber': { 'twenty': 20, 'thirty': 30, 'fourty': 40, 'fifty': 50 } | |
* }; | |
* | |
* _.sortedIndex(['twenty', 'thirty', 'fifty'], 'fourty', function(word) { | |
* return dict.wordToNumber[word]; | |
* }); | |
* // => 2 | |
* | |
* _.sortedIndex(['twenty', 'thirty', 'fifty'], 'fourty', function(word) { | |
* return this.wordToNumber[word]; | |
* }, dict); | |
* // => 2 | |
*/ | |
function sortedIndex(array, value, callback, thisArg) { | |
var low = 0, | |
high = array ? array.length : low; | |
// explicitly reference `identity` for better inlining in Firefox | |
callback = callback ? lodash.createCallback(callback, thisArg, 1) : identity; | |
value = callback(value); | |
while (low < high) { | |
var mid = (low + high) >>> 1; | |
(callback(array[mid]) < value) | |
? low = mid + 1 | |
: high = mid; | |
} | |
return low; | |
} | |
/** | |
* Computes the union of the passed-in arrays using strict equality for | |
* comparisons, i.e. `===`. | |
* | |
* @static | |
* @memberOf _ | |
* @category Arrays | |
* @param {Array} [array1, array2, ...] Arrays to process. | |
* @returns {Array} Returns a new array of unique values, in order, that are | |
* present in one or more of the arrays. | |
* @example | |
* | |
* _.union([1, 2, 3], [101, 2, 1, 10], [2, 1]); | |
* // => [1, 2, 3, 101, 10] | |
*/ | |
function union(array) { | |
if (!isArray(array)) { | |
arguments[0] = array ? nativeSlice.call(array) : arrayRef; | |
} | |
return uniq(concat.apply(arrayRef, arguments)); | |
} | |
/** | |
* Creates a duplicate-value-free version of the `array` using strict equality | |
* for comparisons, i.e. `===`. If the `array` is already sorted, passing `true` | |
* for `isSorted` will run a faster algorithm. If `callback` is passed, each | |
* element of `array` is passed through the `callback` before uniqueness is computed. | |
* The `callback` is bound to `thisArg` and invoked with three arguments; (value, index, array). | |
* | |
* If a property name is passed for `callback`, the created "_.pluck" style | |
* callback will return the property value of the given element. | |
* | |
* If an object is passed for `callback`, the created "_.where" style callback | |
* will return `true` for elements that have the properties of the given object, | |
* else `false`. | |
* | |
* @static | |
* @memberOf _ | |
* @alias unique | |
* @category Arrays | |
* @param {Array} array The array to process. | |
* @param {Boolean} [isSorted=false] A flag to indicate that the `array` is already sorted. | |
* @param {Function|Object|String} [callback=identity] The function called per | |
* iteration. If a property name or object is passed, it will be used to create | |
* a "_.pluck" or "_.where" style callback, respectively. | |
* @param {Mixed} [thisArg] The `this` binding of `callback`. | |
* @returns {Array} Returns a duplicate-value-free array. | |
* @example | |
* | |
* _.uniq([1, 2, 1, 3, 1]); | |
* // => [1, 2, 3] | |
* | |
* _.uniq([1, 1, 2, 2, 3], true); | |
* // => [1, 2, 3] | |
* | |
* _.uniq(['A', 'b', 'C', 'a', 'B', 'c'], function(letter) { return letter.toLowerCase(); }); | |
* // => ['A', 'b', 'C'] | |
* | |
* _.uniq([1, 2.5, 3, 1.5, 2, 3.5], function(num) { return this.floor(num); }, Math); | |
* // => [1, 2.5, 3] | |
* | |
* // using "_.pluck" callback shorthand | |
* _.uniq([{ 'x': 1 }, { 'x': 2 }, { 'x': 1 }], 'x'); | |
* // => [{ 'x': 1 }, { 'x': 2 }] | |
*/ | |
var uniq = overloadWrapper(function(array, isSorted, callback) { | |
var index = -1, | |
indexOf = getIndexOf(), | |
length = array ? array.length : 0, | |
result = []; | |
var isLarge = !isSorted && length >= largeArraySize && indexOf === basicIndexOf, | |
seen = (callback || isLarge) ? getArray() : result; | |
if (isLarge) { | |
var cache = createCache(seen); | |
if (cache) { | |
indexOf = cacheIndexOf; | |
seen = cache; | |
} else { | |
isLarge = false; | |
seen = callback ? seen : (releaseArray(seen), result); | |
} | |
} | |
while (++index < length) { | |
var value = array[index], | |
computed = callback ? callback(value, index, array) : value; | |
if (isSorted | |
? !index || seen[seen.length - 1] !== computed | |
: indexOf(seen, computed) < 0 | |
) { | |
if (callback || isLarge) { | |
seen.push(computed); | |
} | |
result.push(value); | |
} | |
} | |
if (isLarge) { | |
releaseArray(seen.array); | |
releaseObject(seen); | |
} else if (callback) { | |
releaseArray(seen); | |
} | |
return result; | |
}); | |
/** | |
* The inverse of `_.zip`, this method splits groups of elements into arrays | |
* composed of elements from each group at their corresponding indexes. | |
* | |
* @static | |
* @memberOf _ | |
* @category Arrays | |
* @param {Array} array The array to process. | |
* @returns {Array} Returns a new array of the composed arrays. | |
* @example | |
* | |
* _.unzip([['moe', 30, true], ['larry', 40, false]]); | |
* // => [['moe', 'larry'], [30, 40], [true, false]]; | |
*/ | |
function unzip(array) { | |
var index = -1, | |
length = array ? max(pluck(array, 'length')) : 0, | |
result = Array(length < 0 ? 0 : length); | |
while (++index < length) { | |
result[index] = pluck(array, index); | |
} | |
return result; | |
} | |
/** | |
* Creates an array with all occurrences of the passed values removed using | |
* strict equality for comparisons, i.e. `===`. | |
* | |
* @static | |
* @memberOf _ | |
* @category Arrays | |
* @param {Array} array The array to filter. | |
* @param {Mixed} [value1, value2, ...] Values to remove. | |
* @returns {Array} Returns a new filtered array. | |
* @example | |
* | |
* _.without([1, 2, 1, 0, 3, 1, 4], 0, 1); | |
* // => [2, 3, 4] | |
*/ | |
function without(array) { | |
return difference(array, nativeSlice.call(arguments, 1)); | |
} | |
/** | |
* Groups the elements of each array at their corresponding indexes. Useful for | |
* separate data sources that are coordinated through matching array indexes. | |
* For a matrix of nested arrays, `_.zip.apply(...)` can transpose the matrix | |
* in a similar fashion. | |
* | |
* @static | |
* @memberOf _ | |
* @category Arrays | |
* @param {Array} [array1, array2, ...] Arrays to process. | |
* @returns {Array} Returns a new array of grouped elements. | |
* @example | |
* | |
* _.zip(['moe', 'larry'], [30, 40], [true, false]); | |
* // => [['moe', 30, true], ['larry', 40, false]] | |
*/ | |
function zip(array) { | |
return array ? unzip(arguments) : []; | |
} | |
/** | |
* Creates an object composed from arrays of `keys` and `values`. Pass either | |
* a single two dimensional array, i.e. `[[key1, value1], [key2, value2]]`, or | |
* two arrays, one of `keys` and one of corresponding `values`. | |
* | |
* @static | |
* @memberOf _ | |
* @alias object | |
* @category Arrays | |
* @param {Array} keys The array of keys. | |
* @param {Array} [values=[]] The array of values. | |
* @returns {Object} Returns an object composed of the given keys and | |
* corresponding values. | |
* @example | |
* | |
* _.zipObject(['moe', 'larry'], [30, 40]); | |
* // => { 'moe': 30, 'larry': 40 } | |
*/ | |
function zipObject(keys, values) { | |
var index = -1, | |
length = keys ? keys.length : 0, | |
result = {}; | |
while (++index < length) { | |
var key = keys[index]; | |
if (values) { | |
result[key] = values[index]; | |
} else { | |
result[key[0]] = key[1]; | |
} | |
} | |
return result; | |
} | |
/*--------------------------------------------------------------------------*/ | |
/** | |
* If `n` is greater than `0`, a function is created that is restricted to | |
* executing `func`, with the `this` binding and arguments of the created | |
* function, only after it is called `n` times. If `n` is less than `1`, | |
* `func` is executed immediately, without a `this` binding or additional | |
* arguments, and its result is returned. | |
* | |
* @static | |
* @memberOf _ | |
* @category Functions | |
* @param {Number} n The number of times the function must be called before | |
* it is executed. | |
* @param {Function} func The function to restrict. | |
* @returns {Function} Returns the new restricted function. | |
* @example | |
* | |
* var renderNotes = _.after(notes.length, render); | |
* _.forEach(notes, function(note) { | |
* note.asyncSave({ 'success': renderNotes }); | |
* }); | |
* // `renderNotes` is run once, after all notes have saved | |
*/ | |
function after(n, func) { | |
if (n < 1) { | |
return func(); | |
} | |
return function() { | |
if (--n < 1) { | |
return func.apply(this, arguments); | |
} | |
}; | |
} | |
/** | |
* Creates a function that, when called, invokes `func` with the `this` | |
* binding of `thisArg` and prepends any additional `bind` arguments to those | |
* passed to the bound function. | |
* | |
* @static | |
* @memberOf _ | |
* @category Functions | |
* @param {Function} func The function to bind. | |
* @param {Mixed} [thisArg] The `this` binding of `func`. | |
* @param {Mixed} [arg1, arg2, ...] Arguments to be partially applied. | |
* @returns {Function} Returns the new bound function. | |
* @example | |
* | |
* var func = function(greeting) { | |
* return greeting + ' ' + this.name; | |
* }; | |
* | |
* func = _.bind(func, { 'name': 'moe' }, 'hi'); | |
* func(); | |
* // => 'hi moe' | |
*/ | |
function bind(func, thisArg) { | |
// use `Function#bind` if it exists and is fast | |
// (in V8 `Function#bind` is slower except when partially applied) | |
return support.fastBind || (nativeBind && arguments.length > 2) | |
? nativeBind.call.apply(nativeBind, arguments) | |
: createBound(func, thisArg, nativeSlice.call(arguments, 2)); | |
} | |
/** | |
* Binds methods on `object` to `object`, overwriting the existing method. | |
* Method names may be specified as individual arguments or as arrays of method | |
* names. If no method names are provided, all the function properties of `object` | |
* will be bound. | |
* | |
* @static | |
* @memberOf _ | |
* @category Functions | |
* @param {Object} object The object to bind and assign the bound methods to. | |
* @param {String} [methodName1, methodName2, ...] Method names on the object to bind. | |
* @returns {Object} Returns `object`. | |
* @example | |
* | |
* var view = { | |
* 'label': 'docs', | |
* 'onClick': function() { alert('clicked ' + this.label); } | |
* }; | |
* | |
* _.bindAll(view); | |
* jQuery('#docs').on('click', view.onClick); | |
* // => alerts 'clicked docs', when the button is clicked | |
*/ | |
function bindAll(object) { | |
var funcs = arguments.length > 1 ? concat.apply(arrayRef, nativeSlice.call(arguments, 1)) : functions(object), | |
index = -1, | |
length = funcs.length; | |
while (++index < length) { | |
var key = funcs[index]; | |
object[key] = bind(object[key], object); | |
} | |
return object; | |
} | |
/** | |
* Creates a function that, when called, invokes the method at `object[key]` | |
* and prepends any additional `bindKey` arguments to those passed to the bound | |
* function. This method differs from `_.bind` by allowing bound functions to | |
* reference methods that will be redefined or don't yet exist. | |
* See http://michaux.ca/articles/lazy-function-definition-pattern. | |
* | |
* @static | |
* @memberOf _ | |
* @category Functions | |
* @param {Object} object The object the method belongs to. | |
* @param {String} key The key of the method. | |
* @param {Mixed} [arg1, arg2, ...] Arguments to be partially applied. | |
* @returns {Function} Returns the new bound function. | |
* @example | |
* | |
* var object = { | |
* 'name': 'moe', | |
* 'greet': function(greeting) { | |
* return greeting + ' ' + this.name; | |
* } | |
* }; | |
* | |
* var func = _.bindKey(object, 'greet', 'hi'); | |
* func(); | |
* // => 'hi moe' | |
* | |
* object.greet = function(greeting) { | |
* return greeting + ', ' + this.name + '!'; | |
* }; | |
* | |
* func(); | |
* // => 'hi, moe!' | |
*/ | |
function bindKey(object, key) { | |
return createBound(object, key, nativeSlice.call(arguments, 2), indicatorObject); | |
} | |
/** | |
* Creates a function that is the composition of the passed functions, | |
* where each function consumes the return value of the function that follows. | |
* For example, composing the functions `f()`, `g()`, and `h()` produces `f(g(h()))`. | |
* Each function is executed with the `this` binding of the composed function. | |
* | |
* @static | |
* @memberOf _ | |
* @category Functions | |
* @param {Function} [func1, func2, ...] Functions to compose. | |
* @returns {Function} Returns the new composed function. | |
* @example | |
* | |
* var greet = function(name) { return 'hi ' + name; }; | |
* var exclaim = function(statement) { return statement + '!'; }; | |
* var welcome = _.compose(exclaim, greet); | |
* welcome('moe'); | |
* // => 'hi moe!' | |
*/ | |
function compose() { | |
var funcs = arguments; | |
return function() { | |
var args = arguments, | |
length = funcs.length; | |
while (length--) { | |
args = [funcs[length].apply(this, args)]; | |
} | |
return args[0]; | |
}; | |
} | |
/** | |
* Produces a callback bound to an optional `thisArg`. If `func` is a property | |
* name, the created callback will return the property value for a given element. | |
* If `func` is an object, the created callback will return `true` for elements | |
* that contain the equivalent object properties, otherwise it will return `false`. | |
* | |
* Note: All Lo-Dash methods, that accept a `callback` argument, use `_.createCallback`. | |
* | |
* @static | |
* @memberOf _ | |
* @category Functions | |
* @param {Mixed} [func=identity] The value to convert to a callback. | |
* @param {Mixed} [thisArg] The `this` binding of the created callback. | |
* @param {Number} [argCount=3] The number of arguments the callback accepts. | |
* @returns {Function} Returns a callback function. | |
* @example | |
* | |
* var stooges = [ | |
* { 'name': 'moe', 'age': 40 }, | |
* { 'name': 'larry', 'age': 50 } | |
* ]; | |
* | |
* // wrap to create custom callback shorthands | |
* _.createCallback = _.wrap(_.createCallback, function(func, callback, thisArg) { | |
* var match = /^(.+?)__([gl]t)(.+)$/.exec(callback); | |
* return !match ? func(callback, thisArg) : function(object) { | |
* return match[2] == 'gt' ? object[match[1]] > match[3] : object[match[1]] < match[3]; | |
* }; | |
* }); | |
* | |
* _.filter(stooges, 'age__gt45'); | |
* // => [{ 'name': 'larry', 'age': 50 }] | |
* | |
* // create mixins with support for "_.pluck" and "_.where" callback shorthands | |
* _.mixin({ | |
* 'toLookup': function(collection, callback, thisArg) { | |
* callback = _.createCallback(callback, thisArg); | |
* return _.reduce(collection, function(result, value, index, collection) { | |
* return (result[callback(value, index, collection)] = value, result); | |
* }, {}); | |
* } | |
* }); | |
* | |
* _.toLookup(stooges, 'name'); | |
* // => { 'moe': { 'name': 'moe', 'age': 40 }, 'larry': { 'name': 'larry', 'age': 50 } } | |
*/ | |
function createCallback(func, thisArg, argCount) { | |
if (func == null) { | |
return identity; | |
} | |
var type = typeof func; | |
if (type != 'function') { | |
if (type != 'object') { | |
return function(object) { | |
return object[func]; | |
}; | |
} | |
var props = keys(func); | |
return function(object) { | |
var length = props.length, | |
result = false; | |
while (length--) { | |
if (!(result = isEqual(object[props[length]], func[props[length]], indicatorObject))) { | |
break; | |
} | |
} | |
return result; | |
}; | |
} | |
if (typeof thisArg == 'undefined' || (reThis && !reThis.test(fnToString.call(func)))) { | |
return func; | |
} | |
if (argCount === 1) { | |
return function(value) { | |
return func.call(thisArg, value); | |
}; | |
} | |
if (argCount === 2) { | |
return function(a, b) { | |
return func.call(thisArg, a, b); | |
}; | |
} | |
if (argCount === 4) { | |
return function(accumulator, value, index, collection) { | |
return func.call(thisArg, accumulator, value, index, collection); | |
}; | |
} | |
return function(value, index, collection) { | |
return func.call(thisArg, value, index, collection); | |
}; | |
} | |
/** | |
* Creates a function that will delay the execution of `func` until after | |
* `wait` milliseconds have elapsed since the last time it was invoked. Pass | |
* an `options` object to indicate that `func` should be invoked on the leading | |
* and/or trailing edge of the `wait` timeout. Subsequent calls to the debounced | |
* function will return the result of the last `func` call. | |
* | |
* Note: If `leading` and `trailing` options are `true`, `func` will be called | |
* on the trailing edge of the timeout only if the the debounced function is | |
* invoked more than once during the `wait` timeout. | |
* | |
* @static | |
* @memberOf _ | |
* @category Functions | |
* @param {Function} func The function to debounce. | |
* @param {Number} wait The number of milliseconds to delay. | |
* @param {Object} options The options object. | |
* [leading=false] A boolean to specify execution on the leading edge of the timeout. | |
* [maxWait] The maximum time `func` is allowed to be delayed before it's called. | |
* [trailing=true] A boolean to specify execution on the trailing edge of the timeout. | |
* @returns {Function} Returns the new debounced function. | |
* @example | |
* | |
* var lazyLayout = _.debounce(calculateLayout, 300); | |
* jQuery(window).on('resize', lazyLayout); | |
* | |
* jQuery('#postbox').on('click', _.debounce(sendMail, 200, { | |
* 'leading': true, | |
* 'trailing': false | |
* }); | |
*/ | |
function debounce(func, wait, options) { | |
var args, | |
result, | |
thisArg, | |
callCount = 0, | |
lastCalled = 0, | |
maxWait = false, | |
maxTimeoutId = null, | |
timeoutId = null, | |
trailing = true; | |
function clear() { | |
clearTimeout(maxTimeoutId); | |
clearTimeout(timeoutId); | |
callCount = 0; | |
maxTimeoutId = timeoutId = null; | |
} | |
function delayed() { | |
var isCalled = trailing && (!leading || callCount > 1); | |
clear(); | |
if (isCalled) { | |
if (maxWait !== false) { | |
lastCalled = new Date; | |
} | |
result = func.apply(thisArg, args); | |
} | |
} | |
function maxDelayed() { | |
clear(); | |
if (trailing || (maxWait !== wait)) { | |
lastCalled = new Date; | |
result = func.apply(thisArg, args); | |
} | |
} | |
wait = nativeMax(0, wait || 0); | |
if (options === true) { | |
var leading = true; | |
trailing = false; | |
} else if (isObject(options)) { | |
leading = options.leading; | |
maxWait = 'maxWait' in options && nativeMax(wait, options.maxWait || 0); | |
trailing = 'trailing' in options ? options.trailing : trailing; | |
} | |
return function() { | |
args = arguments; | |
thisArg = this; | |
callCount++; | |
// avoid issues with Titanium and `undefined` timeout ids | |
// https://github.com/appcelerator/titanium_mobile/blob/3_1_0_GA/android/titanium/src/java/ti/modules/titanium/TitaniumModule.java#L185-L192 | |
clearTimeout(timeoutId); | |
if (maxWait === false) { | |
if (leading && callCount < 2) { | |
result = func.apply(thisArg, args); | |
} | |
} else { | |
var now = new Date; | |
if (!maxTimeoutId && !leading) { | |
lastCalled = now; | |
} | |
var remaining = maxWait - (now - lastCalled); | |
if (remaining <= 0) { | |
clearTimeout(maxTimeoutId); | |
maxTimeoutId = null; | |
lastCalled = now; | |
result = func.apply(thisArg, args); | |
} | |
else if (!maxTimeoutId) { | |
maxTimeoutId = setTimeout(maxDelayed, remaining); | |
} | |
} | |
if (wait !== maxWait) { | |
timeoutId = setTimeout(delayed, wait); | |
} | |
return result; | |
}; | |
} | |
/** | |
* Defers executing the `func` function until the current call stack has cleared. | |
* Additional arguments will be passed to `func` when it is invoked. | |
* | |
* @static | |
* @memberOf _ | |
* @category Functions | |
* @param {Function} func The function to defer. | |
* @param {Mixed} [arg1, arg2, ...] Arguments to invoke the function with. | |
* @returns {Number} Returns the timer id. | |
* @example | |
* | |
* _.defer(function() { alert('deferred'); }); | |
* // returns from the function before `alert` is called | |
*/ | |
function defer(func) { | |
var args = nativeSlice.call(arguments, 1); | |
return setTimeout(function() { func.apply(undefined, args); }, 1); | |
} | |
// use `setImmediate` if it's available in Node.js | |
if (isV8 && freeModule && typeof setImmediate == 'function') { | |
defer = bind(setImmediate, context); | |
} | |
/** | |
* Executes the `func` function after `wait` milliseconds. Additional arguments | |
* will be passed to `func` when it is invoked. | |
* | |
* @static | |
* @memberOf _ | |
* @category Functions | |
* @param {Function} func The function to delay. | |
* @param {Number} wait The number of milliseconds to delay execution. | |
* @param {Mixed} [arg1, arg2, ...] Arguments to invoke the function with. | |
* @returns {Number} Returns the timer id. | |
* @example | |
* | |
* var log = _.bind(console.log, console); | |
* _.delay(log, 1000, 'logged later'); | |
* // => 'logged later' (Appears after one second.) | |
*/ | |
function delay(func, wait) { | |
var args = nativeSlice.call(arguments, 2); | |
return setTimeout(function() { func.apply(undefined, args); }, wait); | |
} | |
/** | |
* Creates a function that memoizes the result of `func`. If `resolver` is | |
* passed, it will be used to determine the cache key for storing the result | |
* based on the arguments passed to the memoized function. By default, the first | |
* argument passed to the memoized function is used as the cache key. The `func` | |
* is executed with the `this` binding of the memoized function. The result | |
* cache is exposed as the `cache` property on the memoized function. | |
* | |
* @static | |
* @memberOf _ | |
* @category Functions | |
* @param {Function} func The function to have its output memoized. | |
* @param {Function} [resolver] A function used to resolve the cache key. | |
* @returns {Function} Returns the new memoizing function. | |
* @example | |
* | |
* var fibonacci = _.memoize(function(n) { | |
* return n < 2 ? n : fibonacci(n - 1) + fibonacci(n - 2); | |
* }); | |
*/ | |
function memoize(func, resolver) { | |
function memoized() { | |
var cache = memoized.cache, | |
key = keyPrefix + (resolver ? resolver.apply(this, arguments) : arguments[0]); | |
return hasOwnProperty.call(cache, key) | |
? cache[key] | |
: (cache[key] = func.apply(this, arguments)); | |
} | |
memoized.cache = {}; | |
return memoized; | |
} | |
/** | |
* Creates a function that is restricted to execute `func` once. Repeat calls to | |
* the function will return the value of the first call. The `func` is executed | |
* with the `this` binding of the created function. | |
* | |
* @static | |
* @memberOf _ | |
* @category Functions | |
* @param {Function} func The function to restrict. | |
* @returns {Function} Returns the new restricted function. | |
* @example | |
* | |
* var initialize = _.once(createApplication); | |
* initialize(); | |
* initialize(); | |
* // `initialize` executes `createApplication` once | |
*/ | |
function once(func) { | |
var ran, | |
result; | |
return function() { | |
if (ran) { | |
return result; | |
} | |
ran = true; | |
result = func.apply(this, arguments); | |
// clear the `func` variable so the function may be garbage collected | |
func = null; | |
return result; | |
}; | |
} | |
/** | |
* Creates a function that, when called, invokes `func` with any additional | |
* `partial` arguments prepended to those passed to the new function. This | |
* method is similar to `_.bind`, except it does **not** alter the `this` binding. | |
* | |
* @static | |
* @memberOf _ | |
* @category Functions | |
* @param {Function} func The function to partially apply arguments to. | |
* @param {Mixed} [arg1, arg2, ...] Arguments to be partially applied. | |
* @returns {Function} Returns the new partially applied function. | |
* @example | |
* | |
* var greet = function(greeting, name) { return greeting + ' ' + name; }; | |
* var hi = _.partial(greet, 'hi'); | |
* hi('moe'); | |
* // => 'hi moe' | |
*/ | |
function partial(func) { | |
return createBound(func, nativeSlice.call(arguments, 1)); | |
} | |
/** | |
* This method is similar to `_.partial`, except that `partial` arguments are | |
* appended to those passed to the new function. | |
* | |
* @static | |
* @memberOf _ | |
* @category Functions | |
* @param {Function} func The function to partially apply arguments to. | |
* @param {Mixed} [arg1, arg2, ...] Arguments to be partially applied. | |
* @returns {Function} Returns the new partially applied function. | |
* @example | |
* | |
* var defaultsDeep = _.partialRight(_.merge, _.defaults); | |
* | |
* var options = { | |
* 'variable': 'data', | |
* 'imports': { 'jq': $ } | |
* }; | |
* | |
* defaultsDeep(options, _.templateSettings); | |
* | |
* options.variable | |
* // => 'data' | |
* | |
* options.imports | |
* // => { '_': _, 'jq': $ } | |
*/ | |
function partialRight(func) { | |
return createBound(func, nativeSlice.call(arguments, 1), null, indicatorObject); | |
} | |
/** | |
* Creates a function that, when executed, will only call the `func` function | |
* at most once per every `wait` milliseconds. Pass an `options` object to | |
* indicate that `func` should be invoked on the leading and/or trailing edge | |
* of the `wait` timeout. Subsequent calls to the throttled function will | |
* return the result of the last `func` call. | |
* | |
* Note: If `leading` and `trailing` options are `true`, `func` will be called | |
* on the trailing edge of the timeout only if the the throttled function is | |
* invoked more than once during the `wait` timeout. | |
* | |
* @static | |
* @memberOf _ | |
* @category Functions | |
* @param {Function} func The function to throttle. | |
* @param {Number} wait The number of milliseconds to throttle executions to. | |
* @param {Object} options The options object. | |
* [leading=true] A boolean to specify execution on the leading edge of the timeout. | |
* [trailing=true] A boolean to specify execution on the trailing edge of the timeout. | |
* @returns {Function} Returns the new throttled function. | |
* @example | |
* | |
* var throttled = _.throttle(updatePosition, 100); | |
* jQuery(window).on('scroll', throttled); | |
* | |
* jQuery('.interactive').on('click', _.throttle(renewToken, 300000, { | |
* 'trailing': false | |
* })); | |
*/ | |
function throttle(func, wait, options) { | |
var leading = true, | |
trailing = true; | |
if (options === false) { | |
leading = false; | |
} else if (isObject(options)) { | |
leading = 'leading' in options ? options.leading : leading; | |
trailing = 'trailing' in options ? options.trailing : trailing; | |
} | |
options = getObject(); | |
options.leading = leading; | |
options.maxWait = wait; | |
options.trailing = trailing; | |
var result = debounce(func, wait, options); | |
releaseObject(options); | |
return result; | |
} | |
/** | |
* Creates a function that passes `value` to the `wrapper` function as its | |
* first argument. Additional arguments passed to the function are appended | |
* to those passed to the `wrapper` function. The `wrapper` is executed with | |
* the `this` binding of the created function. | |
* | |
* @static | |
* @memberOf _ | |
* @category Functions | |
* @param {Mixed} value The value to wrap. | |
* @param {Function} wrapper The wrapper function. | |
* @returns {Function} Returns the new function. | |
* @example | |
* | |
* var hello = function(name) { return 'hello ' + name; }; | |
* hello = _.wrap(hello, function(func) { | |
* return 'before, ' + func('moe') + ', after'; | |
* }); | |
* hello(); | |
* // => 'before, hello moe, after' | |
*/ | |
function wrap(value, wrapper) { | |
return function() { | |
var args = [value]; | |
push.apply(args, arguments); | |
return wrapper.apply(this, args); | |
}; | |
} | |
/*--------------------------------------------------------------------------*/ | |
/** | |
* Converts the characters `&`, `<`, `>`, `"`, and `'` in `string` to their | |
* corresponding HTML entities. | |
* | |
* @static | |
* @memberOf _ | |
* @category Utilities | |
* @param {String} string The string to escape. | |
* @returns {String} Returns the escaped string. | |
* @example | |
* | |
* _.escape('Moe, Larry & Curly'); | |
* // => 'Moe, Larry & Curly' | |
*/ | |
function escape(string) { | |
return string == null ? '' : String(string).replace(reUnescapedHtml, escapeHtmlChar); | |
} | |
/** | |
* This method returns the first argument passed to it. | |
* | |
* @static | |
* @memberOf _ | |
* @category Utilities | |
* @param {Mixed} value Any value. | |
* @returns {Mixed} Returns `value`. | |
* @example | |
* | |
* var moe = { 'name': 'moe' }; | |
* moe === _.identity(moe); | |
* // => true | |
*/ | |
function identity(value) { | |
return value; | |
} | |
/** | |
* Adds functions properties of `object` to the `lodash` function and chainable | |
* wrapper. | |
* | |
* @static | |
* @memberOf _ | |
* @category Utilities | |
* @param {Object} object The object of function properties to add to `lodash`. | |
* @example | |
* | |
* _.mixin({ | |
* 'capitalize': function(string) { | |
* return string.charAt(0).toUpperCase() + string.slice(1).toLowerCase(); | |
* } | |
* }); | |
* | |
* _.capitalize('moe'); | |
* // => 'Moe' | |
* | |
* _('moe').capitalize(); | |
* // => 'Moe' | |
*/ | |
function mixin(object) { | |
forEach(functions(object), function(methodName) { | |
var func = lodash[methodName] = object[methodName]; | |
lodash.prototype[methodName] = function() { | |
var value = this.__wrapped__, | |
args = [value]; | |
push.apply(args, arguments); | |
var result = func.apply(lodash, args); | |
return (value && typeof value == 'object' && value === result) | |
? this | |
: new lodashWrapper(result); | |
}; | |
}); | |
} | |
/** | |
* Reverts the '_' variable to its previous value and returns a reference to | |
* the `lodash` function. | |
* | |
* @static | |
* @memberOf _ | |
* @category Utilities | |
* @returns {Function} Returns the `lodash` function. | |
* @example | |
* | |
* var lodash = _.noConflict(); | |
*/ | |
function noConflict() { | |
context._ = oldDash; | |
return this; | |
} | |
/** | |
* Converts the given `value` into an integer of the specified `radix`. | |
* If `radix` is `undefined` or `0`, a `radix` of `10` is used unless the | |
* `value` is a hexadecimal, in which case a `radix` of `16` is used. | |
* | |
* Note: This method avoids differences in native ES3 and ES5 `parseInt` | |
* implementations. See http://es5.github.com/#E. | |
* | |
* @static | |
* @memberOf _ | |
* @category Utilities | |
* @param {String} value The value to parse. | |
* @param {Number} [radix] The radix used to interpret the value to parse. | |
* @returns {Number} Returns the new integer value. | |
* @example | |
* | |
* _.parseInt('08'); | |
* // => 8 | |
*/ | |
var parseInt = nativeParseInt(whitespace + '08') == 8 ? nativeParseInt : function(value, radix) { | |
// Firefox and Opera still follow the ES3 specified implementation of `parseInt` | |
return nativeParseInt(isString(value) ? value.replace(reLeadingSpacesAndZeros, '') : value, radix || 0); | |
}; | |
/** | |
* Produces a random number between `min` and `max` (inclusive). If only one | |
* argument is passed, a number between `0` and the given number will be returned. | |
* | |
* @static | |
* @memberOf _ | |
* @category Utilities | |
* @param {Number} [min=0] The minimum possible value. | |
* @param {Number} [max=1] The maximum possible value. | |
* @returns {Number} Returns a random number. | |
* @example | |
* | |
* _.random(0, 5); | |
* // => a number between 0 and 5 | |
* | |
* _.random(5); | |
* // => also a number between 0 and 5 | |
*/ | |
function random(min, max) { | |
if (min == null && max == null) { | |
max = 1; | |
} | |
min = +min || 0; | |
if (max == null) { | |
max = min; | |
min = 0; | |
} else { | |
max = +max || 0; | |
} | |
var rand = nativeRandom(); | |
return (min % 1 || max % 1) | |
? min + nativeMin(rand * (max - min + parseFloat('1e-' + ((rand +'').length - 1))), max) | |
: min + floor(rand * (max - min + 1)); | |
} | |
/** | |
* Resolves the value of `property` on `object`. If `property` is a function, | |
* it will be invoked with the `this` binding of `object` and its result returned, | |
* else the property value is returned. If `object` is falsey, then `undefined` | |
* is returned. | |
* | |
* @static | |
* @memberOf _ | |
* @category Utilities | |
* @param {Object} object The object to inspect. | |
* @param {String} property The property to get the value of. | |
* @returns {Mixed} Returns the resolved value. | |
* @example | |
* | |
* var object = { | |
* 'cheese': 'crumpets', | |
* 'stuff': function() { | |
* return 'nonsense'; | |
* } | |
* }; | |
* | |
* _.result(object, 'cheese'); | |
* // => 'crumpets' | |
* | |
* _.result(object, 'stuff'); | |
* // => 'nonsense' | |
*/ | |
function result(object, property) { | |
var value = object ? object[property] : undefined; | |
return isFunction(value) ? object[property]() : value; | |
} | |
/** | |
* A micro-templating method that handles arbitrary delimiters, preserves | |
* whitespace, and correctly escapes quotes within interpolated code. | |
* | |
* Note: In the development build, `_.template` utilizes sourceURLs for easier | |
* debugging. See http://www.html5rocks.com/en/tutorials/developertools/sourcemaps/#toc-sourceurl | |
* | |
* For more information on precompiling templates see: | |
* http://lodash.com/#custom-builds | |
* | |
* For more information on Chrome extension sandboxes see: | |
* http://developer.chrome.com/stable/extensions/sandboxingEval.html | |
* | |
* @static | |
* @memberOf _ | |
* @category Utilities | |
* @param {String} text The template text. | |
* @param {Object} data The data object used to populate the text. | |
* @param {Object} options The options object. | |
* escape - The "escape" delimiter regexp. | |
* evaluate - The "evaluate" delimiter regexp. | |
* interpolate - The "interpolate" delimiter regexp. | |
* sourceURL - The sourceURL of the template's compiled source. | |
* variable - The data object variable name. | |
* @returns {Function|String} Returns a compiled function when no `data` object | |
* is given, else it returns the interpolated text. | |
* @example | |
* | |
* // using a compiled template | |
* var compiled = _.template('hello <%= name %>'); | |
* compiled({ 'name': 'moe' }); | |
* // => 'hello moe' | |
* | |
* var list = '<% _.forEach(people, function(name) { %><li><%= name %></li><% }); %>'; | |
* _.template(list, { 'people': ['moe', 'larry'] }); | |
* // => '<li>moe</li><li>larry</li>' | |
* | |
* // using the "escape" delimiter to escape HTML in data property values | |
* _.template('<b><%- value %></b>', { 'value': '<script>' }); | |
* // => '<b><script></b>' | |
* | |
* // using the ES6 delimiter as an alternative to the default "interpolate" delimiter | |
* _.template('hello ${ name }', { 'name': 'curly' }); | |
* // => 'hello curly' | |
* | |
* // using the internal `print` function in "evaluate" delimiters | |
* _.template('<% print("hello " + epithet); %>!', { 'epithet': 'stooge' }); | |
* // => 'hello stooge!' | |
* | |
* // using custom template delimiters | |
* _.templateSettings = { | |
* 'interpolate': /{{([\s\S]+?)}}/g | |
* }; | |
* | |
* _.template('hello {{ name }}!', { 'name': 'mustache' }); | |
* // => 'hello mustache!' | |
* | |
* // using the `sourceURL` option to specify a custom sourceURL for the template | |
* var compiled = _.template('hello <%= name %>', null, { 'sourceURL': '/basic/greeting.jst' }); | |
* compiled(data); | |
* // => find the source of "greeting.jst" under the Sources tab or Resources panel of the web inspector | |
* | |
* // using the `variable` option to ensure a with-statement isn't used in the compiled template | |
* var compiled = _.template('hi <%= data.name %>!', null, { 'variable': 'data' }); | |
* compiled.source; | |
* // => function(data) { | |
* var __t, __p = '', __e = _.escape; | |
* __p += 'hi ' + ((__t = ( data.name )) == null ? '' : __t) + '!'; | |
* return __p; | |
* } | |
* | |
* // using the `source` property to inline compiled templates for meaningful | |
* // line numbers in error messages and a stack trace | |
* fs.writeFileSync(path.join(cwd, 'jst.js'), '\ | |
* var JST = {\ | |
* "main": ' + _.template(mainText).source + '\ | |
* };\ | |
* '); | |
*/ | |
function template(text, data, options) { | |
// based on John Resig's `tmpl` implementation | |
// http://ejohn.org/blog/javascript-micro-templating/ | |
// and Laura Doktorova's doT.js | |
// https://github.com/olado/doT | |
var settings = lodash.templateSettings; | |
text || (text = ''); | |
// avoid missing dependencies when `iteratorTemplate` is not defined | |
options = defaults({}, options, settings); | |
var imports = defaults({}, options.imports, settings.imports), | |
importsKeys = keys(imports), | |
importsValues = values(imports); | |
var isEvaluating, | |
index = 0, | |
interpolate = options.interpolate || reNoMatch, | |
source = "__p += '"; | |
// compile the regexp to match each delimiter | |
var reDelimiters = RegExp( | |
(options.escape || reNoMatch).source + '|' + | |
interpolate.source + '|' + | |
(interpolate === reInterpolate ? reEsTemplate : reNoMatch).source + '|' + | |
(options.evaluate || reNoMatch).source + '|$' | |
, 'g'); | |
text.replace(reDelimiters, function(match, escapeValue, interpolateValue, esTemplateValue, evaluateValue, offset) { | |
interpolateValue || (interpolateValue = esTemplateValue); | |
// escape characters that cannot be included in string literals | |
source += text.slice(index, offset).replace(reUnescapedString, escapeStringChar); | |
// replace delimiters with snippets | |
if (escapeValue) { | |
source += "' +\n__e(" + escapeValue + ") +\n'"; | |
} | |
if (evaluateValue) { | |
isEvaluating = true; | |
source += "';\n" + evaluateValue + ";\n__p += '"; | |
} | |
if (interpolateValue) { | |
source += "' +\n((__t = (" + interpolateValue + ")) == null ? '' : __t) +\n'"; | |
} | |
index = offset + match.length; | |
// the JS engine embedded in Adobe products requires returning the `match` | |
// string in order to produce the correct `offset` value | |
return match; | |
}); | |
source += "';\n"; | |
// if `variable` is not specified, wrap a with-statement around the generated | |
// code to add the data object to the top of the scope chain | |
var variable = options.variable, | |
hasVariable = variable; | |
if (!hasVariable) { | |
variable = 'obj'; | |
source = 'with (' + variable + ') {\n' + source + '\n}\n'; | |
} | |
// cleanup code by stripping empty strings | |
source = (isEvaluating ? source.replace(reEmptyStringLeading, '') : source) | |
.replace(reEmptyStringMiddle, '$1') | |
.replace(reEmptyStringTrailing, '$1;'); | |
// frame code as the function body | |
source = 'function(' + variable + ') {\n' + | |
(hasVariable ? '' : variable + ' || (' + variable + ' = {});\n') + | |
"var __t, __p = '', __e = _.escape" + | |
(isEvaluating | |
? ', __j = Array.prototype.join;\n' + | |
"function print() { __p += __j.call(arguments, '') }\n" | |
: ';\n' | |
) + | |
source + | |
'return __p\n}'; | |
// Use a sourceURL for easier debugging and wrap in a multi-line comment to | |
// avoid issues with Narwhal, IE conditional compilation, and the JS engine | |
// embedded in Adobe products. | |
// http://www.html5rocks.com/en/tutorials/developertools/sourcemaps/#toc-sourceurl | |
var sourceURL = '\n/*\n//@ sourceURL=' + (options.sourceURL || '/lodash/template/source[' + (templateCounter++) + ']') + '\n*/'; | |
try { | |
var result = Function(importsKeys, 'return ' + source + sourceURL).apply(undefined, importsValues); | |
} catch(e) { | |
e.source = source; | |
throw e; | |
} | |
if (data) { | |
return result(data); | |
} | |
// provide the compiled function's source via its `toString` method, in | |
// supported environments, or the `source` property as a convenience for | |
// inlining compiled templates during the build process | |
result.source = source; | |
return result; | |
} | |
/** | |
* Executes the `callback` function `n` times, returning an array of the results | |
* of each `callback` execution. The `callback` is bound to `thisArg` and invoked | |
* with one argument; (index). | |
* | |
* @static | |
* @memberOf _ | |
* @category Utilities | |
* @param {Number} n The number of times to execute the callback. | |
* @param {Function} callback The function called per iteration. | |
* @param {Mixed} [thisArg] The `this` binding of `callback`. | |
* @returns {Array} Returns a new array of the results of each `callback` execution. | |
* @example | |
* | |
* var diceRolls = _.times(3, _.partial(_.random, 1, 6)); | |
* // => [3, 6, 4] | |
* | |
* _.times(3, function(n) { mage.castSpell(n); }); | |
* // => calls `mage.castSpell(n)` three times, passing `n` of `0`, `1`, and `2` respectively | |
* | |
* _.times(3, function(n) { this.cast(n); }, mage); | |
* // => also calls `mage.castSpell(n)` three times | |
*/ | |
function times(n, callback, thisArg) { | |
n = (n = +n) > -1 ? n : 0; | |
var index = -1, | |
result = Array(n); | |
callback = lodash.createCallback(callback, thisArg, 1); | |
while (++index < n) { | |
result[index] = callback(index); | |
} | |
return result; | |
} | |
/** | |
* The inverse of `_.escape`, this method converts the HTML entities | |
* `&`, `<`, `>`, `"`, and `'` in `string` to their | |
* corresponding characters. | |
* | |
* @static | |
* @memberOf _ | |
* @category Utilities | |
* @param {String} string The string to unescape. | |
* @returns {String} Returns the unescaped string. | |
* @example | |
* | |
* _.unescape('Moe, Larry & Curly'); | |
* // => 'Moe, Larry & Curly' | |
*/ | |
function unescape(string) { | |
return string == null ? '' : String(string).replace(reEscapedHtml, unescapeHtmlChar); | |
} | |
/** | |
* Generates a unique ID. If `prefix` is passed, the ID will be appended to it. | |
* | |
* @static | |
* @memberOf _ | |
* @category Utilities | |
* @param {String} [prefix] The value to prefix the ID with. | |
* @returns {String} Returns the unique ID. | |
* @example | |
* | |
* _.uniqueId('contact_'); | |
* // => 'contact_104' | |
* | |
* _.uniqueId(); | |
* // => '105' | |
*/ | |
function uniqueId(prefix) { | |
var id = ++idCounter; | |
return String(prefix == null ? '' : prefix) + id; | |
} | |
/*--------------------------------------------------------------------------*/ | |
/** | |
* Invokes `interceptor` with the `value` as the first argument, and then | |
* returns `value`. The purpose of this method is to "tap into" a method chain, | |
* in order to perform operations on intermediate results within the chain. | |
* | |
* @static | |
* @memberOf _ | |
* @category Chaining | |
* @param {Mixed} value The value to pass to `interceptor`. | |
* @param {Function} interceptor The function to invoke. | |
* @returns {Mixed} Returns `value`. | |
* @example | |
* | |
* _([1, 2, 3, 4]) | |
* .filter(function(num) { return num % 2 == 0; }) | |
* .tap(alert) | |
* .map(function(num) { return num * num; }) | |
* .value(); | |
* // => // [2, 4] (alerted) | |
* // => [4, 16] | |
*/ | |
function tap(value, interceptor) { | |
interceptor(value); | |
return value; | |
} | |
/** | |
* Produces the `toString` result of the wrapped value. | |
* | |
* @name toString | |
* @memberOf _ | |
* @category Chaining | |
* @returns {String} Returns the string result. | |
* @example | |
* | |
* _([1, 2, 3]).toString(); | |
* // => '1,2,3' | |
*/ | |
function wrapperToString() { | |
return String(this.__wrapped__); | |
} | |
/** | |
* Extracts the wrapped value. | |
* | |
* @name valueOf | |
* @memberOf _ | |
* @alias value | |
* @category Chaining | |
* @returns {Mixed} Returns the wrapped value. | |
* @example | |
* | |
* _([1, 2, 3]).valueOf(); | |
* // => [1, 2, 3] | |
*/ | |
function wrapperValueOf() { | |
return this.__wrapped__; | |
} | |
/*--------------------------------------------------------------------------*/ | |
// add functions that return wrapped values when chaining | |
lodash.after = after; | |
lodash.assign = assign; | |
lodash.at = at; | |
lodash.bind = bind; | |
lodash.bindAll = bindAll; | |
lodash.bindKey = bindKey; | |
lodash.compact = compact; | |
lodash.compose = compose; | |
lodash.countBy = countBy; | |
lodash.createCallback = createCallback; | |
lodash.debounce = debounce; | |
lodash.defaults = defaults; | |
lodash.defer = defer; | |
lodash.delay = delay; | |
lodash.difference = difference; | |
lodash.filter = filter; | |
lodash.flatten = flatten; | |
lodash.forEach = forEach; | |
lodash.forIn = forIn; | |
lodash.forOwn = forOwn; | |
lodash.functions = functions; | |
lodash.groupBy = groupBy; | |
lodash.initial = initial; | |
lodash.intersection = intersection; | |
lodash.invert = invert; | |
lodash.invoke = invoke; | |
lodash.keys = keys; | |
lodash.map = map; | |
lodash.max = max; | |
lodash.memoize = memoize; | |
lodash.merge = merge; | |
lodash.min = min; | |
lodash.omit = omit; | |
lodash.once = once; | |
lodash.pairs = pairs; | |
lodash.partial = partial; | |
lodash.partialRight = partialRight; | |
lodash.pick = pick; | |
lodash.pluck = pluck; | |
lodash.range = range; | |
lodash.reject = reject; | |
lodash.rest = rest; | |
lodash.shuffle = shuffle; | |
lodash.sortBy = sortBy; | |
lodash.tap = tap; | |
lodash.throttle = throttle; | |
lodash.times = times; | |
lodash.toArray = toArray; | |
lodash.transform = transform; | |
lodash.union = union; | |
lodash.uniq = uniq; | |
lodash.unzip = unzip; | |
lodash.values = values; | |
lodash.where = where; | |
lodash.without = without; | |
lodash.wrap = wrap; | |
lodash.zip = zip; | |
lodash.zipObject = zipObject; | |
// add aliases | |
lodash.collect = map; | |
lodash.drop = rest; | |
lodash.each = forEach; | |
lodash.extend = assign; | |
lodash.methods = functions; | |
lodash.object = zipObject; | |
lodash.select = filter; | |
lodash.tail = rest; | |
lodash.unique = uniq; | |
// add functions to `lodash.prototype` | |
mixin(lodash); | |
// add Underscore compat | |
lodash.chain = lodash; | |
lodash.prototype.chain = function() { return this; }; | |
/*--------------------------------------------------------------------------*/ | |
// add functions that return unwrapped values when chaining | |
lodash.clone = clone; | |
lodash.cloneDeep = cloneDeep; | |
lodash.contains = contains; | |
lodash.escape = escape; | |
lodash.every = every; | |
lodash.find = find; | |
lodash.findIndex = findIndex; | |
lodash.findKey = findKey; | |
lodash.has = has; | |
lodash.identity = identity; | |
lodash.indexOf = indexOf; | |
lodash.isArguments = isArguments; | |
lodash.isArray = isArray; | |
lodash.isBoolean = isBoolean; | |
lodash.isDate = isDate; | |
lodash.isElement = isElement; | |
lodash.isEmpty = isEmpty; | |
lodash.isEqual = isEqual; | |
lodash.isFinite = isFinite; | |
lodash.isFunction = isFunction; | |
lodash.isNaN = isNaN; | |
lodash.isNull = isNull; | |
lodash.isNumber = isNumber; | |
lodash.isObject = isObject; | |
lodash.isPlainObject = isPlainObject; | |
lodash.isRegExp = isRegExp; | |
lodash.isString = isString; | |
lodash.isUndefined = isUndefined; | |
lodash.lastIndexOf = lastIndexOf; | |
lodash.mixin = mixin; | |
lodash.noConflict = noConflict; | |
lodash.parseInt = parseInt; | |
lodash.random = random; | |
lodash.reduce = reduce; | |
lodash.reduceRight = reduceRight; | |
lodash.result = result; | |
lodash.runInContext = runInContext; | |
lodash.size = size; | |
lodash.some = some; | |
lodash.sortedIndex = sortedIndex; | |
lodash.template = template; | |
lodash.unescape = unescape; | |
lodash.uniqueId = uniqueId; | |
// add aliases | |
lodash.all = every; | |
lodash.any = some; | |
lodash.detect = find; | |
lodash.findWhere = find; | |
lodash.foldl = reduce; | |
lodash.foldr = reduceRight; | |
lodash.include = contains; | |
lodash.inject = reduce; | |
forOwn(lodash, function(func, methodName) { | |
if (!lodash.prototype[methodName]) { | |
lodash.prototype[methodName] = function() { | |
var args = [this.__wrapped__]; | |
push.apply(args, arguments); | |
return func.apply(lodash, args); | |
}; | |
} | |
}); | |
/*--------------------------------------------------------------------------*/ | |
// add functions capable of returning wrapped and unwrapped values when chaining | |
lodash.first = first; | |
lodash.last = last; | |
// add aliases | |
lodash.take = first; | |
lodash.head = first; | |
forOwn(lodash, function(func, methodName) { | |
if (!lodash.prototype[methodName]) { | |
lodash.prototype[methodName]= function(callback, thisArg) { | |
var result = func(this.__wrapped__, callback, thisArg); | |
return callback == null || (thisArg && typeof callback != 'function') | |
? result | |
: new lodashWrapper(result); | |
}; | |
} | |
}); | |
/*--------------------------------------------------------------------------*/ | |
/** | |
* The semantic version number. | |
* | |
* @static | |
* @memberOf _ | |
* @type String | |
*/ | |
lodash.VERSION = '1.3.1'; | |
// add "Chaining" functions to the wrapper | |
lodash.prototype.toString = wrapperToString; | |
lodash.prototype.value = wrapperValueOf; | |
lodash.prototype.valueOf = wrapperValueOf; | |
// add `Array` functions that return unwrapped values | |
forEach(['join', 'pop', 'shift'], function(methodName) { | |
var func = arrayRef[methodName]; | |
lodash.prototype[methodName] = function() { | |
return func.apply(this.__wrapped__, arguments); | |
}; | |
}); | |
// add `Array` functions that return the wrapped value | |
forEach(['push', 'reverse', 'sort', 'unshift'], function(methodName) { | |
var func = arrayRef[methodName]; | |
lodash.prototype[methodName] = function() { | |
func.apply(this.__wrapped__, arguments); | |
return this; | |
}; | |
}); | |
// add `Array` functions that return new wrapped values | |
forEach(['concat', 'slice', 'splice'], function(methodName) { | |
var func = arrayRef[methodName]; | |
lodash.prototype[methodName] = function() { | |
return new lodashWrapper(func.apply(this.__wrapped__, arguments)); | |
}; | |
}); | |
return lodash; | |
} | |
/*--------------------------------------------------------------------------*/ | |
// expose Lo-Dash | |
var _ = runInContext(); | |
// some AMD build optimizers, like r.js, check for specific condition patterns like the following: | |
if (typeof define == 'function' && typeof define.amd == 'object' && define.amd) { | |
// Expose Lo-Dash to the global object even when an AMD loader is present in | |
// case Lo-Dash was injected by a third-party script and not intended to be | |
// loaded as a module. The global assignment can be reverted in the Lo-Dash | |
// module via its `noConflict()` method. | |
window._ = _; | |
// define as an anonymous module so, through path mapping, it can be | |
// referenced as the "underscore" module | |
define(function() { | |
return _; | |
}); | |
} | |
// check for `exports` after `define` in case a build optimizer adds an `exports` object | |
else if (freeExports && !freeExports.nodeType) { | |
// in Node.js or RingoJS v0.8.0+ | |
if (freeModule) { | |
(freeModule.exports = _)._ = _; | |
} | |
// in Narwhal or RingoJS v0.7.0- | |
else { | |
freeExports._ = _; | |
} | |
} | |
else { | |
// in a browser or Rhino | |
window._ = _; | |
} | |
}(this)); | |
})(self) | |
},{}]},{},[]) | |
//@ 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* @license\n * Lo-Dash 1.3.1 (Custom Build) <http://lodash.com/>\n * Build: `lodash modern -o ./dist/lodash.js`\n * Copyright 2012-2013 The Dojo Foundation <http://dojofoundation.org/>\n * Based on Underscore.js 1.4.4 <http://underscorejs.org/>\n * Copyright 2009-2013 Jeremy Ashkenas, DocumentCloud Inc.\n * Available under MIT license <http://lodash.com/license>\n */\n;(function(window) {\n\n  /** Used as a safe reference for `undefined` in pre ES5 environments */\n  var undefined;\n\n  /** Used to pool arrays and objects used internally */\n  var arrayPool = [],\n      objectPool = [];\n\n  /** Used to generate unique IDs */\n  var idCounter = 0;\n\n  /** Used internally to indicate various things */\n  var indicatorObject = {};\n\n  /** Used to prefix keys to avoid issues with `__proto__` and properties on `Object.prototype` */\n  var keyPrefix = +new Date + '';\n\n  /** Used as the size when optimizations are enabled for large arrays */\n  var largeArraySize = 75;\n\n  /** Used as the max size of the `arrayPool` and `objectPool` */\n  var maxPoolSize = 40;\n\n  /** Used to match empty string literals in compiled template source */\n  var reEmptyStringLeading = /\\b__p \\+= '';/g,\n      reEmptyStringMiddle = /\\b(__p \\+=) '' \\+/g,\n      reEmptyStringTrailing = /(__e\\(.*?\\)|\\b__t\\)) \\+\\n'';/g;\n\n  /** Used to match HTML entities */\n  var reEscapedHtml = /&(?:amp|lt|gt|quot|#39);/g;\n\n  /**\n   * Used to match ES6 template delimiters\n   * http://people.mozilla.org/~jorendorff/es6-draft.html#sec-7.8.6\n   */\n  var reEsTemplate = /\\$\\{([^\\\\}]*(?:\\\\.[^\\\\}]*)*)\\}/g;\n\n  /** Used to match regexp flags from their coerced string values */\n  var reFlags = /\\w*$/;\n\n  /** Used to match \"interpolate\" template delimiters */\n  var reInterpolate = /<%=([\\s\\S]+?)%>/g;\n\n  /** Used to detect functions containing a `this` reference */\n  var reThis = (reThis = /\\bthis\\b/) && reThis.test(runInContext) && reThis;\n\n  /** Used to detect and test whitespace */\n  var whitespace = (\n    // whitespace\n    ' \\t\\x0B\\f\\xA0\\ufeff' +\n\n    // line terminators\n    '\\n\\r\\u2028\\u2029' +\n\n    // unicode category \"Zs\" space separators\n    '\\u1680\\u180e\\u2000\\u2001\\u2002\\u2003\\u2004\\u2005\\u2006\\u2007\\u2008\\u2009\\u200a\\u202f\\u205f\\u3000'\n  );\n\n  /** Used to match leading whitespace and zeros to be removed */\n  var reLeadingSpacesAndZeros = RegExp('^[' + whitespace + ']*0+(?=.$)');\n\n  /** Used to ensure capturing order of template delimiters */\n  var reNoMatch = /($^)/;\n\n  /** Used to match HTML characters */\n  var reUnescapedHtml = /[&<>\"']/g;\n\n  /** Used to match unescaped characters in compiled string literals */\n  var reUnescapedString = /['\\n\\r\\t\\u2028\\u2029\\\\]/g;\n\n  /** Used to assign default `context` object properties */\n  var contextProps = [\n    'Array', 'Boolean', 'Date', 'Function', 'Math', 'Number', 'Object',\n    'RegExp', 'String', '_', 'attachEvent', 'clearTimeout', 'isFinite', 'isNaN',\n    'parseInt', 'setImmediate', 'setTimeout'\n  ];\n\n  /** Used to make template sourceURLs easier to identify */\n  var templateCounter = 0;\n\n  /** `Object#toString` result shortcuts */\n  var argsClass = '[object Arguments]',\n      arrayClass = '[object Array]',\n      boolClass = '[object Boolean]',\n      dateClass = '[object Date]',\n      errorClass = '[object Error]',\n      funcClass = '[object Function]',\n      numberClass = '[object Number]',\n      objectClass = '[object Object]',\n      regexpClass = '[object RegExp]',\n      stringClass = '[object String]';\n\n  /** Used to identify object classifications that `_.clone` supports */\n  var cloneableClasses = {};\n  cloneableClasses[funcClass] = false;\n  cloneableClasses[argsClass] = cloneableClasses[arrayClass] =\n  cloneableClasses[boolClass] = cloneableClasses[dateClass] =\n  cloneableClasses[numberClass] = cloneableClasses[objectClass] =\n  cloneableClasses[regexpClass] = cloneableClasses[stringClass] = true;\n\n  /** Used to determine if values are of the language type Object */\n  var objectTypes = {\n    'boolean': false,\n    'function': true,\n    'object': true,\n    'number': false,\n    'string': false,\n    'undefined': false\n  };\n\n  /** Used to escape characters for inclusion in compiled string literals */\n  var stringEscapes = {\n    '\\\\': '\\\\',\n    \"'\": \"'\",\n    '\\n': 'n',\n    '\\r': 'r',\n    '\\t': 't',\n    '\\u2028': 'u2028',\n    '\\u2029': 'u2029'\n  };\n\n  /** Detect free variable `exports` */\n  var freeExports = objectTypes[typeof exports] && exports;\n\n  /** Detect free variable `module` */\n  var freeModule = objectTypes[typeof module] && module && module.exports == freeExports && module;\n\n  /** Detect free variable `global`, from Node.js or Browserified code, and use it as `window` */\n  var freeGlobal = objectTypes[typeof global] && global;\n  if (freeGlobal && (freeGlobal.global === freeGlobal || freeGlobal.window === freeGlobal)) {\n    window = freeGlobal;\n  }\n\n  /*--------------------------------------------------------------------------*/\n\n  /**\n   * A basic implementation of `_.indexOf` without support for binary searches\n   * or `fromIndex` constraints.\n   *\n   * @private\n   * @param {Array} array The array to search.\n   * @param {Mixed} value The value to search for.\n   * @param {Number} [fromIndex=0] The index to search from.\n   * @returns {Number} Returns the index of the matched value or `-1`.\n   */\n  function basicIndexOf(array, value, fromIndex) {\n    var index = (fromIndex || 0) - 1,\n        length = array.length;\n\n    while (++index < length) {\n      if (array[index] === value) {\n        return index;\n      }\n    }\n    return -1;\n  }\n\n  /**\n   * An implementation of `_.contains` for cache objects that mimics the return\n   * signature of `_.indexOf` by returning `0` if the value is found, else `-1`.\n   *\n   * @private\n   * @param {Object} cache The cache object to inspect.\n   * @param {Mixed} value The value to search for.\n   * @returns {Number} Returns `0` if `value` is found, else `-1`.\n   */\n  function cacheIndexOf(cache, value) {\n    var type = typeof value;\n    cache = cache.cache;\n\n    if (type == 'boolean' || value == null) {\n      return cache[value];\n    }\n    if (type != 'number' && type != 'string') {\n      type = 'object';\n    }\n    var key = type == 'number' ? value : keyPrefix + value;\n    cache = cache[type] || (cache[type] = {});\n\n    return type == 'object'\n      ? (cache[key] && basicIndexOf(cache[key], value) > -1 ? 0 : -1)\n      : (cache[key] ? 0 : -1);\n  }\n\n  /**\n   * Adds a given `value` to the corresponding cache object.\n   *\n   * @private\n   * @param {Mixed} value The value to add to the cache.\n   */\n  function cachePush(value) {\n    var cache = this.cache,\n        type = typeof value;\n\n    if (type == 'boolean' || value == null) {\n      cache[value] = true;\n    } else {\n      if (type != 'number' && type != 'string') {\n        type = 'object';\n      }\n      var key = type == 'number' ? value : keyPrefix + value,\n          typeCache = cache[type] || (cache[type] = {});\n\n      if (type == 'object') {\n        if ((typeCache[key] || (typeCache[key] = [])).push(value) == this.array.length) {\n          cache[type] = false;\n        }\n      } else {\n        typeCache[key] = true;\n      }\n    }\n  }\n\n  /**\n   * Used by `_.max` and `_.min` as the default `callback` when a given\n   * `collection` is a string value.\n   *\n   * @private\n   * @param {String} value The character to inspect.\n   * @returns {Number} Returns the code unit of given character.\n   */\n  function charAtCallback(value) {\n    return value.charCodeAt(0);\n  }\n\n  /**\n   * Used by `sortBy` to compare transformed `collection` values, stable sorting\n   * them in ascending order.\n   *\n   * @private\n   * @param {Object} a The object to compare to `b`.\n   * @param {Object} b The object to compare to `a`.\n   * @returns {Number} Returns the sort order indicator of `1` or `-1`.\n   */\n  function compareAscending(a, b) {\n    var ai = a.index,\n        bi = b.index;\n\n    a = a.criteria;\n    b = b.criteria;\n\n    // ensure a stable sort in V8 and other engines\n    // http://code.google.com/p/v8/issues/detail?id=90\n    if (a !== b) {\n      if (a > b || typeof a == 'undefined') {\n        return 1;\n      }\n      if (a < b || typeof b == 'undefined') {\n        return -1;\n      }\n    }\n    return ai < bi ? -1 : 1;\n  }\n\n  /**\n   * Creates a cache object to optimize linear searches of large arrays.\n   *\n   * @private\n   * @param {Array} [array=[]] The array to search.\n   * @returns {Null|Object} Returns the cache object or `null` if caching should not be used.\n   */\n  function createCache(array) {\n    var index = -1,\n        length = array.length;\n\n    var cache = getObject();\n    cache['false'] = cache['null'] = cache['true'] = cache['undefined'] = false;\n\n    var result = getObject();\n    result.array = array;\n    result.cache = cache;\n    result.push = cachePush;\n\n    while (++index < length) {\n      result.push(array[index]);\n    }\n    return cache.object === false\n      ? (releaseObject(result), null)\n      : result;\n  }\n\n  /**\n   * Used by `template` to escape characters for inclusion in compiled\n   * string literals.\n   *\n   * @private\n   * @param {String} match The matched character to escape.\n   * @returns {String} Returns the escaped character.\n   */\n  function escapeStringChar(match) {\n    return '\\\\' + stringEscapes[match];\n  }\n\n  /**\n   * Gets an array from the array pool or creates a new one if the pool is empty.\n   *\n   * @private\n   * @returns {Array} The array from the pool.\n   */\n  function getArray() {\n    return arrayPool.pop() || [];\n  }\n\n  /**\n   * Gets an object from the object pool or creates a new one if the pool is empty.\n   *\n   * @private\n   * @returns {Object} The object from the pool.\n   */\n  function getObject() {\n    return objectPool.pop() || {\n      'array': null,\n      'cache': null,\n      'criteria': null,\n      'false': false,\n      'index': 0,\n      'leading': false,\n      'maxWait': 0,\n      'null': false,\n      'number': null,\n      'object': null,\n      'push': null,\n      'string': null,\n      'trailing': false,\n      'true': false,\n      'undefined': false,\n      'value': null\n    };\n  }\n\n  /**\n   * A no-operation function.\n   *\n   * @private\n   */\n  function noop() {\n    // no operation performed\n  }\n\n  /**\n   * Releases the given `array` back to the array pool.\n   *\n   * @private\n   * @param {Array} [array] The array to release.\n   */\n  function releaseArray(array) {\n    array.length = 0;\n    if (arrayPool.length < maxPoolSize) {\n      arrayPool.push(array);\n    }\n  }\n\n  /**\n   * Releases the given `object` back to the object pool.\n   *\n   * @private\n   * @param {Object} [object] The object to release.\n   */\n  function releaseObject(object) {\n    var cache = object.cache;\n    if (cache) {\n      releaseObject(cache);\n    }\n    object.array = object.cache = object.criteria = object.object = object.number = object.string = object.value = null;\n    if (objectPool.length < maxPoolSize) {\n      objectPool.push(object);\n    }\n  }\n\n  /**\n   * Slices the `collection` from the `start` index up to, but not including,\n   * the `end` index.\n   *\n   * Note: This function is used, instead of `Array#slice`, to support node lists\n   * in IE < 9 and to ensure dense arrays are returned.\n   *\n   * @private\n   * @param {Array|Object|String} collection The collection to slice.\n   * @param {Number} start The start index.\n   * @param {Number} end The end index.\n   * @returns {Array} Returns the new array.\n   */\n  function slice(array, start, end) {\n    start || (start = 0);\n    if (typeof end == 'undefined') {\n      end = array ? array.length : 0;\n    }\n    var index = -1,\n        length = end - start || 0,\n        result = Array(length < 0 ? 0 : length);\n\n    while (++index < length) {\n      result[index] = array[start + index];\n    }\n    return result;\n  }\n\n  /*--------------------------------------------------------------------------*/\n\n  /**\n   * Create a new `lodash` function using the given `context` object.\n   *\n   * @static\n   * @memberOf _\n   * @category Utilities\n   * @param {Object} [context=window] The context object.\n   * @returns {Function} Returns the `lodash` function.\n   */\n  function runInContext(context) {\n    // Avoid issues with some ES3 environments that attempt to use values, named\n    // after built-in constructors like `Object`, for the creation of literals.\n    // ES5 clears this up by stating that literals must use built-in constructors.\n    // See http://es5.github.com/#x11.1.5.\n    context = context ? _.defaults(window.Object(), context, _.pick(window, contextProps)) : window;\n\n    /** Native constructor references */\n    var Array = context.Array,\n        Boolean = context.Boolean,\n        Date = context.Date,\n        Function = context.Function,\n        Math = context.Math,\n        Number = context.Number,\n        Object = context.Object,\n        RegExp = context.RegExp,\n        String = context.String,\n        TypeError = context.TypeError;\n\n    /**\n     * Used for `Array` method references.\n     *\n     * Normally `Array.prototype` would suffice, however, using an array literal\n     * avoids issues in Narwhal.\n     */\n    var arrayRef = [];\n\n    /** Used for native method references */\n    var objectProto = Object.prototype,\n        stringProto = String.prototype;\n\n    /** Used to restore the original `_` reference in `noConflict` */\n    var oldDash = context._;\n\n    /** Used to detect if a method is native */\n    var reNative = RegExp('^' +\n      String(objectProto.valueOf)\n        .replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\$&')\n        .replace(/valueOf|for [^\\]]+/g, '.+?') + '$'\n    );\n\n    /** Native method shortcuts */\n    var ceil = Math.ceil,\n        clearTimeout = context.clearTimeout,\n        concat = arrayRef.concat,\n        floor = Math.floor,\n        fnToString = Function.prototype.toString,\n        getPrototypeOf = reNative.test(getPrototypeOf = Object.getPrototypeOf) && getPrototypeOf,\n        hasOwnProperty = objectProto.hasOwnProperty,\n        push = arrayRef.push,\n        propertyIsEnumerable = objectProto.propertyIsEnumerable,\n        setImmediate = context.setImmediate,\n        setTimeout = context.setTimeout,\n        toString = objectProto.toString;\n\n    /* Native method shortcuts for methods with the same name as other `lodash` methods */\n    var nativeBind = reNative.test(nativeBind = toString.bind) && nativeBind,\n        nativeCreate = reNative.test(nativeCreate =  Object.create) && nativeCreate,\n        nativeIsArray = reNative.test(nativeIsArray = Array.isArray) && nativeIsArray,\n        nativeIsFinite = context.isFinite,\n        nativeIsNaN = context.isNaN,\n        nativeKeys = reNative.test(nativeKeys = Object.keys) && nativeKeys,\n        nativeMax = Math.max,\n        nativeMin = Math.min,\n        nativeParseInt = context.parseInt,\n        nativeRandom = Math.random,\n        nativeSlice = arrayRef.slice;\n\n    /** Detect various environments */\n    var isIeOpera = reNative.test(context.attachEvent),\n        isV8 = nativeBind && !/\\n|true/.test(nativeBind + isIeOpera);\n\n    /** Used to lookup a built-in constructor by [[Class]] */\n    var ctorByClass = {};\n    ctorByClass[arrayClass] = Array;\n    ctorByClass[boolClass] = Boolean;\n    ctorByClass[dateClass] = Date;\n    ctorByClass[funcClass] = Function;\n    ctorByClass[objectClass] = Object;\n    ctorByClass[numberClass] = Number;\n    ctorByClass[regexpClass] = RegExp;\n    ctorByClass[stringClass] = String;\n\n    /*--------------------------------------------------------------------------*/\n\n    /**\n     * Creates a `lodash` object, which wraps the given `value`, to enable method\n     * chaining.\n     *\n     * In addition to Lo-Dash methods, wrappers also have the following `Array` methods:\n     * `concat`, `join`, `pop`, `push`, `reverse`, `shift`, `slice`, `sort`, `splice`,\n     * and `unshift`\n     *\n     * Chaining is supported in custom builds as long as the `value` method is\n     * implicitly or explicitly included in the build.\n     *\n     * The chainable wrapper functions are:\n     * `after`, `assign`, `bind`, `bindAll`, `bindKey`, `chain`, `compact`,\n     * `compose`, `concat`, `countBy`, `createCallback`, `debounce`, `defaults`,\n     * `defer`, `delay`, `difference`, `filter`, `flatten`, `forEach`, `forIn`,\n     * `forOwn`, `functions`, `groupBy`, `initial`, `intersection`, `invert`,\n     * `invoke`, `keys`, `map`, `max`, `memoize`, `merge`, `min`, `object`, `omit`,\n     * `once`, `pairs`, `partial`, `partialRight`, `pick`, `pluck`, `push`, `range`,\n     * `reject`, `rest`, `reverse`, `shuffle`, `slice`, `sort`, `sortBy`, `splice`,\n     * `tap`, `throttle`, `times`, `toArray`, `transform`, `union`, `uniq`, `unshift`,\n     * `unzip`, `values`, `where`, `without`, `wrap`, and `zip`\n     *\n     * The non-chainable wrapper functions are:\n     * `clone`, `cloneDeep`, `contains`, `escape`, `every`, `find`, `has`,\n     * `identity`, `indexOf`, `isArguments`, `isArray`, `isBoolean`, `isDate`,\n     * `isElement`, `isEmpty`, `isEqual`, `isFinite`, `isFunction`, `isNaN`,\n     * `isNull`, `isNumber`, `isObject`, `isPlainObject`, `isRegExp`, `isString`,\n     * `isUndefined`, `join`, `lastIndexOf`, `mixin`, `noConflict`, `parseInt`,\n     * `pop`, `random`, `reduce`, `reduceRight`, `result`, `shift`, `size`, `some`,\n     * `sortedIndex`, `runInContext`, `template`, `unescape`, `uniqueId`, and `value`\n     *\n     * The wrapper functions `first` and `last` return wrapped values when `n` is\n     * passed, otherwise they return unwrapped values.\n     *\n     * @name _\n     * @constructor\n     * @alias chain\n     * @category Chaining\n     * @param {Mixed} value The value to wrap in a `lodash` instance.\n     * @returns {Object} Returns a `lodash` instance.\n     * @example\n     *\n     * var wrapped = _([1, 2, 3]);\n     *\n     * // returns an unwrapped value\n     * wrapped.reduce(function(sum, num) {\n     *   return sum + num;\n     * });\n     * // => 6\n     *\n     * // returns a wrapped value\n     * var squares = wrapped.map(function(num) {\n     *   return num * num;\n     * });\n     *\n     * _.isArray(squares);\n     * // => false\n     *\n     * _.isArray(squares.value());\n     * // => true\n     */\n    function lodash(value) {\n      // don't wrap if already wrapped, even if wrapped by a different `lodash` constructor\n      return (value && typeof value == 'object' && !isArray(value) && hasOwnProperty.call(value, '__wrapped__'))\n       ? value\n       : new lodashWrapper(value);\n    }\n\n    /**\n     * A fast path for creating `lodash` wrapper objects.\n     *\n     * @private\n     * @param {Mixed} value The value to wrap in a `lodash` instance.\n     * @returns {Object} Returns a `lodash` instance.\n     */\n    function lodashWrapper(value) {\n      this.__wrapped__ = value;\n    }\n    // ensure `new lodashWrapper` is an instance of `lodash`\n    lodashWrapper.prototype = lodash.prototype;\n\n    /**\n     * An object used to flag environments features.\n     *\n     * @static\n     * @memberOf _\n     * @type Object\n     */\n    var support = lodash.support = {};\n\n    /**\n     * Detect if `Function#bind` exists and is inferred to be fast (all but V8).\n     *\n     * @memberOf _.support\n     * @type Boolean\n     */\n    support.fastBind = nativeBind && !isV8;\n\n    /**\n     * By default, the template delimiters used by Lo-Dash are similar to those in\n     * embedded Ruby (ERB). Change the following template settings to use alternative\n     * delimiters.\n     *\n     * @static\n     * @memberOf _\n     * @type Object\n     */\n    lodash.templateSettings = {\n\n      /**\n       * Used to detect `data` property values to be HTML-escaped.\n       *\n       * @memberOf _.templateSettings\n       * @type RegExp\n       */\n      'escape': /<%-([\\s\\S]+?)%>/g,\n\n      /**\n       * Used to detect code to be evaluated.\n       *\n       * @memberOf _.templateSettings\n       * @type RegExp\n       */\n      'evaluate': /<%([\\s\\S]+?)%>/g,\n\n      /**\n       * Used to detect `data` property values to inject.\n       *\n       * @memberOf _.templateSettings\n       * @type RegExp\n       */\n      'interpolate': reInterpolate,\n\n      /**\n       * Used to reference the data object in the template text.\n       *\n       * @memberOf _.templateSettings\n       * @type String\n       */\n      'variable': '',\n\n      /**\n       * Used to import variables into the compiled template.\n       *\n       * @memberOf _.templateSettings\n       * @type Object\n       */\n      'imports': {\n\n        /**\n         * A reference to the `lodash` function.\n         *\n         * @memberOf _.templateSettings.imports\n         * @type Function\n         */\n        '_': lodash\n      }\n    };\n\n    /*--------------------------------------------------------------------------*/\n\n    /**\n     * Creates a function that, when called, invokes `func` with the `this` binding\n     * of `thisArg` and prepends any `partialArgs` to the arguments passed to the\n     * bound function.\n     *\n     * @private\n     * @param {Function|String} func The function to bind or the method name.\n     * @param {Mixed} [thisArg] The `this` binding of `func`.\n     * @param {Array} partialArgs An array of arguments to be partially applied.\n     * @param {Object} [idicator] Used to indicate binding by key or partially\n     *  applying arguments from the right.\n     * @returns {Function} Returns the new bound function.\n     */\n    function createBound(func, thisArg, partialArgs, indicator) {\n      var isFunc = isFunction(func),\n          isPartial = !partialArgs,\n          key = thisArg;\n\n      // juggle arguments\n      if (isPartial) {\n        var rightIndicator = indicator;\n        partialArgs = thisArg;\n      }\n      else if (!isFunc) {\n        if (!indicator) {\n          throw new TypeError;\n        }\n        thisArg = func;\n      }\n\n      function bound() {\n        // `Function#bind` spec\n        // http://es5.github.com/#x15.3.4.5\n        var args = arguments,\n            thisBinding = isPartial ? this : thisArg;\n\n        if (!isFunc) {\n          func = thisArg[key];\n        }\n        if (partialArgs.length) {\n          args = args.length\n            ? (args = nativeSlice.call(args), rightIndicator ? args.concat(partialArgs) : partialArgs.concat(args))\n            : partialArgs;\n        }\n        if (this instanceof bound) {\n          // ensure `new bound` is an instance of `func`\n          thisBinding = createObject(func.prototype);\n\n          // mimic the constructor's `return` behavior\n          // http://es5.github.com/#x13.2.2\n          var result = func.apply(thisBinding, args);\n          return isObject(result) ? result : thisBinding;\n        }\n        return func.apply(thisBinding, args);\n      }\n      return bound;\n    }\n\n    /**\n     * Creates a new object with the specified `prototype`.\n     *\n     * @private\n     * @param {Object} prototype The prototype object.\n     * @returns {Object} Returns the new object.\n     */\n    function createObject(prototype) {\n      return isObject(prototype) ? nativeCreate(prototype) : {};\n    }\n\n    /**\n     * Used by `escape` to convert characters to HTML entities.\n     *\n     * @private\n     * @param {String} match The matched character to escape.\n     * @returns {String} Returns the escaped character.\n     */\n    function escapeHtmlChar(match) {\n      return htmlEscapes[match];\n    }\n\n    /**\n     * Gets the appropriate \"indexOf\" function. If the `_.indexOf` method is\n     * customized, this method returns the custom method, otherwise it returns\n     * the `basicIndexOf` function.\n     *\n     * @private\n     * @returns {Function} Returns the \"indexOf\" function.\n     */\n    function getIndexOf(array, value, fromIndex) {\n      var result = (result = lodash.indexOf) === indexOf ? basicIndexOf : result;\n      return result;\n    }\n\n    /**\n     * Creates a function that juggles arguments, allowing argument overloading\n     * for `_.flatten` and `_.uniq`, before passing them to the given `func`.\n     *\n     * @private\n     * @param {Function} func The function to wrap.\n     * @returns {Function} Returns the new function.\n     */\n    function overloadWrapper(func) {\n      return function(array, flag, callback, thisArg) {\n        // juggle arguments\n        if (typeof flag != 'boolean' && flag != null) {\n          thisArg = callback;\n          callback = !(thisArg && thisArg[flag] === array) ? flag : undefined;\n          flag = false;\n        }\n        if (callback != null) {\n          callback = lodash.createCallback(callback, thisArg);\n        }\n        return func(array, flag, callback, thisArg);\n      };\n    }\n\n    /**\n     * A fallback implementation of `isPlainObject` which checks if a given `value`\n     * is an object created by the `Object` constructor, assuming objects created\n     * by the `Object` constructor have no inherited enumerable properties and that\n     * there are no `Object.prototype` extensions.\n     *\n     * @private\n     * @param {Mixed} value The value to check.\n     * @returns {Boolean} Returns `true`, if `value` is a plain object, else `false`.\n     */\n    function shimIsPlainObject(value) {\n      var ctor,\n          result;\n\n      // avoid non Object objects, `arguments` objects, and DOM elements\n      if (!(value && toString.call(value) == objectClass) ||\n          (ctor = value.constructor, isFunction(ctor) && !(ctor instanceof ctor))) {\n        return false;\n      }\n      // In most environments an object's own properties are iterated before\n      // its inherited properties. If the last iterated property is an object's\n      // own property then there are no inherited enumerable properties.\n      forIn(value, function(value, key) {\n        result = key;\n      });\n      return result === undefined || hasOwnProperty.call(value, result);\n    }\n\n    /**\n     * Used by `unescape` to convert HTML entities to characters.\n     *\n     * @private\n     * @param {String} match The matched character to unescape.\n     * @returns {String} Returns the unescaped character.\n     */\n    function unescapeHtmlChar(match) {\n      return htmlUnescapes[match];\n    }\n\n    /*--------------------------------------------------------------------------*/\n\n    /**\n     * Checks if `value` is an `arguments` object.\n     *\n     * @static\n     * @memberOf _\n     * @category Objects\n     * @param {Mixed} value The value to check.\n     * @returns {Boolean} Returns `true`, if the `value` is an `arguments` object, else `false`.\n     * @example\n     *\n     * (function() { return _.isArguments(arguments); })(1, 2, 3);\n     * // => true\n     *\n     * _.isArguments([1, 2, 3]);\n     * // => false\n     */\n    function isArguments(value) {\n      return toString.call(value) == argsClass;\n    }\n\n    /**\n     * Checks if `value` is an array.\n     *\n     * @static\n     * @memberOf _\n     * @category Objects\n     * @param {Mixed} value The value to check.\n     * @returns {Boolean} Returns `true`, if the `value` is an array, else `false`.\n     * @example\n     *\n     * (function() { return _.isArray(arguments); })();\n     * // => false\n     *\n     * _.isArray([1, 2, 3]);\n     * // => true\n     */\n    var isArray = nativeIsArray;\n\n    /**\n     * A fallback implementation of `Object.keys` which produces an array of the\n     * given object's own enumerable property names.\n     *\n     * @private\n     * @type Function\n     * @param {Object} object The object to inspect.\n     * @returns {Array} Returns a new array of property names.\n     */\n    var shimKeys = function (object) {\n      var index, iterable = object, result = [];\n      if (!iterable) return result;\n      if (!(objectTypes[typeof object])) return result;    \n        for (index in iterable) {\n          if (hasOwnProperty.call(iterable, index)) {\n            result.push(index);    \n          }\n        }    \n      return result\n    };\n\n    /**\n     * Creates an array composed of the own enumerable property names of `object`.\n     *\n     * @static\n     * @memberOf _\n     * @category Objects\n     * @param {Object} object The object to inspect.\n     * @returns {Array} Returns a new array of property names.\n     * @example\n     *\n     * _.keys({ 'one': 1, 'two': 2, 'three': 3 });\n     * // => ['one', 'two', 'three'] (order is not guaranteed)\n     */\n    var keys = !nativeKeys ? shimKeys : function(object) {\n      if (!isObject(object)) {\n        return [];\n      }\n      return nativeKeys(object);\n    };\n\n    /**\n     * Used to convert characters to HTML entities:\n     *\n     * Though the `>` character is escaped for symmetry, characters like `>` and `/`\n     * don't require escaping in HTML and have no special meaning unless they're part\n     * of a tag or an unquoted attribute value.\n     * http://mathiasbynens.be/notes/ambiguous-ampersands (under \"semi-related fun fact\")\n     */\n    var htmlEscapes = {\n      '&': '&amp;',\n      '<': '&lt;',\n      '>': '&gt;',\n      '\"': '&quot;',\n      \"'\": '&#39;'\n    };\n\n    /** Used to convert HTML entities to characters */\n    var htmlUnescapes = invert(htmlEscapes);\n\n    /*--------------------------------------------------------------------------*/\n\n    /**\n     * Assigns own enumerable properties of source object(s) to the destination\n     * object. Subsequent sources will overwrite property assignments of previous\n     * sources. If a `callback` function is passed, it will be executed to produce\n     * the assigned values. The `callback` is bound to `thisArg` and invoked with\n     * two arguments; (objectValue, sourceValue).\n     *\n     * @static\n     * @memberOf _\n     * @type Function\n     * @alias extend\n     * @category Objects\n     * @param {Object} object The destination object.\n     * @param {Object} [source1, source2, ...] The source objects.\n     * @param {Function} [callback] The function to customize assigning values.\n     * @param {Mixed} [thisArg] The `this` binding of `callback`.\n     * @returns {Object} Returns the destination object.\n     * @example\n     *\n     * _.assign({ 'name': 'moe' }, { 'age': 40 });\n     * // => { 'name': 'moe', 'age': 40 }\n     *\n     * var defaults = _.partialRight(_.assign, function(a, b) {\n     *   return typeof a == 'undefined' ? b : a;\n     * });\n     *\n     * var food = { 'name': 'apple' };\n     * defaults(food, { 'name': 'banana', 'type': 'fruit' });\n     * // => { 'name': 'apple', 'type': 'fruit' }\n     */\n    var assign = function (object, source, guard) {\n      var index, iterable = object, result = iterable;\n      if (!iterable) return result;\n      var args = arguments,\n          argsIndex = 0,\n          argsLength = typeof guard == 'number' ? 2 : args.length;\n      if (argsLength > 3 && typeof args[argsLength - 2] == 'function') {\n        var callback = lodash.createCallback(args[--argsLength - 1], args[argsLength--], 2);\n      } else if (argsLength > 2 && typeof args[argsLength - 1] == 'function') {\n        callback = args[--argsLength];\n      }\n      while (++argsIndex < argsLength) {\n        iterable = args[argsIndex];\n        if (iterable && objectTypes[typeof iterable]) {    \n        var ownIndex = -1,\n            ownProps = objectTypes[typeof iterable] && keys(iterable),\n            length = ownProps ? ownProps.length : 0;\n\n        while (++ownIndex < length) {\n          index = ownProps[ownIndex];\n          result[index] = callback ? callback(result[index], iterable[index]) : iterable[index];    \n        }    \n        }\n      }\n      return result\n    };\n\n    /**\n     * Creates a clone of `value`. If `deep` is `true`, nested objects will also\n     * be cloned, otherwise they will be assigned by reference. If a `callback`\n     * function is passed, it will be executed to produce the cloned values. If\n     * `callback` returns `undefined`, cloning will be handled by the method instead.\n     * The `callback` is bound to `thisArg` and invoked with one argument; (value).\n     *\n     * @static\n     * @memberOf _\n     * @category Objects\n     * @param {Mixed} value The value to clone.\n     * @param {Boolean} [deep=false] A flag to indicate a deep clone.\n     * @param {Function} [callback] The function to customize cloning values.\n     * @param {Mixed} [thisArg] The `this` binding of `callback`.\n     * @param- {Array} [stackA=[]] Tracks traversed source objects.\n     * @param- {Array} [stackB=[]] Associates clones with source counterparts.\n     * @returns {Mixed} Returns the cloned `value`.\n     * @example\n     *\n     * var stooges = [\n     *   { 'name': 'moe', 'age': 40 },\n     *   { 'name': 'larry', 'age': 50 }\n     * ];\n     *\n     * var shallow = _.clone(stooges);\n     * shallow[0] === stooges[0];\n     * // => true\n     *\n     * var deep = _.clone(stooges, true);\n     * deep[0] === stooges[0];\n     * // => false\n     *\n     * _.mixin({\n     *   'clone': _.partialRight(_.clone, function(value) {\n     *     return _.isElement(value) ? value.cloneNode(false) : undefined;\n     *   })\n     * });\n     *\n     * var clone = _.clone(document.body);\n     * clone.childNodes.length;\n     * // => 0\n     */\n    function clone(value, deep, callback, thisArg, stackA, stackB) {\n      var result = value;\n\n      // allows working with \"Collections\" methods without using their `callback`\n      // argument, `index|key`, for this method's `callback`\n      if (typeof deep != 'boolean' && deep != null) {\n        thisArg = callback;\n        callback = deep;\n        deep = false;\n      }\n      if (typeof callback == 'function') {\n        callback = (typeof thisArg == 'undefined')\n          ? callback\n          : lodash.createCallback(callback, thisArg, 1);\n\n        result = callback(result);\n        if (typeof result != 'undefined') {\n          return result;\n        }\n        result = value;\n      }\n      // inspect [[Class]]\n      var isObj = isObject(result);\n      if (isObj) {\n        var className = toString.call(result);\n        if (!cloneableClasses[className]) {\n          return result;\n        }\n        var isArr = isArray(result);\n      }\n      // shallow clone\n      if (!isObj || !deep) {\n        return isObj\n          ? (isArr ? slice(result) : assign({}, result))\n          : result;\n      }\n      var ctor = ctorByClass[className];\n      switch (className) {\n        case boolClass:\n        case dateClass:\n          return new ctor(+result);\n\n        case numberClass:\n        case stringClass:\n          return new ctor(result);\n\n        case regexpClass:\n          return ctor(result.source, reFlags.exec(result));\n      }\n      // check for circular references and return corresponding clone\n      var initedStack = !stackA;\n      stackA || (stackA = getArray());\n      stackB || (stackB = getArray());\n\n      var length = stackA.length;\n      while (length--) {\n        if (stackA[length] == value) {\n          return stackB[length];\n        }\n      }\n      // init cloned object\n      result = isArr ? ctor(result.length) : {};\n\n      // add array properties assigned by `RegExp#exec`\n      if (isArr) {\n        if (hasOwnProperty.call(value, 'index')) {\n          result.index = value.index;\n        }\n        if (hasOwnProperty.call(value, 'input')) {\n          result.input = value.input;\n        }\n      }\n      // add the source value to the stack of traversed objects\n      // and associate it with its clone\n      stackA.push(value);\n      stackB.push(result);\n\n      // recursively populate clone (susceptible to call stack limits)\n      (isArr ? forEach : forOwn)(value, function(objValue, key) {\n        result[key] = clone(objValue, deep, callback, undefined, stackA, stackB);\n      });\n\n      if (initedStack) {\n        releaseArray(stackA);\n        releaseArray(stackB);\n      }\n      return result;\n    }\n\n    /**\n     * Creates a deep clone of `value`. If a `callback` function is passed,\n     * it will be executed to produce the cloned values. If `callback` returns\n     * `undefined`, cloning will be handled by the method instead. The `callback`\n     * is bound to `thisArg` and invoked with one argument; (value).\n     *\n     * Note: This method is loosely based on the structured clone algorithm. Functions\n     * and DOM nodes are **not** cloned. The enumerable properties of `arguments` objects and\n     * objects created by constructors other than `Object` are cloned to plain `Object` objects.\n     * See http://www.w3.org/TR/html5/infrastructure.html#internal-structured-cloning-algorithm.\n     *\n     * @static\n     * @memberOf _\n     * @category Objects\n     * @param {Mixed} value The value to deep clone.\n     * @param {Function} [callback] The function to customize cloning values.\n     * @param {Mixed} [thisArg] The `this` binding of `callback`.\n     * @returns {Mixed} Returns the deep cloned `value`.\n     * @example\n     *\n     * var stooges = [\n     *   { 'name': 'moe', 'age': 40 },\n     *   { 'name': 'larry', 'age': 50 }\n     * ];\n     *\n     * var deep = _.cloneDeep(stooges);\n     * deep[0] === stooges[0];\n     * // => false\n     *\n     * var view = {\n     *   'label': 'docs',\n     *   'node': element\n     * };\n     *\n     * var clone = _.cloneDeep(view, function(value) {\n     *   return _.isElement(value) ? value.cloneNode(true) : undefined;\n     * });\n     *\n     * clone.node == view.node;\n     * // => false\n     */\n    function cloneDeep(value, callback, thisArg) {\n      return clone(value, true, callback, thisArg);\n    }\n\n    /**\n     * Assigns own enumerable properties of source object(s) to the destination\n     * object for all destination properties that resolve to `undefined`. Once a\n     * property is set, additional defaults of the same property will be ignored.\n     *\n     * @static\n     * @memberOf _\n     * @type Function\n     * @category Objects\n     * @param {Object} object The destination object.\n     * @param {Object} [source1, source2, ...] The source objects.\n     * @param- {Object} [guard] Allows working with `_.reduce` without using its\n     *  callback's `key` and `object` arguments as sources.\n     * @returns {Object} Returns the destination object.\n     * @example\n     *\n     * var food = { 'name': 'apple' };\n     * _.defaults(food, { 'name': 'banana', 'type': 'fruit' });\n     * // => { 'name': 'apple', 'type': 'fruit' }\n     */\n    var defaults = function (object, source, guard) {\n      var index, iterable = object, result = iterable;\n      if (!iterable) return result;\n      var args = arguments,\n          argsIndex = 0,\n          argsLength = typeof guard == 'number' ? 2 : args.length;\n      while (++argsIndex < argsLength) {\n        iterable = args[argsIndex];\n        if (iterable && objectTypes[typeof iterable]) {    \n        var ownIndex = -1,\n            ownProps = objectTypes[typeof iterable] && keys(iterable),\n            length = ownProps ? ownProps.length : 0;\n\n        while (++ownIndex < length) {\n          index = ownProps[ownIndex];\n          if (typeof result[index] == 'undefined') result[index] = iterable[index];    \n        }    \n        }\n      }\n      return result\n    };\n\n    /**\n     * This method is similar to `_.find`, except that it returns the key of the\n     * element that passes the callback check, instead of the element itself.\n     *\n     * @static\n     * @memberOf _\n     * @category Objects\n     * @param {Object} object The object to search.\n     * @param {Function|Object|String} [callback=identity] The function called per\n     *  iteration. If a property name or object is passed, it will be used to create\n     *  a \"_.pluck\" or \"_.where\" style callback, respectively.\n     * @param {Mixed} [thisArg] The `this` binding of `callback`.\n     * @returns {Mixed} Returns the key of the found element, else `undefined`.\n     * @example\n     *\n     * _.findKey({ 'a': 1, 'b': 2, 'c': 3, 'd': 4 }, function(num) {\n     *   return num % 2 == 0;\n     * });\n     * // => 'b'\n     */\n    function findKey(object, callback, thisArg) {\n      var result;\n      callback = lodash.createCallback(callback, thisArg);\n      forOwn(object, function(value, key, object) {\n        if (callback(value, key, object)) {\n          result = key;\n          return false;\n        }\n      });\n      return result;\n    }\n\n    /**\n     * Iterates over `object`'s own and inherited enumerable properties, executing\n     * the `callback` for each property. The `callback` is bound to `thisArg` and\n     * invoked with three arguments; (value, key, object). Callbacks may exit iteration\n     * early by explicitly returning `false`.\n     *\n     * @static\n     * @memberOf _\n     * @type Function\n     * @category Objects\n     * @param {Object} object The object to iterate over.\n     * @param {Function} [callback=identity] The function called per iteration.\n     * @param {Mixed} [thisArg] The `this` binding of `callback`.\n     * @returns {Object} Returns `object`.\n     * @example\n     *\n     * function Dog(name) {\n     *   this.name = name;\n     * }\n     *\n     * Dog.prototype.bark = function() {\n     *   alert('Woof, woof!');\n     * };\n     *\n     * _.forIn(new Dog('Dagny'), function(value, key) {\n     *   alert(key);\n     * });\n     * // => alerts 'name' and 'bark' (order is not guaranteed)\n     */\n    var forIn = function (collection, callback, thisArg) {\n      var index, iterable = collection, result = iterable;\n      if (!iterable) return result;\n      if (!objectTypes[typeof iterable]) return result;\n      callback = callback && typeof thisArg == 'undefined' ? callback : lodash.createCallback(callback, thisArg);    \n        for (index in iterable) {\n          if (callback(iterable[index], index, collection) === false) return result;    \n        }    \n      return result\n    };\n\n    /**\n     * Iterates over an object's own enumerable properties, executing the `callback`\n     * for each property. The `callback` is bound to `thisArg` and invoked with three\n     * arguments; (value, key, object). Callbacks may exit iteration early by explicitly\n     * returning `false`.\n     *\n     * @static\n     * @memberOf _\n     * @type Function\n     * @category Objects\n     * @param {Object} object The object to iterate over.\n     * @param {Function} [callback=identity] The function called per iteration.\n     * @param {Mixed} [thisArg] The `this` binding of `callback`.\n     * @returns {Object} Returns `object`.\n     * @example\n     *\n     * _.forOwn({ '0': 'zero', '1': 'one', 'length': 2 }, function(num, key) {\n     *   alert(key);\n     * });\n     * // => alerts '0', '1', and 'length' (order is not guaranteed)\n     */\n    var forOwn = function (collection, callback, thisArg) {\n      var index, iterable = collection, result = iterable;\n      if (!iterable) return result;\n      if (!objectTypes[typeof iterable]) return result;\n      callback = callback && typeof thisArg == 'undefined' ? callback : lodash.createCallback(callback, thisArg);    \n        var ownIndex = -1,\n            ownProps = objectTypes[typeof iterable] && keys(iterable),\n            length = ownProps ? ownProps.length : 0;\n\n        while (++ownIndex < length) {\n          index = ownProps[ownIndex];\n          if (callback(iterable[index], index, collection) === false) return result;    \n        }    \n      return result\n    };\n\n    /**\n     * Creates a sorted array of all enumerable properties, own and inherited,\n     * of `object` that have function values.\n     *\n     * @static\n     * @memberOf _\n     * @alias methods\n     * @category Objects\n     * @param {Object} object The object to inspect.\n     * @returns {Array} Returns a new array of property names that have function values.\n     * @example\n     *\n     * _.functions(_);\n     * // => ['all', 'any', 'bind', 'bindAll', 'clone', 'compact', 'compose', ...]\n     */\n    function functions(object) {\n      var result = [];\n      forIn(object, function(value, key) {\n        if (isFunction(value)) {\n          result.push(key);\n        }\n      });\n      return result.sort();\n    }\n\n    /**\n     * Checks if the specified object `property` exists and is a direct property,\n     * instead of an inherited property.\n     *\n     * @static\n     * @memberOf _\n     * @category Objects\n     * @param {Object} object The object to check.\n     * @param {String} property The property to check for.\n     * @returns {Boolean} Returns `true` if key is a direct property, else `false`.\n     * @example\n     *\n     * _.has({ 'a': 1, 'b': 2, 'c': 3 }, 'b');\n     * // => true\n     */\n    function has(object, property) {\n      return object ? hasOwnProperty.call(object, property) : false;\n    }\n\n    /**\n     * Creates an object composed of the inverted keys and values of the given `object`.\n     *\n     * @static\n     * @memberOf _\n     * @category Objects\n     * @param {Object} object The object to invert.\n     * @returns {Object} Returns the created inverted object.\n     * @example\n     *\n     *  _.invert({ 'first': 'moe', 'second': 'larry' });\n     * // => { 'moe': 'first', 'larry': 'second' }\n     */\n    function invert(object) {\n      var index = -1,\n          props = keys(object),\n          length = props.length,\n          result = {};\n\n      while (++index < length) {\n        var key = props[index];\n        result[object[key]] = key;\n      }\n      return result;\n    }\n\n    /**\n     * Checks if `value` is a boolean value.\n     *\n     * @static\n     * @memberOf _\n     * @category Objects\n     * @param {Mixed} value The value to check.\n     * @returns {Boolean} Returns `true`, if the `value` is a boolean value, else `false`.\n     * @example\n     *\n     * _.isBoolean(null);\n     * // => false\n     */\n    function isBoolean(value) {\n      return value === true || value === false || toString.call(value) == boolClass;\n    }\n\n    /**\n     * Checks if `value` is a date.\n     *\n     * @static\n     * @memberOf _\n     * @category Objects\n     * @param {Mixed} value The value to check.\n     * @returns {Boolean} Returns `true`, if the `value` is a date, else `false`.\n     * @example\n     *\n     * _.isDate(new Date);\n     * // => true\n     */\n    function isDate(value) {\n      return value ? (typeof value == 'object' && toString.call(value) == dateClass) : false;\n    }\n\n    /**\n     * Checks if `value` is a DOM element.\n     *\n     * @static\n     * @memberOf _\n     * @category Objects\n     * @param {Mixed} value The value to check.\n     * @returns {Boolean} Returns `true`, if the `value` is a DOM element, else `false`.\n     * @example\n     *\n     * _.isElement(document.body);\n     * // => true\n     */\n    function isElement(value) {\n      return value ? value.nodeType === 1 : false;\n    }\n\n    /**\n     * Checks if `value` is empty. Arrays, strings, or `arguments` objects with a\n     * length of `0` and objects with no own enumerable properties are considered\n     * \"empty\".\n     *\n     * @static\n     * @memberOf _\n     * @category Objects\n     * @param {Array|Object|String} value The value to inspect.\n     * @returns {Boolean} Returns `true`, if the `value` is empty, else `false`.\n     * @example\n     *\n     * _.isEmpty([1, 2, 3]);\n     * // => false\n     *\n     * _.isEmpty({});\n     * // => true\n     *\n     * _.isEmpty('');\n     * // => true\n     */\n    function isEmpty(value) {\n      var result = true;\n      if (!value) {\n        return result;\n      }\n      var className = toString.call(value),\n          length = value.length;\n\n      if ((className == arrayClass || className == stringClass || className == argsClass ) ||\n          (className == objectClass && typeof length == 'number' && isFunction(value.splice))) {\n        return !length;\n      }\n      forOwn(value, function() {\n        return (result = false);\n      });\n      return result;\n    }\n\n    /**\n     * Performs a deep comparison between two values to determine if they are\n     * equivalent to each other. If `callback` is passed, it will be executed to\n     * compare values. If `callback` returns `undefined`, comparisons will be handled\n     * by the method instead. The `callback` is bound to `thisArg` and invoked with\n     * two arguments; (a, b).\n     *\n     * @static\n     * @memberOf _\n     * @category Objects\n     * @param {Mixed} a The value to compare.\n     * @param {Mixed} b The other value to compare.\n     * @param {Function} [callback] The function to customize comparing values.\n     * @param {Mixed} [thisArg] The `this` binding of `callback`.\n     * @param- {Array} [stackA=[]] Tracks traversed `a` objects.\n     * @param- {Array} [stackB=[]] Tracks traversed `b` objects.\n     * @returns {Boolean} Returns `true`, if the values are equivalent, else `false`.\n     * @example\n     *\n     * var moe = { 'name': 'moe', 'age': 40 };\n     * var copy = { 'name': 'moe', 'age': 40 };\n     *\n     * moe == copy;\n     * // => false\n     *\n     * _.isEqual(moe, copy);\n     * // => true\n     *\n     * var words = ['hello', 'goodbye'];\n     * var otherWords = ['hi', 'goodbye'];\n     *\n     * _.isEqual(words, otherWords, function(a, b) {\n     *   var reGreet = /^(?:hello|hi)$/i,\n     *       aGreet = _.isString(a) && reGreet.test(a),\n     *       bGreet = _.isString(b) && reGreet.test(b);\n     *\n     *   return (aGreet || bGreet) ? (aGreet == bGreet) : undefined;\n     * });\n     * // => true\n     */\n    function isEqual(a, b, callback, thisArg, stackA, stackB) {\n      // used to indicate that when comparing objects, `a` has at least the properties of `b`\n      var whereIndicator = callback === indicatorObject;\n      if (typeof callback == 'function' && !whereIndicator) {\n        callback = lodash.createCallback(callback, thisArg, 2);\n        var result = callback(a, b);\n        if (typeof result != 'undefined') {\n          return !!result;\n        }\n      }\n      // exit early for identical values\n      if (a === b) {\n        // treat `+0` vs. `-0` as not equal\n        return a !== 0 || (1 / a == 1 / b);\n      }\n      var type = typeof a,\n          otherType = typeof b;\n\n      // exit early for unlike primitive values\n      if (a === a &&\n          (!a || (type != 'function' && type != 'object')) &&\n          (!b || (otherType != 'function' && otherType != 'object'))) {\n        return false;\n      }\n      // exit early for `null` and `undefined`, avoiding ES3's Function#call behavior\n      // http://es5.github.com/#x15.3.4.4\n      if (a == null || b == null) {\n        return a === b;\n      }\n      // compare [[Class]] names\n      var className = toString.call(a),\n          otherClass = toString.call(b);\n\n      if (className == argsClass) {\n        className = objectClass;\n      }\n      if (otherClass == argsClass) {\n        otherClass = objectClass;\n      }\n      if (className != otherClass) {\n        return false;\n      }\n      switch (className) {\n        case boolClass:\n        case dateClass:\n          // coerce dates and booleans to numbers, dates to milliseconds and booleans\n          // to `1` or `0`, treating invalid dates coerced to `NaN` as not equal\n          return +a == +b;\n\n        case numberClass:\n          // treat `NaN` vs. `NaN` as equal\n          return (a != +a)\n            ? b != +b\n            // but treat `+0` vs. `-0` as not equal\n            : (a == 0 ? (1 / a == 1 / b) : a == +b);\n\n        case regexpClass:\n        case stringClass:\n          // coerce regexes to strings (http://es5.github.com/#x15.10.6.4)\n          // treat string primitives and their corresponding object instances as equal\n          return a == String(b);\n      }\n      var isArr = className == arrayClass;\n      if (!isArr) {\n        // unwrap any `lodash` wrapped values\n        if (hasOwnProperty.call(a, '__wrapped__ ') || hasOwnProperty.call(b, '__wrapped__')) {\n          return isEqual(a.__wrapped__ || a, b.__wrapped__ || b, callback, thisArg, stackA, stackB);\n        }\n        // exit for functions and DOM nodes\n        if (className != objectClass) {\n          return false;\n        }\n        // in older versions of Opera, `arguments` objects have `Array` constructors\n        var ctorA = a.constructor,\n            ctorB = b.constructor;\n\n        // non `Object` object instances with different constructors are not equal\n        if (ctorA != ctorB && !(\n              isFunction(ctorA) && ctorA instanceof ctorA &&\n              isFunction(ctorB) && ctorB instanceof ctorB\n            )) {\n          return false;\n        }\n      }\n      // assume cyclic structures are equal\n      // the algorithm for detecting cyclic structures is adapted from ES 5.1\n      // section 15.12.3, abstract operation `JO` (http://es5.github.com/#x15.12.3)\n      var initedStack = !stackA;\n      stackA || (stackA = getArray());\n      stackB || (stackB = getArray());\n\n      var length = stackA.length;\n      while (length--) {\n        if (stackA[length] == a) {\n          return stackB[length] == b;\n        }\n      }\n      var size = 0;\n      result = true;\n\n      // add `a` and `b` to the stack of traversed objects\n      stackA.push(a);\n      stackB.push(b);\n\n      // recursively compare objects and arrays (susceptible to call stack limits)\n      if (isArr) {\n        length = a.length;\n        size = b.length;\n\n        // compare lengths to determine if a deep comparison is necessary\n        result = size == a.length;\n        if (!result && !whereIndicator) {\n          return result;\n        }\n        // deep compare the contents, ignoring non-numeric properties\n        while (size--) {\n          var index = length,\n              value = b[size];\n\n          if (whereIndicator) {\n            while (index--) {\n              if ((result = isEqual(a[index], value, callback, thisArg, stackA, stackB))) {\n                break;\n              }\n            }\n          } else if (!(result = isEqual(a[size], value, callback, thisArg, stackA, stackB))) {\n            break;\n          }\n        }\n        return result;\n      }\n      // deep compare objects using `forIn`, instead of `forOwn`, to avoid `Object.keys`\n      // which, in this case, is more costly\n      forIn(b, function(value, key, b) {\n        if (hasOwnProperty.call(b, key)) {\n          // count the number of properties.\n          size++;\n          // deep compare each property value.\n          return (result = hasOwnProperty.call(a, key) && isEqual(a[key], value, callback, thisArg, stackA, stackB));\n        }\n      });\n\n      if (result && !whereIndicator) {\n        // ensure both objects have the same number of properties\n        forIn(a, function(value, key, a) {\n          if (hasOwnProperty.call(a, key)) {\n            // `size` will be `-1` if `a` has more properties than `b`\n            return (result = --size > -1);\n          }\n        });\n      }\n      if (initedStack) {\n        releaseArray(stackA);\n        releaseArray(stackB);\n      }\n      return result;\n    }\n\n    /**\n     * Checks if `value` is, or can be coerced to, a finite number.\n     *\n     * Note: This is not the same as native `isFinite`, which will return true for\n     * booleans and empty strings. See http://es5.github.com/#x15.1.2.5.\n     *\n     * @static\n     * @memberOf _\n     * @category Objects\n     * @param {Mixed} value The value to check.\n     * @returns {Boolean} Returns `true`, if the `value` is finite, else `false`.\n     * @example\n     *\n     * _.isFinite(-101);\n     * // => true\n     *\n     * _.isFinite('10');\n     * // => true\n     *\n     * _.isFinite(true);\n     * // => false\n     *\n     * _.isFinite('');\n     * // => false\n     *\n     * _.isFinite(Infinity);\n     * // => false\n     */\n    function isFinite(value) {\n      return nativeIsFinite(value) && !nativeIsNaN(parseFloat(value));\n    }\n\n    /**\n     * Checks if `value` is a function.\n     *\n     * @static\n     * @memberOf _\n     * @category Objects\n     * @param {Mixed} value The value to check.\n     * @returns {Boolean} Returns `true`, if the `value` is a function, else `false`.\n     * @example\n     *\n     * _.isFunction(_);\n     * // => true\n     */\n    function isFunction(value) {\n      return typeof value == 'function';\n    }\n\n    /**\n     * Checks if `value` is the language type of Object.\n     * (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)\n     *\n     * @static\n     * @memberOf _\n     * @category Objects\n     * @param {Mixed} value The value to check.\n     * @returns {Boolean} Returns `true`, if the `value` is an object, else `false`.\n     * @example\n     *\n     * _.isObject({});\n     * // => true\n     *\n     * _.isObject([1, 2, 3]);\n     * // => true\n     *\n     * _.isObject(1);\n     * // => false\n     */\n    function isObject(value) {\n      // check if the value is the ECMAScript language type of Object\n      // http://es5.github.com/#x8\n      // and avoid a V8 bug\n      // http://code.google.com/p/v8/issues/detail?id=2291\n      return !!(value && objectTypes[typeof value]);\n    }\n\n    /**\n     * Checks if `value` is `NaN`.\n     *\n     * Note: This is not the same as native `isNaN`, which will return `true` for\n     * `undefined` and other values. See http://es5.github.com/#x15.1.2.4.\n     *\n     * @static\n     * @memberOf _\n     * @category Objects\n     * @param {Mixed} value The value to check.\n     * @returns {Boolean} Returns `true`, if the `value` is `NaN`, else `false`.\n     * @example\n     *\n     * _.isNaN(NaN);\n     * // => true\n     *\n     * _.isNaN(new Number(NaN));\n     * // => true\n     *\n     * isNaN(undefined);\n     * // => true\n     *\n     * _.isNaN(undefined);\n     * // => false\n     */\n    function isNaN(value) {\n      // `NaN` as a primitive is the only value that is not equal to itself\n      // (perform the [[Class]] check first to avoid errors with some host objects in IE)\n      return isNumber(value) && value != +value\n    }\n\n    /**\n     * Checks if `value` is `null`.\n     *\n     * @static\n     * @memberOf _\n     * @category Objects\n     * @param {Mixed} value The value to check.\n     * @returns {Boolean} Returns `true`, if the `value` is `null`, else `false`.\n     * @example\n     *\n     * _.isNull(null);\n     * // => true\n     *\n     * _.isNull(undefined);\n     * // => false\n     */\n    function isNull(value) {\n      return value === null;\n    }\n\n    /**\n     * Checks if `value` is a number.\n     *\n     * @static\n     * @memberOf _\n     * @category Objects\n     * @param {Mixed} value The value to check.\n     * @returns {Boolean} Returns `true`, if the `value` is a number, else `false`.\n     * @example\n     *\n     * _.isNumber(8.4 * 5);\n     * // => true\n     */\n    function isNumber(value) {\n      return typeof value == 'number' || toString.call(value) == numberClass;\n    }\n\n    /**\n     * Checks if a given `value` is an object created by the `Object` constructor.\n     *\n     * @static\n     * @memberOf _\n     * @category Objects\n     * @param {Mixed} value The value to check.\n     * @returns {Boolean} Returns `true`, if `value` is a plain object, else `false`.\n     * @example\n     *\n     * function Stooge(name, age) {\n     *   this.name = name;\n     *   this.age = age;\n     * }\n     *\n     * _.isPlainObject(new Stooge('moe', 40));\n     * // => false\n     *\n     * _.isPlainObject([1, 2, 3]);\n     * // => false\n     *\n     * _.isPlainObject({ 'name': 'moe', 'age': 40 });\n     * // => true\n     */\n    var isPlainObject = function(value) {\n      if (!(value && toString.call(value) == objectClass)) {\n        return false;\n      }\n      var valueOf = value.valueOf,\n          objProto = typeof valueOf == 'function' && (objProto = getPrototypeOf(valueOf)) && getPrototypeOf(objProto);\n\n      return objProto\n        ? (value == objProto || getPrototypeOf(value) == objProto)\n        : shimIsPlainObject(value);\n    };\n\n    /**\n     * Checks if `value` is a regular expression.\n     *\n     * @static\n     * @memberOf _\n     * @category Objects\n     * @param {Mixed} value The value to check.\n     * @returns {Boolean} Returns `true`, if the `value` is a regular expression, else `false`.\n     * @example\n     *\n     * _.isRegExp(/moe/);\n     * // => true\n     */\n    function isRegExp(value) {\n      return value ? (typeof value == 'object' && toString.call(value) == regexpClass) : false;\n    }\n\n    /**\n     * Checks if `value` is a string.\n     *\n     * @static\n     * @memberOf _\n     * @category Objects\n     * @param {Mixed} value The value to check.\n     * @returns {Boolean} Returns `true`, if the `value` is a string, else `false`.\n     * @example\n     *\n     * _.isString('moe');\n     * // => true\n     */\n    function isString(value) {\n      return typeof value == 'string' || toString.call(value) == stringClass;\n    }\n\n    /**\n     * Checks if `value` is `undefined`.\n     *\n     * @static\n     * @memberOf _\n     * @category Objects\n     * @param {Mixed} value The value to check.\n     * @returns {Boolean} Returns `true`, if the `value` is `undefined`, else `false`.\n     * @example\n     *\n     * _.isUndefined(void 0);\n     * // => true\n     */\n    function isUndefined(value) {\n      return typeof value == 'undefined';\n    }\n\n    /**\n     * Recursively merges own enumerable properties of the source object(s), that\n     * don't resolve to `undefined`, into the destination object. Subsequent sources\n     * will overwrite property assignments of previous sources. If a `callback` function\n     * is passed, it will be executed to produce the merged values of the destination\n     * and source properties. If `callback` returns `undefined`, merging will be\n     * handled by the method instead. The `callback` is bound to `thisArg` and\n     * invoked with two arguments; (objectValue, sourceValue).\n     *\n     * @static\n     * @memberOf _\n     * @category Objects\n     * @param {Object} object The destination object.\n     * @param {Object} [source1, source2, ...] The source objects.\n     * @param {Function} [callback] The function to customize merging properties.\n     * @param {Mixed} [thisArg] The `this` binding of `callback`.\n     * @param- {Object} [deepIndicator] Indicates that `stackA` and `stackB` are\n     *  arrays of traversed objects, instead of source objects.\n     * @param- {Array} [stackA=[]] Tracks traversed source objects.\n     * @param- {Array} [stackB=[]] Associates values with source counterparts.\n     * @returns {Object} Returns the destination object.\n     * @example\n     *\n     * var names = {\n     *   'stooges': [\n     *     { 'name': 'moe' },\n     *     { 'name': 'larry' }\n     *   ]\n     * };\n     *\n     * var ages = {\n     *   'stooges': [\n     *     { 'age': 40 },\n     *     { 'age': 50 }\n     *   ]\n     * };\n     *\n     * _.merge(names, ages);\n     * // => { 'stooges': [{ 'name': 'moe', 'age': 40 }, { 'name': 'larry', 'age': 50 }] }\n     *\n     * var food = {\n     *   'fruits': ['apple'],\n     *   'vegetables': ['beet']\n     * };\n     *\n     * var otherFood = {\n     *   'fruits': ['banana'],\n     *   'vegetables': ['carrot']\n     * };\n     *\n     * _.merge(food, otherFood, function(a, b) {\n     *   return _.isArray(a) ? a.concat(b) : undefined;\n     * });\n     * // => { 'fruits': ['apple', 'banana'], 'vegetables': ['beet', 'carrot] }\n     */\n    function merge(object, source, deepIndicator) {\n      var args = arguments,\n          index = 0,\n          length = 2;\n\n      if (!isObject(object)) {\n        return object;\n      }\n      if (deepIndicator === indicatorObject) {\n        var callback = args[3],\n            stackA = args[4],\n            stackB = args[5];\n      } else {\n        var initedStack = true;\n        stackA = getArray();\n        stackB = getArray();\n\n        // allows working with `_.reduce` and `_.reduceRight` without\n        // using their `callback` arguments, `index|key` and `collection`\n        if (typeof deepIndicator != 'number') {\n          length = args.length;\n        }\n        if (length > 3 && typeof args[length - 2] == 'function') {\n          callback = lodash.createCallback(args[--length - 1], args[length--], 2);\n        } else if (length > 2 && typeof args[length - 1] == 'function') {\n          callback = args[--length];\n        }\n      }\n      while (++index < length) {\n        (isArray(args[index]) ? forEach : forOwn)(args[index], function(source, key) {\n          var found,\n              isArr,\n              result = source,\n              value = object[key];\n\n          if (source && ((isArr = isArray(source)) || isPlainObject(source))) {\n            // avoid merging previously merged cyclic sources\n            var stackLength = stackA.length;\n            while (stackLength--) {\n              if ((found = stackA[stackLength] == source)) {\n                value = stackB[stackLength];\n                break;\n              }\n            }\n            if (!found) {\n              var isShallow;\n              if (callback) {\n                result = callback(value, source);\n                if ((isShallow = typeof result != 'undefined')) {\n                  value = result;\n                }\n              }\n              if (!isShallow) {\n                value = isArr\n                  ? (isArray(value) ? value : [])\n                  : (isPlainObject(value) ? value : {});\n              }\n              // add `source` and associated `value` to the stack of traversed objects\n              stackA.push(source);\n              stackB.push(value);\n\n              // recursively merge objects and arrays (susceptible to call stack limits)\n              if (!isShallow) {\n                value = merge(value, source, indicatorObject, callback, stackA, stackB);\n              }\n            }\n          }\n          else {\n            if (callback) {\n              result = callback(value, source);\n              if (typeof result == 'undefined') {\n                result = source;\n              }\n            }\n            if (typeof result != 'undefined') {\n              value = result;\n            }\n          }\n          object[key] = value;\n        });\n      }\n\n      if (initedStack) {\n        releaseArray(stackA);\n        releaseArray(stackB);\n      }\n      return object;\n    }\n\n    /**\n     * Creates a shallow clone of `object` excluding the specified properties.\n     * Property names may be specified as individual arguments or as arrays of\n     * property names. If a `callback` function is passed, it will be executed\n     * for each property in the `object`, omitting the properties `callback`\n     * returns truthy for. The `callback` is bound to `thisArg` and invoked\n     * with three arguments; (value, key, object).\n     *\n     * @static\n     * @memberOf _\n     * @category Objects\n     * @param {Object} object The source object.\n     * @param {Function|String} callback|[prop1, prop2, ...] The properties to omit\n     *  or the function called per iteration.\n     * @param {Mixed} [thisArg] The `this` binding of `callback`.\n     * @returns {Object} Returns an object without the omitted properties.\n     * @example\n     *\n     * _.omit({ 'name': 'moe', 'age': 40 }, 'age');\n     * // => { 'name': 'moe' }\n     *\n     * _.omit({ 'name': 'moe', 'age': 40 }, function(value) {\n     *   return typeof value == 'number';\n     * });\n     * // => { 'name': 'moe' }\n     */\n    function omit(object, callback, thisArg) {\n      var indexOf = getIndexOf(),\n          isFunc = typeof callback == 'function',\n          result = {};\n\n      if (isFunc) {\n        callback = lodash.createCallback(callback, thisArg);\n      } else {\n        var props = concat.apply(arrayRef, nativeSlice.call(arguments, 1));\n      }\n      forIn(object, function(value, key, object) {\n        if (isFunc\n              ? !callback(value, key, object)\n              : indexOf(props, key) < 0\n            ) {\n          result[key] = value;\n        }\n      });\n      return result;\n    }\n\n    /**\n     * Creates a two dimensional array of the given object's key-value pairs,\n     * i.e. `[[key1, value1], [key2, value2]]`.\n     *\n     * @static\n     * @memberOf _\n     * @category Objects\n     * @param {Object} object The object to inspect.\n     * @returns {Array} Returns new array of key-value pairs.\n     * @example\n     *\n     * _.pairs({ 'moe': 30, 'larry': 40 });\n     * // => [['moe', 30], ['larry', 40]] (order is not guaranteed)\n     */\n    function pairs(object) {\n      var index = -1,\n          props = keys(object),\n          length = props.length,\n          result = Array(length);\n\n      while (++index < length) {\n        var key = props[index];\n        result[index] = [key, object[key]];\n      }\n      return result;\n    }\n\n    /**\n     * Creates a shallow clone of `object` composed of the specified properties.\n     * Property names may be specified as individual arguments or as arrays of property\n     * names. If `callback` is passed, it will be executed for each property in the\n     * `object`, picking the properties `callback` returns truthy for. The `callback`\n     * is bound to `thisArg` and invoked with three arguments; (value, key, object).\n     *\n     * @static\n     * @memberOf _\n     * @category Objects\n     * @param {Object} object The source object.\n     * @param {Array|Function|String} callback|[prop1, prop2, ...] The function called\n     *  per iteration or properties to pick, either as individual arguments or arrays.\n     * @param {Mixed} [thisArg] The `this` binding of `callback`.\n     * @returns {Object} Returns an object composed of the picked properties.\n     * @example\n     *\n     * _.pick({ 'name': 'moe', '_userid': 'moe1' }, 'name');\n     * // => { 'name': 'moe' }\n     *\n     * _.pick({ 'name': 'moe', '_userid': 'moe1' }, function(value, key) {\n     *   return key.charAt(0) != '_';\n     * });\n     * // => { 'name': 'moe' }\n     */\n    function pick(object, callback, thisArg) {\n      var result = {};\n      if (typeof callback != 'function') {\n        var index = -1,\n            props = concat.apply(arrayRef, nativeSlice.call(arguments, 1)),\n            length = isObject(object) ? props.length : 0;\n\n        while (++index < length) {\n          var key = props[index];\n          if (key in object) {\n            result[key] = object[key];\n          }\n        }\n      } else {\n        callback = lodash.createCallback(callback, thisArg);\n        forIn(object, function(value, key, object) {\n          if (callback(value, key, object)) {\n            result[key] = value;\n          }\n        });\n      }\n      return result;\n    }\n\n    /**\n     * An alternative to `_.reduce`, this method transforms an `object` to a new\n     * `accumulator` object which is the result of running each of its elements\n     * through the `callback`, with each `callback` execution potentially mutating\n     * the `accumulator` object. The `callback` is bound to `thisArg` and invoked\n     * with four arguments; (accumulator, value, key, object). Callbacks may exit\n     * iteration early by explicitly returning `false`.\n     *\n     * @static\n     * @memberOf _\n     * @category Objects\n     * @param {Array|Object} collection The collection to iterate over.\n     * @param {Function} [callback=identity] The function called per iteration.\n     * @param {Mixed} [accumulator] The custom accumulator value.\n     * @param {Mixed} [thisArg] The `this` binding of `callback`.\n     * @returns {Mixed} Returns the accumulated value.\n     * @example\n     *\n     * var squares = _.transform([1, 2, 3, 4, 5, 6, 7, 8, 9, 10], function(result, num) {\n     *   num *= num;\n     *   if (num % 2) {\n     *     return result.push(num) < 3;\n     *   }\n     * });\n     * // => [1, 9, 25]\n     *\n     * var mapped = _.transform({ 'a': 1, 'b': 2, 'c': 3 }, function(result, num, key) {\n     *   result[key] = num * 3;\n     * });\n     * // => { 'a': 3, 'b': 6, 'c': 9 }\n     */\n    function transform(object, callback, accumulator, thisArg) {\n      var isArr = isArray(object);\n      callback = lodash.createCallback(callback, thisArg, 4);\n\n      if (accumulator == null) {\n        if (isArr) {\n          accumulator = [];\n        } else {\n          var ctor = object && object.constructor,\n              proto = ctor && ctor.prototype;\n\n          accumulator = createObject(proto);\n        }\n      }\n      (isArr ? forEach : forOwn)(object, function(value, index, object) {\n        return callback(accumulator, value, index, object);\n      });\n      return accumulator;\n    }\n\n    /**\n     * Creates an array composed of the own enumerable property values of `object`.\n     *\n     * @static\n     * @memberOf _\n     * @category Objects\n     * @param {Object} object The object to inspect.\n     * @returns {Array} Returns a new array of property values.\n     * @example\n     *\n     * _.values({ 'one': 1, 'two': 2, 'three': 3 });\n     * // => [1, 2, 3] (order is not guaranteed)\n     */\n    function values(object) {\n      var index = -1,\n          props = keys(object),\n          length = props.length,\n          result = Array(length);\n\n      while (++index < length) {\n        result[index] = object[props[index]];\n      }\n      return result;\n    }\n\n    /*--------------------------------------------------------------------------*/\n\n    /**\n     * Creates an array of elements from the specified indexes, or keys, of the\n     * `collection`. Indexes may be specified as individual arguments or as arrays\n     * of indexes.\n     *\n     * @static\n     * @memberOf _\n     * @category Collections\n     * @param {Array|Object|String} collection The collection to iterate over.\n     * @param {Array|Number|String} [index1, index2, ...] The indexes of\n     *  `collection` to retrieve, either as individual arguments or arrays.\n     * @returns {Array} Returns a new array of elements corresponding to the\n     *  provided indexes.\n     * @example\n     *\n     * _.at(['a', 'b', 'c', 'd', 'e'], [0, 2, 4]);\n     * // => ['a', 'c', 'e']\n     *\n     * _.at(['moe', 'larry', 'curly'], 0, 2);\n     * // => ['moe', 'curly']\n     */\n    function at(collection) {\n      var index = -1,\n          props = concat.apply(arrayRef, nativeSlice.call(arguments, 1)),\n          length = props.length,\n          result = Array(length);\n\n      while(++index < length) {\n        result[index] = collection[props[index]];\n      }\n      return result;\n    }\n\n    /**\n     * Checks if a given `target` element is present in a `collection` using strict\n     * equality for comparisons, i.e. `===`. If `fromIndex` is negative, it is used\n     * as the offset from the end of the collection.\n     *\n     * @static\n     * @memberOf _\n     * @alias include\n     * @category Collections\n     * @param {Array|Object|String} collection The collection to iterate over.\n     * @param {Mixed} target The value to check for.\n     * @param {Number} [fromIndex=0] The index to search from.\n     * @returns {Boolean} Returns `true` if the `target` element is found, else `false`.\n     * @example\n     *\n     * _.contains([1, 2, 3], 1);\n     * // => true\n     *\n     * _.contains([1, 2, 3], 1, 2);\n     * // => false\n     *\n     * _.contains({ 'name': 'moe', 'age': 40 }, 'moe');\n     * // => true\n     *\n     * _.contains('curly', 'ur');\n     * // => true\n     */\n    function contains(collection, target, fromIndex) {\n      var index = -1,\n          indexOf = getIndexOf(),\n          length = collection ? collection.length : 0,\n          result = false;\n\n      fromIndex = (fromIndex < 0 ? nativeMax(0, length + fromIndex) : fromIndex) || 0;\n      if (length && typeof length == 'number') {\n        result = (isString(collection)\n          ? collection.indexOf(target, fromIndex)\n          : indexOf(collection, target, fromIndex)\n        ) > -1;\n      } else {\n        forOwn(collection, function(value) {\n          if (++index >= fromIndex) {\n            return !(result = value === target);\n          }\n        });\n      }\n      return result;\n    }\n\n    /**\n     * Creates an object composed of keys returned from running each element of the\n     * `collection` through the given `callback`. The corresponding value of each key\n     * is the number of times the key was returned by the `callback`. The `callback`\n     * is bound to `thisArg` and invoked with three arguments; (value, index|key, collection).\n     *\n     * If a property name is passed for `callback`, the created \"_.pluck\" style\n     * callback will return the property value of the given element.\n     *\n     * If an object is passed for `callback`, the created \"_.where\" style callback\n     * will return `true` for elements that have the properties of the given object,\n     * else `false`.\n     *\n     * @static\n     * @memberOf _\n     * @category Collections\n     * @param {Array|Object|String} collection The collection to iterate over.\n     * @param {Function|Object|String} [callback=identity] The function called per\n     *  iteration. If a property name or object is passed, it will be used to create\n     *  a \"_.pluck\" or \"_.where\" style callback, respectively.\n     * @param {Mixed} [thisArg] The `this` binding of `callback`.\n     * @returns {Object} Returns the composed aggregate object.\n     * @example\n     *\n     * _.countBy([4.3, 6.1, 6.4], function(num) { return Math.floor(num); });\n     * // => { '4': 1, '6': 2 }\n     *\n     * _.countBy([4.3, 6.1, 6.4], function(num) { return this.floor(num); }, Math);\n     * // => { '4': 1, '6': 2 }\n     *\n     * _.countBy(['one', 'two', 'three'], 'length');\n     * // => { '3': 2, '5': 1 }\n     */\n    function countBy(collection, callback, thisArg) {\n      var result = {};\n      callback = lodash.createCallback(callback, thisArg);\n\n      forEach(collection, function(value, key, collection) {\n        key = String(callback(value, key, collection));\n        (hasOwnProperty.call(result, key) ? result[key]++ : result[key] = 1);\n      });\n      return result;\n    }\n\n    /**\n     * Checks if the `callback` returns a truthy value for **all** elements of a\n     * `collection`. The `callback` is bound to `thisArg` and invoked with three\n     * arguments; (value, index|key, collection).\n     *\n     * If a property name is passed for `callback`, the created \"_.pluck\" style\n     * callback will return the property value of the given element.\n     *\n     * If an object is passed for `callback`, the created \"_.where\" style callback\n     * will return `true` for elements that have the properties of the given object,\n     * else `false`.\n     *\n     * @static\n     * @memberOf _\n     * @alias all\n     * @category Collections\n     * @param {Array|Object|String} collection The collection to iterate over.\n     * @param {Function|Object|String} [callback=identity] The function called per\n     *  iteration. If a property name or object is passed, it will be used to create\n     *  a \"_.pluck\" or \"_.where\" style callback, respectively.\n     * @param {Mixed} [thisArg] The `this` binding of `callback`.\n     * @returns {Boolean} Returns `true` if all elements pass the callback check,\n     *  else `false`.\n     * @example\n     *\n     * _.every([true, 1, null, 'yes'], Boolean);\n     * // => false\n     *\n     * var stooges = [\n     *   { 'name': 'moe', 'age': 40 },\n     *   { 'name': 'larry', 'age': 50 }\n     * ];\n     *\n     * // using \"_.pluck\" callback shorthand\n     * _.every(stooges, 'age');\n     * // => true\n     *\n     * // using \"_.where\" callback shorthand\n     * _.every(stooges, { 'age': 50 });\n     * // => false\n     */\n    function every(collection, callback, thisArg) {\n      var result = true;\n      callback = lodash.createCallback(callback, thisArg);\n\n      var index = -1,\n          length = collection ? collection.length : 0;\n\n      if (typeof length == 'number') {\n        while (++index < length) {\n          if (!(result = !!callback(collection[index], index, collection))) {\n            break;\n          }\n        }\n      } else {\n        forOwn(collection, function(value, index, collection) {\n          return (result = !!callback(value, index, collection));\n        });\n      }\n      return result;\n    }\n\n    /**\n     * Examines each element in a `collection`, returning an array of all elements\n     * the `callback` returns truthy for. The `callback` is bound to `thisArg` and\n     * invoked with three arguments; (value, index|key, collection).\n     *\n     * If a property name is passed for `callback`, the created \"_.pluck\" style\n     * callback will return the property value of the given element.\n     *\n     * If an object is passed for `callback`, the created \"_.where\" style callback\n     * will return `true` for elements that have the properties of the given object,\n     * else `false`.\n     *\n     * @static\n     * @memberOf _\n     * @alias select\n     * @category Collections\n     * @param {Array|Object|String} collection The collection to iterate over.\n     * @param {Function|Object|String} [callback=identity] The function called per\n     *  iteration. If a property name or object is passed, it will be used to create\n     *  a \"_.pluck\" or \"_.where\" style callback, respectively.\n     * @param {Mixed} [thisArg] The `this` binding of `callback`.\n     * @returns {Array} Returns a new array of elements that passed the callback check.\n     * @example\n     *\n     * var evens = _.filter([1, 2, 3, 4, 5, 6], function(num) { return num % 2 == 0; });\n     * // => [2, 4, 6]\n     *\n     * var food = [\n     *   { 'name': 'apple',  'organic': false, 'type': 'fruit' },\n     *   { 'name': 'carrot', 'organic': true,  'type': 'vegetable' }\n     * ];\n     *\n     * // using \"_.pluck\" callback shorthand\n     * _.filter(food, 'organic');\n     * // => [{ 'name': 'carrot', 'organic': true, 'type': 'vegetable' }]\n     *\n     * // using \"_.where\" callback shorthand\n     * _.filter(food, { 'type': 'fruit' });\n     * // => [{ 'name': 'apple', 'organic': false, 'type': 'fruit' }]\n     */\n    function filter(collection, callback, thisArg) {\n      var result = [];\n      callback = lodash.createCallback(callback, thisArg);\n\n      var index = -1,\n          length = collection ? collection.length : 0;\n\n      if (typeof length == 'number') {\n        while (++index < length) {\n          var value = collection[index];\n          if (callback(value, index, collection)) {\n            result.push(value);\n          }\n        }\n      } else {\n        forOwn(collection, function(value, index, collection) {\n          if (callback(value, index, collection)) {\n            result.push(value);\n          }\n        });\n      }\n      return result;\n    }\n\n    /**\n     * Examines each element in a `collection`, returning the first that the `callback`\n     * returns truthy for. The `callback` is bound to `thisArg` and invoked with three\n     * arguments; (value, index|key, collection).\n     *\n     * If a property name is passed for `callback`, the created \"_.pluck\" style\n     * callback will return the property value of the given element.\n     *\n     * If an object is passed for `callback`, the created \"_.where\" style callback\n     * will return `true` for elements that have the properties of the given object,\n     * else `false`.\n     *\n     * @static\n     * @memberOf _\n     * @alias detect, findWhere\n     * @category Collections\n     * @param {Array|Object|String} collection The collection to iterate over.\n     * @param {Function|Object|String} [callback=identity] The function called per\n     *  iteration. If a property name or object is passed, it will be used to create\n     *  a \"_.pluck\" or \"_.where\" style callback, respectively.\n     * @param {Mixed} [thisArg] The `this` binding of `callback`.\n     * @returns {Mixed} Returns the found element, else `undefined`.\n     * @example\n     *\n     * _.find([1, 2, 3, 4], function(num) {\n     *   return num % 2 == 0;\n     * });\n     * // => 2\n     *\n     * var food = [\n     *   { 'name': 'apple',  'organic': false, 'type': 'fruit' },\n     *   { 'name': 'banana', 'organic': true,  'type': 'fruit' },\n     *   { 'name': 'beet',   'organic': false, 'type': 'vegetable' }\n     * ];\n     *\n     * // using \"_.where\" callback shorthand\n     * _.find(food, { 'type': 'vegetable' });\n     * // => { 'name': 'beet', 'organic': false, 'type': 'vegetable' }\n     *\n     * // using \"_.pluck\" callback shorthand\n     * _.find(food, 'organic');\n     * // => { 'name': 'banana', 'organic': true, 'type': 'fruit' }\n     */\n    function find(collection, callback, thisArg) {\n      callback = lodash.createCallback(callback, thisArg);\n\n      var index = -1,\n          length = collection ? collection.length : 0;\n\n      if (typeof length == 'number') {\n        while (++index < length) {\n          var value = collection[index];\n          if (callback(value, index, collection)) {\n            return value;\n          }\n        }\n      } else {\n        var result;\n        forOwn(collection, function(value, index, collection) {\n          if (callback(value, index, collection)) {\n            result = value;\n            return false;\n          }\n        });\n        return result;\n      }\n    }\n\n    /**\n     * Iterates over a `collection`, executing the `callback` for each element in\n     * the `collection`. The `callback` is bound to `thisArg` and invoked with three\n     * arguments; (value, index|key, collection). Callbacks may exit iteration early\n     * by explicitly returning `false`.\n     *\n     * @static\n     * @memberOf _\n     * @alias each\n     * @category Collections\n     * @param {Array|Object|String} collection The collection to iterate over.\n     * @param {Function} [callback=identity] The function called per iteration.\n     * @param {Mixed} [thisArg] The `this` binding of `callback`.\n     * @returns {Array|Object|String} Returns `collection`.\n     * @example\n     *\n     * _([1, 2, 3]).forEach(alert).join(',');\n     * // => alerts each number and returns '1,2,3'\n     *\n     * _.forEach({ 'one': 1, 'two': 2, 'three': 3 }, alert);\n     * // => alerts each number value (order is not guaranteed)\n     */\n    function forEach(collection, callback, thisArg) {\n      var index = -1,\n          length = collection ? collection.length : 0;\n\n      callback = callback && typeof thisArg == 'undefined' ? callback : lodash.createCallback(callback, thisArg);\n      if (typeof length == 'number') {\n        while (++index < length) {\n          if (callback(collection[index], index, collection) === false) {\n            break;\n          }\n        }\n      } else {\n        forOwn(collection, callback);\n      }\n      return collection;\n    }\n\n    /**\n     * Creates an object composed of keys returned from running each element of the\n     * `collection` through the `callback`. The corresponding value of each key is\n     * an array of elements passed to `callback` that returned the key. The `callback`\n     * is bound to `thisArg` and invoked with three arguments; (value, index|key, collection).\n     *\n     * If a property name is passed for `callback`, the created \"_.pluck\" style\n     * callback will return the property value of the given element.\n     *\n     * If an object is passed for `callback`, the created \"_.where\" style callback\n     * will return `true` for elements that have the properties of the given object,\n     * else `false`\n     *\n     * @static\n     * @memberOf _\n     * @category Collections\n     * @param {Array|Object|String} collection The collection to iterate over.\n     * @param {Function|Object|String} [callback=identity] The function called per\n     *  iteration. If a property name or object is passed, it will be used to create\n     *  a \"_.pluck\" or \"_.where\" style callback, respectively.\n     * @param {Mixed} [thisArg] The `this` binding of `callback`.\n     * @returns {Object} Returns the composed aggregate object.\n     * @example\n     *\n     * _.groupBy([4.2, 6.1, 6.4], function(num) { return Math.floor(num); });\n     * // => { '4': [4.2], '6': [6.1, 6.4] }\n     *\n     * _.groupBy([4.2, 6.1, 6.4], function(num) { return this.floor(num); }, Math);\n     * // => { '4': [4.2], '6': [6.1, 6.4] }\n     *\n     * // using \"_.pluck\" callback shorthand\n     * _.groupBy(['one', 'two', 'three'], 'length');\n     * // => { '3': ['one', 'two'], '5': ['three'] }\n     */\n    function groupBy(collection, callback, thisArg) {\n      var result = {};\n      callback = lodash.createCallback(callback, thisArg);\n\n      forEach(collection, function(value, key, collection) {\n        key = String(callback(value, key, collection));\n        (hasOwnProperty.call(result, key) ? result[key] : result[key] = []).push(value);\n      });\n      return result;\n    }\n\n    /**\n     * Invokes the method named by `methodName` on each element in the `collection`,\n     * returning an array of the results of each invoked method. Additional arguments\n     * will be passed to each invoked method. If `methodName` is a function, it will\n     * be invoked for, and `this` bound to, each element in the `collection`.\n     *\n     * @static\n     * @memberOf _\n     * @category Collections\n     * @param {Array|Object|String} collection The collection to iterate over.\n     * @param {Function|String} methodName The name of the method to invoke or\n     *  the function invoked per iteration.\n     * @param {Mixed} [arg1, arg2, ...] Arguments to invoke the method with.\n     * @returns {Array} Returns a new array of the results of each invoked method.\n     * @example\n     *\n     * _.invoke([[5, 1, 7], [3, 2, 1]], 'sort');\n     * // => [[1, 5, 7], [1, 2, 3]]\n     *\n     * _.invoke([123, 456], String.prototype.split, '');\n     * // => [['1', '2', '3'], ['4', '5', '6']]\n     */\n    function invoke(collection, methodName) {\n      var args = nativeSlice.call(arguments, 2),\n          index = -1,\n          isFunc = typeof methodName == 'function',\n          length = collection ? collection.length : 0,\n          result = Array(typeof length == 'number' ? length : 0);\n\n      forEach(collection, function(value) {\n        result[++index] = (isFunc ? methodName : value[methodName]).apply(value, args);\n      });\n      return result;\n    }\n\n    /**\n     * Creates an array of values by running each element in the `collection`\n     * through the `callback`. The `callback` is bound to `thisArg` and invoked with\n     * three arguments; (value, index|key, collection).\n     *\n     * If a property name is passed for `callback`, the created \"_.pluck\" style\n     * callback will return the property value of the given element.\n     *\n     * If an object is passed for `callback`, the created \"_.where\" style callback\n     * will return `true` for elements that have the properties of the given object,\n     * else `false`.\n     *\n     * @static\n     * @memberOf _\n     * @alias collect\n     * @category Collections\n     * @param {Array|Object|String} collection The collection to iterate over.\n     * @param {Function|Object|String} [callback=identity] The function called per\n     *  iteration. If a property name or object is passed, it will be used to create\n     *  a \"_.pluck\" or \"_.where\" style callback, respectively.\n     * @param {Mixed} [thisArg] The `this` binding of `callback`.\n     * @returns {Array} Returns a new array of the results of each `callback` execution.\n     * @example\n     *\n     * _.map([1, 2, 3], function(num) { return num * 3; });\n     * // => [3, 6, 9]\n     *\n     * _.map({ 'one': 1, 'two': 2, 'three': 3 }, function(num) { return num * 3; });\n     * // => [3, 6, 9] (order is not guaranteed)\n     *\n     * var stooges = [\n     *   { 'name': 'moe', 'age': 40 },\n     *   { 'name': 'larry', 'age': 50 }\n     * ];\n     *\n     * // using \"_.pluck\" callback shorthand\n     * _.map(stooges, 'name');\n     * // => ['moe', 'larry']\n     */\n    function map(collection, callback, thisArg) {\n      var index = -1,\n          length = collection ? collection.length : 0;\n\n      callback = lodash.createCallback(callback, thisArg);\n      if (typeof length == 'number') {\n        var result = Array(length);\n        while (++index < length) {\n          result[index] = callback(collection[index], index, collection);\n        }\n      } else {\n        result = [];\n        forOwn(collection, function(value, key, collection) {\n          result[++index] = callback(value, key, collection);\n        });\n      }\n      return result;\n    }\n\n    /**\n     * Retrieves the maximum value of an `array`. If `callback` is passed,\n     * it will be executed for each value in the `array` to generate the\n     * criterion by which the value is ranked. The `callback` is bound to\n     * `thisArg` and invoked with three arguments; (value, index, collection).\n     *\n     * If a property name is passed for `callback`, the created \"_.pluck\" style\n     * callback will return the property value of the given element.\n     *\n     * If an object is passed for `callback`, the created \"_.where\" style callback\n     * will return `true` for elements that have the properties of the given object,\n     * else `false`.\n     *\n     * @static\n     * @memberOf _\n     * @category Collections\n     * @param {Array|Object|String} collection The collection to iterate over.\n     * @param {Function|Object|String} [callback=identity] The function called per\n     *  iteration. If a property name or object is passed, it will be used to create\n     *  a \"_.pluck\" or \"_.where\" style callback, respectively.\n     * @param {Mixed} [thisArg] The `this` binding of `callback`.\n     * @returns {Mixed} Returns the maximum value.\n     * @example\n     *\n     * _.max([4, 2, 8, 6]);\n     * // => 8\n     *\n     * var stooges = [\n     *   { 'name': 'moe', 'age': 40 },\n     *   { 'name': 'larry', 'age': 50 }\n     * ];\n     *\n     * _.max(stooges, function(stooge) { return stooge.age; });\n     * // => { 'name': 'larry', 'age': 50 };\n     *\n     * // using \"_.pluck\" callback shorthand\n     * _.max(stooges, 'age');\n     * // => { 'name': 'larry', 'age': 50 };\n     */\n    function max(collection, callback, thisArg) {\n      var computed = -Infinity,\n          result = computed;\n\n      if (!callback && isArray(collection)) {\n        var index = -1,\n            length = collection.length;\n\n        while (++index < length) {\n          var value = collection[index];\n          if (value > result) {\n            result = value;\n          }\n        }\n      } else {\n        callback = (!callback && isString(collection))\n          ? charAtCallback\n          : lodash.createCallback(callback, thisArg);\n\n        forEach(collection, function(value, index, collection) {\n          var current = callback(value, index, collection);\n          if (current > computed) {\n            computed = current;\n            result = value;\n          }\n        });\n      }\n      return result;\n    }\n\n    /**\n     * Retrieves the minimum value of an `array`. If `callback` is passed,\n     * it will be executed for each value in the `array` to generate the\n     * criterion by which the value is ranked. The `callback` is bound to `thisArg`\n     * and invoked with three arguments; (value, index, collection).\n     *\n     * If a property name is passed for `callback`, the created \"_.pluck\" style\n     * callback will return the property value of the given element.\n     *\n     * If an object is passed for `callback`, the created \"_.where\" style callback\n     * will return `true` for elements that have the properties of the given object,\n     * else `false`.\n     *\n     * @static\n     * @memberOf _\n     * @category Collections\n     * @param {Array|Object|String} collection The collection to iterate over.\n     * @param {Function|Object|String} [callback=identity] The function called per\n     *  iteration. If a property name or object is passed, it will be used to create\n     *  a \"_.pluck\" or \"_.where\" style callback, respectively.\n     * @param {Mixed} [thisArg] The `this` binding of `callback`.\n     * @returns {Mixed} Returns the minimum value.\n     * @example\n     *\n     * _.min([4, 2, 8, 6]);\n     * // => 2\n     *\n     * var stooges = [\n     *   { 'name': 'moe', 'age': 40 },\n     *   { 'name': 'larry', 'age': 50 }\n     * ];\n     *\n     * _.min(stooges, function(stooge) { return stooge.age; });\n     * // => { 'name': 'moe', 'age': 40 };\n     *\n     * // using \"_.pluck\" callback shorthand\n     * _.min(stooges, 'age');\n     * // => { 'name': 'moe', 'age': 40 };\n     */\n    function min(collection, callback, thisArg) {\n      var computed = Infinity,\n          result = computed;\n\n      if (!callback && isArray(collection)) {\n        var index = -1,\n            length = collection.length;\n\n        while (++index < length) {\n          var value = collection[index];\n          if (value < result) {\n            result = value;\n          }\n        }\n      } else {\n        callback = (!callback && isString(collection))\n          ? charAtCallback\n          : lodash.createCallback(callback, thisArg);\n\n        forEach(collection, function(value, index, collection) {\n          var current = callback(value, index, collection);\n          if (current < computed) {\n            computed = current;\n            result = value;\n          }\n        });\n      }\n      return result;\n    }\n\n    /**\n     * Retrieves the value of a specified property from all elements in the `collection`.\n     *\n     * @static\n     * @memberOf _\n     * @type Function\n     * @category Collections\n     * @param {Array|Object|String} collection The collection to iterate over.\n     * @param {String} property The property to pluck.\n     * @returns {Array} Returns a new array of property values.\n     * @example\n     *\n     * var stooges = [\n     *   { 'name': 'moe', 'age': 40 },\n     *   { 'name': 'larry', 'age': 50 }\n     * ];\n     *\n     * _.pluck(stooges, 'name');\n     * // => ['moe', 'larry']\n     */\n    function pluck(collection, property) {\n      var index = -1,\n          length = collection ? collection.length : 0;\n\n      if (typeof length == 'number') {\n        var result = Array(length);\n        while (++index < length) {\n          result[index] = collection[index][property];\n        }\n      }\n      return result || map(collection, property);\n    }\n\n    /**\n     * Reduces a `collection` to a value which is the accumulated result of running\n     * each element in the `collection` through the `callback`, where each successive\n     * `callback` execution consumes the return value of the previous execution.\n     * If `accumulator` is not passed, the first element of the `collection` will be\n     * used as the initial `accumulator` value. The `callback` is bound to `thisArg`\n     * and invoked with four arguments; (accumulator, value, index|key, collection).\n     *\n     * @static\n     * @memberOf _\n     * @alias foldl, inject\n     * @category Collections\n     * @param {Array|Object|String} collection The collection to iterate over.\n     * @param {Function} [callback=identity] The function called per iteration.\n     * @param {Mixed} [accumulator] Initial value of the accumulator.\n     * @param {Mixed} [thisArg] The `this` binding of `callback`.\n     * @returns {Mixed} Returns the accumulated value.\n     * @example\n     *\n     * var sum = _.reduce([1, 2, 3], function(sum, num) {\n     *   return sum + num;\n     * });\n     * // => 6\n     *\n     * var mapped = _.reduce({ 'a': 1, 'b': 2, 'c': 3 }, function(result, num, key) {\n     *   result[key] = num * 3;\n     *   return result;\n     * }, {});\n     * // => { 'a': 3, 'b': 6, 'c': 9 }\n     */\n    function reduce(collection, callback, accumulator, thisArg) {\n      if (!collection) return accumulator;\n      var noaccum = arguments.length < 3;\n      callback = lodash.createCallback(callback, thisArg, 4);\n\n      var index = -1,\n          length = collection.length;\n\n      if (typeof length == 'number') {\n        if (noaccum) {\n          accumulator = collection[++index];\n        }\n        while (++index < length) {\n          accumulator = callback(accumulator, collection[index], index, collection);\n        }\n      } else {\n        forOwn(collection, function(value, index, collection) {\n          accumulator = noaccum\n            ? (noaccum = false, value)\n            : callback(accumulator, value, index, collection)\n        });\n      }\n      return accumulator;\n    }\n\n    /**\n     * This method is similar to `_.reduce`, except that it iterates over a\n     * `collection` from right to left.\n     *\n     * @static\n     * @memberOf _\n     * @alias foldr\n     * @category Collections\n     * @param {Array|Object|String} collection The collection to iterate over.\n     * @param {Function} [callback=identity] The function called per iteration.\n     * @param {Mixed} [accumulator] Initial value of the accumulator.\n     * @param {Mixed} [thisArg] The `this` binding of `callback`.\n     * @returns {Mixed} Returns the accumulated value.\n     * @example\n     *\n     * var list = [[0, 1], [2, 3], [4, 5]];\n     * var flat = _.reduceRight(list, function(a, b) { return a.concat(b); }, []);\n     * // => [4, 5, 2, 3, 0, 1]\n     */\n    function reduceRight(collection, callback, accumulator, thisArg) {\n      var iterable = collection,\n          length = collection ? collection.length : 0,\n          noaccum = arguments.length < 3;\n\n      if (typeof length != 'number') {\n        var props = keys(collection);\n        length = props.length;\n      }\n      callback = lodash.createCallback(callback, thisArg, 4);\n      forEach(collection, function(value, index, collection) {\n        index = props ? props[--length] : --length;\n        accumulator = noaccum\n          ? (noaccum = false, iterable[index])\n          : callback(accumulator, iterable[index], index, collection);\n      });\n      return accumulator;\n    }\n\n    /**\n     * The opposite of `_.filter`, this method returns the elements of a\n     * `collection` that `callback` does **not** return truthy for.\n     *\n     * If a property name is passed for `callback`, the created \"_.pluck\" style\n     * callback will return the property value of the given element.\n     *\n     * If an object is passed for `callback`, the created \"_.where\" style callback\n     * will return `true` for elements that have the properties of the given object,\n     * else `false`.\n     *\n     * @static\n     * @memberOf _\n     * @category Collections\n     * @param {Array|Object|String} collection The collection to iterate over.\n     * @param {Function|Object|String} [callback=identity] The function called per\n     *  iteration. If a property name or object is passed, it will be used to create\n     *  a \"_.pluck\" or \"_.where\" style callback, respectively.\n     * @param {Mixed} [thisArg] The `this` binding of `callback`.\n     * @returns {Array} Returns a new array of elements that did **not** pass the\n     *  callback check.\n     * @example\n     *\n     * var odds = _.reject([1, 2, 3, 4, 5, 6], function(num) { return num % 2 == 0; });\n     * // => [1, 3, 5]\n     *\n     * var food = [\n     *   { 'name': 'apple',  'organic': false, 'type': 'fruit' },\n     *   { 'name': 'carrot', 'organic': true,  'type': 'vegetable' }\n     * ];\n     *\n     * // using \"_.pluck\" callback shorthand\n     * _.reject(food, 'organic');\n     * // => [{ 'name': 'apple', 'organic': false, 'type': 'fruit' }]\n     *\n     * // using \"_.where\" callback shorthand\n     * _.reject(food, { 'type': 'fruit' });\n     * // => [{ 'name': 'carrot', 'organic': true, 'type': 'vegetable' }]\n     */\n    function reject(collection, callback, thisArg) {\n      callback = lodash.createCallback(callback, thisArg);\n      return filter(collection, function(value, index, collection) {\n        return !callback(value, index, collection);\n      });\n    }\n\n    /**\n     * Creates an array of shuffled `array` values, using a version of the\n     * Fisher-Yates shuffle. See http://en.wikipedia.org/wiki/Fisher-Yates_shuffle.\n     *\n     * @static\n     * @memberOf _\n     * @category Collections\n     * @param {Array|Object|String} collection The collection to shuffle.\n     * @returns {Array} Returns a new shuffled collection.\n     * @example\n     *\n     * _.shuffle([1, 2, 3, 4, 5, 6]);\n     * // => [4, 1, 6, 3, 5, 2]\n     */\n    function shuffle(collection) {\n      var index = -1,\n          length = collection ? collection.length : 0,\n          result = Array(typeof length == 'number' ? length : 0);\n\n      forEach(collection, function(value) {\n        var rand = floor(nativeRandom() * (++index + 1));\n        result[index] = result[rand];\n        result[rand] = value;\n      });\n      return result;\n    }\n\n    /**\n     * Gets the size of the `collection` by returning `collection.length` for arrays\n     * and array-like objects or the number of own enumerable properties for objects.\n     *\n     * @static\n     * @memberOf _\n     * @category Collections\n     * @param {Array|Object|String} collection The collection to inspect.\n     * @returns {Number} Returns `collection.length` or number of own enumerable properties.\n     * @example\n     *\n     * _.size([1, 2]);\n     * // => 2\n     *\n     * _.size({ 'one': 1, 'two': 2, 'three': 3 });\n     * // => 3\n     *\n     * _.size('curly');\n     * // => 5\n     */\n    function size(collection) {\n      var length = collection ? collection.length : 0;\n      return typeof length == 'number' ? length : keys(collection).length;\n    }\n\n    /**\n     * Checks if the `callback` returns a truthy value for **any** element of a\n     * `collection`. The function returns as soon as it finds passing value, and\n     * does not iterate over the entire `collection`. The `callback` is bound to\n     * `thisArg` and invoked with three arguments; (value, index|key, collection).\n     *\n     * If a property name is passed for `callback`, the created \"_.pluck\" style\n     * callback will return the property value of the given element.\n     *\n     * If an object is passed for `callback`, the created \"_.where\" style callback\n     * will return `true` for elements that have the properties of the given object,\n     * else `false`.\n     *\n     * @static\n     * @memberOf _\n     * @alias any\n     * @category Collections\n     * @param {Array|Object|String} collection The collection to iterate over.\n     * @param {Function|Object|String} [callback=identity] The function called per\n     *  iteration. If a property name or object is passed, it will be used to create\n     *  a \"_.pluck\" or \"_.where\" style callback, respectively.\n     * @param {Mixed} [thisArg] The `this` binding of `callback`.\n     * @returns {Boolean} Returns `true` if any element passes the callback check,\n     *  else `false`.\n     * @example\n     *\n     * _.some([null, 0, 'yes', false], Boolean);\n     * // => true\n     *\n     * var food = [\n     *   { 'name': 'apple',  'organic': false, 'type': 'fruit' },\n     *   { 'name': 'carrot', 'organic': true,  'type': 'vegetable' }\n     * ];\n     *\n     * // using \"_.pluck\" callback shorthand\n     * _.some(food, 'organic');\n     * // => true\n     *\n     * // using \"_.where\" callback shorthand\n     * _.some(food, { 'type': 'meat' });\n     * // => false\n     */\n    function some(collection, callback, thisArg) {\n      var result;\n      callback = lodash.createCallback(callback, thisArg);\n\n      var index = -1,\n          length = collection ? collection.length : 0;\n\n      if (typeof length == 'number') {\n        while (++index < length) {\n          if ((result = callback(collection[index], index, collection))) {\n            break;\n          }\n        }\n      } else {\n        forOwn(collection, function(value, index, collection) {\n          return !(result = callback(value, index, collection));\n        });\n      }\n      return !!result;\n    }\n\n    /**\n     * Creates an array of elements, sorted in ascending order by the results of\n     * running each element in the `collection` through the `callback`. This method\n     * performs a stable sort, that is, it will preserve the original sort order of\n     * equal elements. The `callback` is bound to `thisArg` and invoked with three\n     * arguments; (value, index|key, collection).\n     *\n     * If a property name is passed for `callback`, the created \"_.pluck\" style\n     * callback will return the property value of the given element.\n     *\n     * If an object is passed for `callback`, the created \"_.where\" style callback\n     * will return `true` for elements that have the properties of the given object,\n     * else `false`.\n     *\n     * @static\n     * @memberOf _\n     * @category Collections\n     * @param {Array|Object|String} collection The collection to iterate over.\n     * @param {Function|Object|String} [callback=identity] The function called per\n     *  iteration. If a property name or object is passed, it will be used to create\n     *  a \"_.pluck\" or \"_.where\" style callback, respectively.\n     * @param {Mixed} [thisArg] The `this` binding of `callback`.\n     * @returns {Array} Returns a new array of sorted elements.\n     * @example\n     *\n     * _.sortBy([1, 2, 3], function(num) { return Math.sin(num); });\n     * // => [3, 1, 2]\n     *\n     * _.sortBy([1, 2, 3], function(num) { return this.sin(num); }, Math);\n     * // => [3, 1, 2]\n     *\n     * // using \"_.pluck\" callback shorthand\n     * _.sortBy(['banana', 'strawberry', 'apple'], 'length');\n     * // => ['apple', 'banana', 'strawberry']\n     */\n    function sortBy(collection, callback, thisArg) {\n      var index = -1,\n          length = collection ? collection.length : 0,\n          result = Array(typeof length == 'number' ? length : 0);\n\n      callback = lodash.createCallback(callback, thisArg);\n      forEach(collection, function(value, key, collection) {\n        var object = result[++index] = getObject();\n        object.criteria = callback(value, key, collection);\n        object.index = index;\n        object.value = value;\n      });\n\n      length = result.length;\n      result.sort(compareAscending);\n      while (length--) {\n        var object = result[length];\n        result[length] = object.value;\n        releaseObject(object);\n      }\n      return result;\n    }\n\n    /**\n     * Converts the `collection` to an array.\n     *\n     * @static\n     * @memberOf _\n     * @category Collections\n     * @param {Array|Object|String} collection The collection to convert.\n     * @returns {Array} Returns the new converted array.\n     * @example\n     *\n     * (function() { return _.toArray(arguments).slice(1); })(1, 2, 3, 4);\n     * // => [2, 3, 4]\n     */\n    function toArray(collection) {\n      if (collection && typeof collection.length == 'number') {\n        return slice(collection);\n      }\n      return values(collection);\n    }\n\n    /**\n     * Examines each element in a `collection`, returning an array of all elements\n     * that have the given `properties`. When checking `properties`, this method\n     * performs a deep comparison between values to determine if they are equivalent\n     * to each other.\n     *\n     * @static\n     * @memberOf _\n     * @type Function\n     * @category Collections\n     * @param {Array|Object|String} collection The collection to iterate over.\n     * @param {Object} properties The object of property values to filter by.\n     * @returns {Array} Returns a new array of elements that have the given `properties`.\n     * @example\n     *\n     * var stooges = [\n     *   { 'name': 'moe', 'age': 40 },\n     *   { 'name': 'larry', 'age': 50 }\n     * ];\n     *\n     * _.where(stooges, { 'age': 40 });\n     * // => [{ 'name': 'moe', 'age': 40 }]\n     */\n    var where = filter;\n\n    /*--------------------------------------------------------------------------*/\n\n    /**\n     * Creates an array with all falsey values of `array` removed. The values\n     * `false`, `null`, `0`, `\"\"`, `undefined` and `NaN` are all falsey.\n     *\n     * @static\n     * @memberOf _\n     * @category Arrays\n     * @param {Array} array The array to compact.\n     * @returns {Array} Returns a new filtered array.\n     * @example\n     *\n     * _.compact([0, 1, false, 2, '', 3]);\n     * // => [1, 2, 3]\n     */\n    function compact(array) {\n      var index = -1,\n          length = array ? array.length : 0,\n          result = [];\n\n      while (++index < length) {\n        var value = array[index];\n        if (value) {\n          result.push(value);\n        }\n      }\n      return result;\n    }\n\n    /**\n     * Creates an array of `array` elements not present in the other arrays\n     * using strict equality for comparisons, i.e. `===`.\n     *\n     * @static\n     * @memberOf _\n     * @category Arrays\n     * @param {Array} array The array to process.\n     * @param {Array} [array1, array2, ...] Arrays to check.\n     * @returns {Array} Returns a new array of `array` elements not present in the\n     *  other arrays.\n     * @example\n     *\n     * _.difference([1, 2, 3, 4, 5], [5, 2, 10]);\n     * // => [1, 3, 4]\n     */\n    function difference(array) {\n      var index = -1,\n          indexOf = getIndexOf(),\n          length = array ? array.length : 0,\n          seen = concat.apply(arrayRef, nativeSlice.call(arguments, 1)),\n          result = [];\n\n      var isLarge = length >= largeArraySize && indexOf === basicIndexOf;\n\n      if (isLarge) {\n        var cache = createCache(seen);\n        if (cache) {\n          indexOf = cacheIndexOf;\n          seen = cache;\n        } else {\n          isLarge = false;\n        }\n      }\n      while (++index < length) {\n        var value = array[index];\n        if (indexOf(seen, value) < 0) {\n          result.push(value);\n        }\n      }\n      if (isLarge) {\n        releaseObject(seen);\n      }\n      return result;\n    }\n\n    /**\n     * This method is similar to `_.find`, except that it returns the index of\n     * the element that passes the callback check, instead of the element itself.\n     *\n     * @static\n     * @memberOf _\n     * @category Arrays\n     * @param {Array} array The array to search.\n     * @param {Function|Object|String} [callback=identity] The function called per\n     *  iteration. If a property name or object is passed, it will be used to create\n     *  a \"_.pluck\" or \"_.where\" style callback, respectively.\n     * @param {Mixed} [thisArg] The `this` binding of `callback`.\n     * @returns {Mixed} Returns the index of the found element, else `-1`.\n     * @example\n     *\n     * _.findIndex(['apple', 'banana', 'beet'], function(food) {\n     *   return /^b/.test(food);\n     * });\n     * // => 1\n     */\n    function findIndex(array, callback, thisArg) {\n      var index = -1,\n          length = array ? array.length : 0;\n\n      callback = lodash.createCallback(callback, thisArg);\n      while (++index < length) {\n        if (callback(array[index], index, array)) {\n          return index;\n        }\n      }\n      return -1;\n    }\n\n    /**\n     * Gets the first element of the `array`. If a number `n` is passed, the first\n     * `n` elements of the `array` are returned. If a `callback` function is passed,\n     * elements at the beginning of the array are returned as long as the `callback`\n     * returns truthy. The `callback` is bound to `thisArg` and invoked with three\n     * arguments; (value, index, array).\n     *\n     * If a property name is passed for `callback`, the created \"_.pluck\" style\n     * callback will return the property value of the given element.\n     *\n     * If an object is passed for `callback`, the created \"_.where\" style callback\n     * will return `true` for elements that have the properties of the given object,\n     * else `false`.\n     *\n     * @static\n     * @memberOf _\n     * @alias head, take\n     * @category Arrays\n     * @param {Array} array The array to query.\n     * @param {Function|Object|Number|String} [callback|n] The function called\n     *  per element or the number of elements to return. If a property name or\n     *  object is passed, it will be used to create a \"_.pluck\" or \"_.where\"\n     *  style callback, respectively.\n     * @param {Mixed} [thisArg] The `this` binding of `callback`.\n     * @returns {Mixed} Returns the first element(s) of `array`.\n     * @example\n     *\n     * _.first([1, 2, 3]);\n     * // => 1\n     *\n     * _.first([1, 2, 3], 2);\n     * // => [1, 2]\n     *\n     * _.first([1, 2, 3], function(num) {\n     *   return num < 3;\n     * });\n     * // => [1, 2]\n     *\n     * var food = [\n     *   { 'name': 'banana', 'organic': true },\n     *   { 'name': 'beet',   'organic': false },\n     * ];\n     *\n     * // using \"_.pluck\" callback shorthand\n     * _.first(food, 'organic');\n     * // => [{ 'name': 'banana', 'organic': true }]\n     *\n     * var food = [\n     *   { 'name': 'apple',  'type': 'fruit' },\n     *   { 'name': 'banana', 'type': 'fruit' },\n     *   { 'name': 'beet',   'type': 'vegetable' }\n     * ];\n     *\n     * // using \"_.where\" callback shorthand\n     * _.first(food, { 'type': 'fruit' });\n     * // => [{ 'name': 'apple', 'type': 'fruit' }, { 'name': 'banana', 'type': 'fruit' }]\n     */\n    function first(array, callback, thisArg) {\n      if (array) {\n        var n = 0,\n            length = array.length;\n\n        if (typeof callback != 'number' && callback != null) {\n          var index = -1;\n          callback = lodash.createCallback(callback, thisArg);\n          while (++index < length && callback(array[index], index, array)) {\n            n++;\n          }\n        } else {\n          n = callback;\n          if (n == null || thisArg) {\n            return array[0];\n          }\n        }\n        return slice(array, 0, nativeMin(nativeMax(0, n), length));\n      }\n    }\n\n    /**\n     * Flattens a nested array (the nesting can be to any depth). If `isShallow`\n     * is truthy, `array` will only be flattened a single level. If `callback`\n     * is passed, each element of `array` is passed through a `callback` before\n     * flattening. The `callback` is bound to `thisArg` and invoked with three\n     * arguments; (value, index, array).\n     *\n     * If a property name is passed for `callback`, the created \"_.pluck\" style\n     * callback will return the property value of the given element.\n     *\n     * If an object is passed for `callback`, the created \"_.where\" style callback\n     * will return `true` for elements that have the properties of the given object,\n     * else `false`.\n     *\n     * @static\n     * @memberOf _\n     * @category Arrays\n     * @param {Array} array The array to flatten.\n     * @param {Boolean} [isShallow=false] A flag to indicate only flattening a single level.\n     * @param {Function|Object|String} [callback=identity] The function called per\n     *  iteration. If a property name or object is passed, it will be used to create\n     *  a \"_.pluck\" or \"_.where\" style callback, respectively.\n     * @param {Mixed} [thisArg] The `this` binding of `callback`.\n     * @returns {Array} Returns a new flattened array.\n     * @example\n     *\n     * _.flatten([1, [2], [3, [[4]]]]);\n     * // => [1, 2, 3, 4];\n     *\n     * _.flatten([1, [2], [3, [[4]]]], true);\n     * // => [1, 2, 3, [[4]]];\n     *\n     * var stooges = [\n     *   { 'name': 'curly', 'quotes': ['Oh, a wise guy, eh?', 'Poifect!'] },\n     *   { 'name': 'moe', 'quotes': ['Spread out!', 'You knucklehead!'] }\n     * ];\n     *\n     * // using \"_.pluck\" callback shorthand\n     * _.flatten(stooges, 'quotes');\n     * // => ['Oh, a wise guy, eh?', 'Poifect!', 'Spread out!', 'You knucklehead!']\n     */\n    var flatten = overloadWrapper(function flatten(array, isShallow, callback) {\n      var index = -1,\n          length = array ? array.length : 0,\n          result = [];\n\n      while (++index < length) {\n        var value = array[index];\n        if (callback) {\n          value = callback(value, index, array);\n        }\n        // recursively flatten arrays (susceptible to call stack limits)\n        if (isArray(value)) {\n          push.apply(result, isShallow ? value : flatten(value));\n        } else {\n          result.push(value);\n        }\n      }\n      return result;\n    });\n\n    /**\n     * Gets the index at which the first occurrence of `value` is found using\n     * strict equality for comparisons, i.e. `===`. If the `array` is already\n     * sorted, passing `true` for `fromIndex` will run a faster binary search.\n     *\n     * @static\n     * @memberOf _\n     * @category Arrays\n     * @param {Array} array The array to search.\n     * @param {Mixed} value The value to search for.\n     * @param {Boolean|Number} [fromIndex=0] The index to search from or `true` to\n     *  perform a binary search on a sorted `array`.\n     * @returns {Number} Returns the index of the matched value or `-1`.\n     * @example\n     *\n     * _.indexOf([1, 2, 3, 1, 2, 3], 2);\n     * // => 1\n     *\n     * _.indexOf([1, 2, 3, 1, 2, 3], 2, 3);\n     * // => 4\n     *\n     * _.indexOf([1, 1, 2, 2, 3, 3], 2, true);\n     * // => 2\n     */\n    function indexOf(array, value, fromIndex) {\n      if (typeof fromIndex == 'number') {\n        var length = array ? array.length : 0;\n        fromIndex = (fromIndex < 0 ? nativeMax(0, length + fromIndex) : fromIndex || 0);\n      } else if (fromIndex) {\n        var index = sortedIndex(array, value);\n        return array[index] === value ? index : -1;\n      }\n      return array ? basicIndexOf(array, value, fromIndex) : -1;\n    }\n\n    /**\n     * Gets all but the last element of `array`. If a number `n` is passed, the\n     * last `n` elements are excluded from the result. If a `callback` function\n     * is passed, elements at the end of the array are excluded from the result\n     * as long as the `callback` returns truthy. The `callback` is bound to\n     * `thisArg` and invoked with three arguments; (value, index, array).\n     *\n     * If a property name is passed for `callback`, the created \"_.pluck\" style\n     * callback will return the property value of the given element.\n     *\n     * If an object is passed for `callback`, the created \"_.where\" style callback\n     * will return `true` for elements that have the properties of the given object,\n     * else `false`.\n     *\n     * @static\n     * @memberOf _\n     * @category Arrays\n     * @param {Array} array The array to query.\n     * @param {Function|Object|Number|String} [callback|n=1] The function called\n     *  per element or the number of elements to exclude. If a property name or\n     *  object is passed, it will be used to create a \"_.pluck\" or \"_.where\"\n     *  style callback, respectively.\n     * @param {Mixed} [thisArg] The `this` binding of `callback`.\n     * @returns {Array} Returns a slice of `array`.\n     * @example\n     *\n     * _.initial([1, 2, 3]);\n     * // => [1, 2]\n     *\n     * _.initial([1, 2, 3], 2);\n     * // => [1]\n     *\n     * _.initial([1, 2, 3], function(num) {\n     *   return num > 1;\n     * });\n     * // => [1]\n     *\n     * var food = [\n     *   { 'name': 'beet',   'organic': false },\n     *   { 'name': 'carrot', 'organic': true }\n     * ];\n     *\n     * // using \"_.pluck\" callback shorthand\n     * _.initial(food, 'organic');\n     * // => [{ 'name': 'beet',   'organic': false }]\n     *\n     * var food = [\n     *   { 'name': 'banana', 'type': 'fruit' },\n     *   { 'name': 'beet',   'type': 'vegetable' },\n     *   { 'name': 'carrot', 'type': 'vegetable' }\n     * ];\n     *\n     * // using \"_.where\" callback shorthand\n     * _.initial(food, { 'type': 'vegetable' });\n     * // => [{ 'name': 'banana', 'type': 'fruit' }]\n     */\n    function initial(array, callback, thisArg) {\n      if (!array) {\n        return [];\n      }\n      var n = 0,\n          length = array.length;\n\n      if (typeof callback != 'number' && callback != null) {\n        var index = length;\n        callback = lodash.createCallback(callback, thisArg);\n        while (index-- && callback(array[index], index, array)) {\n          n++;\n        }\n      } else {\n        n = (callback == null || thisArg) ? 1 : callback || n;\n      }\n      return slice(array, 0, nativeMin(nativeMax(0, length - n), length));\n    }\n\n    /**\n     * Computes the intersection of all the passed-in arrays using strict equality\n     * for comparisons, i.e. `===`.\n     *\n     * @static\n     * @memberOf _\n     * @category Arrays\n     * @param {Array} [array1, array2, ...] Arrays to process.\n     * @returns {Array} Returns a new array of unique elements that are present\n     *  in **all** of the arrays.\n     * @example\n     *\n     * _.intersection([1, 2, 3], [101, 2, 1, 10], [2, 1]);\n     * // => [1, 2]\n     */\n    function intersection(array) {\n      var args = arguments,\n          argsLength = args.length,\n          argsIndex = -1,\n          caches = getArray(),\n          index = -1,\n          indexOf = getIndexOf(),\n          length = array ? array.length : 0,\n          result = [],\n          seen = getArray();\n\n      while (++argsIndex < argsLength) {\n        var value = args[argsIndex];\n        caches[argsIndex] = indexOf === basicIndexOf &&\n          (value ? value.length : 0) >= largeArraySize &&\n          createCache(argsIndex ? args[argsIndex] : seen);\n      }\n      outer:\n      while (++index < length) {\n        var cache = caches[0];\n        value = array[index];\n\n        if ((cache ? cacheIndexOf(cache, value) : indexOf(seen, value)) < 0) {\n          argsIndex = argsLength;\n          (cache || seen).push(value);\n          while (--argsIndex) {\n            cache = caches[argsIndex];\n            if ((cache ? cacheIndexOf(cache, value) : indexOf(args[argsIndex], value)) < 0) {\n              continue outer;\n            }\n          }\n          result.push(value);\n        }\n      }\n      while (argsLength--) {\n        cache = caches[argsLength];\n        if (cache) {\n          releaseObject(cache);\n        }\n      }\n      releaseArray(caches);\n      releaseArray(seen);\n      return result;\n    }\n\n    /**\n     * Gets the last element of the `array`. If a number `n` is passed, the\n     * last `n` elements of the `array` are returned. If a `callback` function\n     * is passed, elements at the end of the array are returned as long as the\n     * `callback` returns truthy. The `callback` is bound to `thisArg` and\n     * invoked with three arguments;(value, index, array).\n     *\n     *\n     * If a property name is passed for `callback`, the created \"_.pluck\" style\n     * callback will return the property value of the given element.\n     *\n     * If an object is passed for `callback`, the created \"_.where\" style callback\n     * will return `true` for elements that have the properties of the given object,\n     * else `false`.\n     *\n     * @static\n     * @memberOf _\n     * @category Arrays\n     * @param {Array} array The array to query.\n     * @param {Function|Object|Number|String} [callback|n] The function called\n     *  per element or the number of elements to return. If a property name or\n     *  object is passed, it will be used to create a \"_.pluck\" or \"_.where\"\n     *  style callback, respectively.\n     * @param {Mixed} [thisArg] The `this` binding of `callback`.\n     * @returns {Mixed} Returns the last element(s) of `array`.\n     * @example\n     *\n     * _.last([1, 2, 3]);\n     * // => 3\n     *\n     * _.last([1, 2, 3], 2);\n     * // => [2, 3]\n     *\n     * _.last([1, 2, 3], function(num) {\n     *   return num > 1;\n     * });\n     * // => [2, 3]\n     *\n     * var food = [\n     *   { 'name': 'beet',   'organic': false },\n     *   { 'name': 'carrot', 'organic': true }\n     * ];\n     *\n     * // using \"_.pluck\" callback shorthand\n     * _.last(food, 'organic');\n     * // => [{ 'name': 'carrot', 'organic': true }]\n     *\n     * var food = [\n     *   { 'name': 'banana', 'type': 'fruit' },\n     *   { 'name': 'beet',   'type': 'vegetable' },\n     *   { 'name': 'carrot', 'type': 'vegetable' }\n     * ];\n     *\n     * // using \"_.where\" callback shorthand\n     * _.last(food, { 'type': 'vegetable' });\n     * // => [{ 'name': 'beet', 'type': 'vegetable' }, { 'name': 'carrot', 'type': 'vegetable' }]\n     */\n    function last(array, callback, thisArg) {\n      if (array) {\n        var n = 0,\n            length = array.length;\n\n        if (typeof callback != 'number' && callback != null) {\n          var index = length;\n          callback = lodash.createCallback(callback, thisArg);\n          while (index-- && callback(array[index], index, array)) {\n            n++;\n          }\n        } else {\n          n = callback;\n          if (n == null || thisArg) {\n            return array[length - 1];\n          }\n        }\n        return slice(array, nativeMax(0, length - n));\n      }\n    }\n\n    /**\n     * Gets the index at which the last occurrence of `value` is found using strict\n     * equality for comparisons, i.e. `===`. If `fromIndex` is negative, it is used\n     * as the offset from the end of the collection.\n     *\n     * @static\n     * @memberOf _\n     * @category Arrays\n     * @param {Array} array The array to search.\n     * @param {Mixed} value The value to search for.\n     * @param {Number} [fromIndex=array.length-1] The index to search from.\n     * @returns {Number} Returns the index of the matched value or `-1`.\n     * @example\n     *\n     * _.lastIndexOf([1, 2, 3, 1, 2, 3], 2);\n     * // => 4\n     *\n     * _.lastIndexOf([1, 2, 3, 1, 2, 3], 2, 3);\n     * // => 1\n     */\n    function lastIndexOf(array, value, fromIndex) {\n      var index = array ? array.length : 0;\n      if (typeof fromIndex == 'number') {\n        index = (fromIndex < 0 ? nativeMax(0, index + fromIndex) : nativeMin(fromIndex, index - 1)) + 1;\n      }\n      while (index--) {\n        if (array[index] === value) {\n          return index;\n        }\n      }\n      return -1;\n    }\n\n    /**\n     * Creates an array of numbers (positive and/or negative) progressing from\n     * `start` up to but not including `end`.\n     *\n     * @static\n     * @memberOf _\n     * @category Arrays\n     * @param {Number} [start=0] The start of the range.\n     * @param {Number} end The end of the range.\n     * @param {Number} [step=1] The value to increment or decrement by.\n     * @returns {Array} Returns a new range array.\n     * @example\n     *\n     * _.range(10);\n     * // => [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]\n     *\n     * _.range(1, 11);\n     * // => [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]\n     *\n     * _.range(0, 30, 5);\n     * // => [0, 5, 10, 15, 20, 25]\n     *\n     * _.range(0, -10, -1);\n     * // => [0, -1, -2, -3, -4, -5, -6, -7, -8, -9]\n     *\n     * _.range(0);\n     * // => []\n     */\n    function range(start, end, step) {\n      start = +start || 0;\n      step = +step || 1;\n\n      if (end == null) {\n        end = start;\n        start = 0;\n      }\n      // use `Array(length)` so V8 will avoid the slower \"dictionary\" mode\n      // http://youtu.be/XAqIpGU8ZZk#t=17m25s\n      var index = -1,\n          length = nativeMax(0, ceil((end - start) / step)),\n          result = Array(length);\n\n      while (++index < length) {\n        result[index] = start;\n        start += step;\n      }\n      return result;\n    }\n\n    /**\n     * The opposite of `_.initial`, this method gets all but the first value of\n     * `array`. If a number `n` is passed, the first `n` values are excluded from\n     * the result. If a `callback` function is passed, elements at the beginning\n     * of the array are excluded from the result as long as the `callback` returns\n     * truthy. The `callback` is bound to `thisArg` and invoked with three\n     * arguments; (value, index, array).\n     *\n     * If a property name is passed for `callback`, the created \"_.pluck\" style\n     * callback will return the property value of the given element.\n     *\n     * If an object is passed for `callback`, the created \"_.where\" style callback\n     * will return `true` for elements that have the properties of the given object,\n     * else `false`.\n     *\n     * @static\n     * @memberOf _\n     * @alias drop, tail\n     * @category Arrays\n     * @param {Array} array The array to query.\n     * @param {Function|Object|Number|String} [callback|n=1] The function called\n     *  per element or the number of elements to exclude. If a property name or\n     *  object is passed, it will be used to create a \"_.pluck\" or \"_.where\"\n     *  style callback, respectively.\n     * @param {Mixed} [thisArg] The `this` binding of `callback`.\n     * @returns {Array} Returns a slice of `array`.\n     * @example\n     *\n     * _.rest([1, 2, 3]);\n     * // => [2, 3]\n     *\n     * _.rest([1, 2, 3], 2);\n     * // => [3]\n     *\n     * _.rest([1, 2, 3], function(num) {\n     *   return num < 3;\n     * });\n     * // => [3]\n     *\n     * var food = [\n     *   { 'name': 'banana', 'organic': true },\n     *   { 'name': 'beet',   'organic': false },\n     * ];\n     *\n     * // using \"_.pluck\" callback shorthand\n     * _.rest(food, 'organic');\n     * // => [{ 'name': 'beet', 'organic': false }]\n     *\n     * var food = [\n     *   { 'name': 'apple',  'type': 'fruit' },\n     *   { 'name': 'banana', 'type': 'fruit' },\n     *   { 'name': 'beet',   'type': 'vegetable' }\n     * ];\n     *\n     * // using \"_.where\" callback shorthand\n     * _.rest(food, { 'type': 'fruit' });\n     * // => [{ 'name': 'beet', 'type': 'vegetable' }]\n     */\n    function rest(array, callback, thisArg) {\n      if (typeof callback != 'number' && callback != null) {\n        var n = 0,\n            index = -1,\n            length = array ? array.length : 0;\n\n        callback = lodash.createCallback(callback, thisArg);\n        while (++index < length && callback(array[index], index, array)) {\n          n++;\n        }\n      } else {\n        n = (callback == null || thisArg) ? 1 : nativeMax(0, callback);\n      }\n      return slice(array, n);\n    }\n\n    /**\n     * Uses a binary search to determine the smallest index at which the `value`\n     * should be inserted into `array` in order to maintain the sort order of the\n     * sorted `array`. If `callback` is passed, it will be executed for `value` and\n     * each element in `array` to compute their sort ranking. The `callback` is\n     * bound to `thisArg` and invoked with one argument; (value).\n     *\n     * If a property name is passed for `callback`, the created \"_.pluck\" style\n     * callback will return the property value of the given element.\n     *\n     * If an object is passed for `callback`, the created \"_.where\" style callback\n     * will return `true` for elements that have the properties of the given object,\n     * else `false`.\n     *\n     * @static\n     * @memberOf _\n     * @category Arrays\n     * @param {Array} array The array to inspect.\n     * @param {Mixed} value The value to evaluate.\n     * @param {Function|Object|String} [callback=identity] The function called per\n     *  iteration. If a property name or object is passed, it will be used to create\n     *  a \"_.pluck\" or \"_.where\" style callback, respectively.\n     * @param {Mixed} [thisArg] The `this` binding of `callback`.\n     * @returns {Number} Returns the index at which the value should be inserted\n     *  into `array`.\n     * @example\n     *\n     * _.sortedIndex([20, 30, 50], 40);\n     * // => 2\n     *\n     * // using \"_.pluck\" callback shorthand\n     * _.sortedIndex([{ 'x': 20 }, { 'x': 30 }, { 'x': 50 }], { 'x': 40 }, 'x');\n     * // => 2\n     *\n     * var dict = {\n     *   'wordToNumber': { 'twenty': 20, 'thirty': 30, 'fourty': 40, 'fifty': 50 }\n     * };\n     *\n     * _.sortedIndex(['twenty', 'thirty', 'fifty'], 'fourty', function(word) {\n     *   return dict.wordToNumber[word];\n     * });\n     * // => 2\n     *\n     * _.sortedIndex(['twenty', 'thirty', 'fifty'], 'fourty', function(word) {\n     *   return this.wordToNumber[word];\n     * }, dict);\n     * // => 2\n     */\n    function sortedIndex(array, value, callback, thisArg) {\n      var low = 0,\n          high = array ? array.length : low;\n\n      // explicitly reference `identity` for better inlining in Firefox\n      callback = callback ? lodash.createCallback(callback, thisArg, 1) : identity;\n      value = callback(value);\n\n      while (low < high) {\n        var mid = (low + high) >>> 1;\n        (callback(array[mid]) < value)\n          ? low = mid + 1\n          : high = mid;\n      }\n      return low;\n    }\n\n    /**\n     * Computes the union of the passed-in arrays using strict equality for\n     * comparisons, i.e. `===`.\n     *\n     * @static\n     * @memberOf _\n     * @category Arrays\n     * @param {Array} [array1, array2, ...] Arrays to process.\n     * @returns {Array} Returns a new array of unique values, in order, that are\n     *  present in one or more of the arrays.\n     * @example\n     *\n     * _.union([1, 2, 3], [101, 2, 1, 10], [2, 1]);\n     * // => [1, 2, 3, 101, 10]\n     */\n    function union(array) {\n      if (!isArray(array)) {\n        arguments[0] = array ? nativeSlice.call(array) : arrayRef;\n      }\n      return uniq(concat.apply(arrayRef, arguments));\n    }\n\n    /**\n     * Creates a duplicate-value-free version of the `array` using strict equality\n     * for comparisons, i.e. `===`. If the `array` is already sorted, passing `true`\n     * for `isSorted` will run a faster algorithm. If `callback` is passed, each\n     * element of `array` is passed through the `callback` before uniqueness is computed.\n     * The `callback` is bound to `thisArg` and invoked with three arguments; (value, index, array).\n     *\n     * If a property name is passed for `callback`, the created \"_.pluck\" style\n     * callback will return the property value of the given element.\n     *\n     * If an object is passed for `callback`, the created \"_.where\" style callback\n     * will return `true` for elements that have the properties of the given object,\n     * else `false`.\n     *\n     * @static\n     * @memberOf _\n     * @alias unique\n     * @category Arrays\n     * @param {Array} array The array to process.\n     * @param {Boolean} [isSorted=false] A flag to indicate that the `array` is already sorted.\n     * @param {Function|Object|String} [callback=identity] The function called per\n     *  iteration. If a property name or object is passed, it will be used to create\n     *  a \"_.pluck\" or \"_.where\" style callback, respectively.\n     * @param {Mixed} [thisArg] The `this` binding of `callback`.\n     * @returns {Array} Returns a duplicate-value-free array.\n     * @example\n     *\n     * _.uniq([1, 2, 1, 3, 1]);\n     * // => [1, 2, 3]\n     *\n     * _.uniq([1, 1, 2, 2, 3], true);\n     * // => [1, 2, 3]\n     *\n     * _.uniq(['A', 'b', 'C', 'a', 'B', 'c'], function(letter) { return letter.toLowerCase(); });\n     * // => ['A', 'b', 'C']\n     *\n     * _.uniq([1, 2.5, 3, 1.5, 2, 3.5], function(num) { return this.floor(num); }, Math);\n     * // => [1, 2.5, 3]\n     *\n     * // using \"_.pluck\" callback shorthand\n     * _.uniq([{ 'x': 1 }, { 'x': 2 }, { 'x': 1 }], 'x');\n     * // => [{ 'x': 1 }, { 'x': 2 }]\n     */\n    var uniq = overloadWrapper(function(array, isSorted, callback) {\n      var index = -1,\n          indexOf = getIndexOf(),\n          length = array ? array.length : 0,\n          result = [];\n\n      var isLarge = !isSorted && length >= largeArraySize && indexOf === basicIndexOf,\n          seen = (callback || isLarge) ? getArray() : result;\n\n      if (isLarge) {\n        var cache = createCache(seen);\n        if (cache) {\n          indexOf = cacheIndexOf;\n          seen = cache;\n        } else {\n          isLarge = false;\n          seen = callback ? seen : (releaseArray(seen), result);\n        }\n      }\n      while (++index < length) {\n        var value = array[index],\n            computed = callback ? callback(value, index, array) : value;\n\n        if (isSorted\n              ? !index || seen[seen.length - 1] !== computed\n              : indexOf(seen, computed) < 0\n            ) {\n          if (callback || isLarge) {\n            seen.push(computed);\n          }\n          result.push(value);\n        }\n      }\n      if (isLarge) {\n        releaseArray(seen.array);\n        releaseObject(seen);\n      } else if (callback) {\n        releaseArray(seen);\n      }\n      return result;\n    });\n\n    /**\n     * The inverse of `_.zip`, this method splits groups of elements into arrays\n     * composed of elements from each group at their corresponding indexes.\n     *\n     * @static\n     * @memberOf _\n     * @category Arrays\n     * @param {Array} array The array to process.\n     * @returns {Array} Returns a new array of the composed arrays.\n     * @example\n     *\n     * _.unzip([['moe', 30, true], ['larry', 40, false]]);\n     * // => [['moe', 'larry'], [30, 40], [true, false]];\n     */\n    function unzip(array) {\n      var index = -1,\n          length = array ? max(pluck(array, 'length')) : 0,\n          result = Array(length < 0 ? 0 : length);\n\n      while (++index < length) {\n        result[index] = pluck(array, index);\n      }\n      return result;\n    }\n\n    /**\n     * Creates an array with all occurrences of the passed values removed using\n     * strict equality for comparisons, i.e. `===`.\n     *\n     * @static\n     * @memberOf _\n     * @category Arrays\n     * @param {Array} array The array to filter.\n     * @param {Mixed} [value1, value2, ...] Values to remove.\n     * @returns {Array} Returns a new filtered array.\n     * @example\n     *\n     * _.without([1, 2, 1, 0, 3, 1, 4], 0, 1);\n     * // => [2, 3, 4]\n     */\n    function without(array) {\n      return difference(array, nativeSlice.call(arguments, 1));\n    }\n\n    /**\n     * Groups the elements of each array at their corresponding indexes. Useful for\n     * separate data sources that are coordinated through matching array indexes.\n     * For a matrix of nested arrays, `_.zip.apply(...)` can transpose the matrix\n     * in a similar fashion.\n     *\n     * @static\n     * @memberOf _\n     * @category Arrays\n     * @param {Array} [array1, array2, ...] Arrays to process.\n     * @returns {Array} Returns a new array of grouped elements.\n     * @example\n     *\n     * _.zip(['moe', 'larry'], [30, 40], [true, false]);\n     * // => [['moe', 30, true], ['larry', 40, false]]\n     */\n    function zip(array) {\n      return array ? unzip(arguments) : [];\n    }\n\n    /**\n     * Creates an object composed from arrays of `keys` and `values`. Pass either\n     * a single two dimensional array, i.e. `[[key1, value1], [key2, value2]]`, or\n     * two arrays, one of `keys` and one of corresponding `values`.\n     *\n     * @static\n     * @memberOf _\n     * @alias object\n     * @category Arrays\n     * @param {Array} keys The array of keys.\n     * @param {Array} [values=[]] The array of values.\n     * @returns {Object} Returns an object composed of the given keys and\n     *  corresponding values.\n     * @example\n     *\n     * _.zipObject(['moe', 'larry'], [30, 40]);\n     * // => { 'moe': 30, 'larry': 40 }\n     */\n    function zipObject(keys, values) {\n      var index = -1,\n          length = keys ? keys.length : 0,\n          result = {};\n\n      while (++index < length) {\n        var key = keys[index];\n        if (values) {\n          result[key] = values[index];\n        } else {\n          result[key[0]] = key[1];\n        }\n      }\n      return result;\n    }\n\n    /*--------------------------------------------------------------------------*/\n\n    /**\n     * If `n` is greater than `0`, a function is created that is restricted to\n     * executing `func`, with the `this` binding and arguments of the created\n     * function, only after it is called `n` times. If `n` is less than `1`,\n     * `func` is executed immediately, without a `this` binding or additional\n     * arguments, and its result is returned.\n     *\n     * @static\n     * @memberOf _\n     * @category Functions\n     * @param {Number} n The number of times the function must be called before\n     * it is executed.\n     * @param {Function} func The function to restrict.\n     * @returns {Function} Returns the new restricted function.\n     * @example\n     *\n     * var renderNotes = _.after(notes.length, render);\n     * _.forEach(notes, function(note) {\n     *   note.asyncSave({ 'success': renderNotes });\n     * });\n     * // `renderNotes` is run once, after all notes have saved\n     */\n    function after(n, func) {\n      if (n < 1) {\n        return func();\n      }\n      return function() {\n        if (--n < 1) {\n          return func.apply(this, arguments);\n        }\n      };\n    }\n\n    /**\n     * Creates a function that, when called, invokes `func` with the `this`\n     * binding of `thisArg` and prepends any additional `bind` arguments to those\n     * passed to the bound function.\n     *\n     * @static\n     * @memberOf _\n     * @category Functions\n     * @param {Function} func The function to bind.\n     * @param {Mixed} [thisArg] The `this` binding of `func`.\n     * @param {Mixed} [arg1, arg2, ...] Arguments to be partially applied.\n     * @returns {Function} Returns the new bound function.\n     * @example\n     *\n     * var func = function(greeting) {\n     *   return greeting + ' ' + this.name;\n     * };\n     *\n     * func = _.bind(func, { 'name': 'moe' }, 'hi');\n     * func();\n     * // => 'hi moe'\n     */\n    function bind(func, thisArg) {\n      // use `Function#bind` if it exists and is fast\n      // (in V8 `Function#bind` is slower except when partially applied)\n      return support.fastBind || (nativeBind && arguments.length > 2)\n        ? nativeBind.call.apply(nativeBind, arguments)\n        : createBound(func, thisArg, nativeSlice.call(arguments, 2));\n    }\n\n    /**\n     * Binds methods on `object` to `object`, overwriting the existing method.\n     * Method names may be specified as individual arguments or as arrays of method\n     * names. If no method names are provided, all the function properties of `object`\n     * will be bound.\n     *\n     * @static\n     * @memberOf _\n     * @category Functions\n     * @param {Object} object The object to bind and assign the bound methods to.\n     * @param {String} [methodName1, methodName2, ...] Method names on the object to bind.\n     * @returns {Object} Returns `object`.\n     * @example\n     *\n     * var view = {\n     *  'label': 'docs',\n     *  'onClick': function() { alert('clicked ' + this.label); }\n     * };\n     *\n     * _.bindAll(view);\n     * jQuery('#docs').on('click', view.onClick);\n     * // => alerts 'clicked docs', when the button is clicked\n     */\n    function bindAll(object) {\n      var funcs = arguments.length > 1 ? concat.apply(arrayRef, nativeSlice.call(arguments, 1)) : functions(object),\n          index = -1,\n          length = funcs.length;\n\n      while (++index < length) {\n        var key = funcs[index];\n        object[key] = bind(object[key], object);\n      }\n      return object;\n    }\n\n    /**\n     * Creates a function that, when called, invokes the method at `object[key]`\n     * and prepends any additional `bindKey` arguments to those passed to the bound\n     * function. This method differs from `_.bind` by allowing bound functions to\n     * reference methods that will be redefined or don't yet exist.\n     * See http://michaux.ca/articles/lazy-function-definition-pattern.\n     *\n     * @static\n     * @memberOf _\n     * @category Functions\n     * @param {Object} object The object the method belongs to.\n     * @param {String} key The key of the method.\n     * @param {Mixed} [arg1, arg2, ...] Arguments to be partially applied.\n     * @returns {Function} Returns the new bound function.\n     * @example\n     *\n     * var object = {\n     *   'name': 'moe',\n     *   'greet': function(greeting) {\n     *     return greeting + ' ' + this.name;\n     *   }\n     * };\n     *\n     * var func = _.bindKey(object, 'greet', 'hi');\n     * func();\n     * // => 'hi moe'\n     *\n     * object.greet = function(greeting) {\n     *   return greeting + ', ' + this.name + '!';\n     * };\n     *\n     * func();\n     * // => 'hi, moe!'\n     */\n    function bindKey(object, key) {\n      return createBound(object, key, nativeSlice.call(arguments, 2), indicatorObject);\n    }\n\n    /**\n     * Creates a function that is the composition of the passed functions,\n     * where each function consumes the return value of the function that follows.\n     * For example, composing the functions `f()`, `g()`, and `h()` produces `f(g(h()))`.\n     * Each function is executed with the `this` binding of the composed function.\n     *\n     * @static\n     * @memberOf _\n     * @category Functions\n     * @param {Function} [func1, func2, ...] Functions to compose.\n     * @returns {Function} Returns the new composed function.\n     * @example\n     *\n     * var greet = function(name) { return 'hi ' + name; };\n     * var exclaim = function(statement) { return statement + '!'; };\n     * var welcome = _.compose(exclaim, greet);\n     * welcome('moe');\n     * // => 'hi moe!'\n     */\n    function compose() {\n      var funcs = arguments;\n      return function() {\n        var args = arguments,\n            length = funcs.length;\n\n        while (length--) {\n          args = [funcs[length].apply(this, args)];\n        }\n        return args[0];\n      };\n    }\n\n    /**\n     * Produces a callback bound to an optional `thisArg`. If `func` is a property\n     * name, the created callback will return the property value for a given element.\n     * If `func` is an object, the created callback will return `true` for elements\n     * that contain the equivalent object properties, otherwise it will return `false`.\n     *\n     * Note: All Lo-Dash methods, that accept a `callback` argument, use `_.createCallback`.\n     *\n     * @static\n     * @memberOf _\n     * @category Functions\n     * @param {Mixed} [func=identity] The value to convert to a callback.\n     * @param {Mixed} [thisArg] The `this` binding of the created callback.\n     * @param {Number} [argCount=3] The number of arguments the callback accepts.\n     * @returns {Function} Returns a callback function.\n     * @example\n     *\n     * var stooges = [\n     *   { 'name': 'moe', 'age': 40 },\n     *   { 'name': 'larry', 'age': 50 }\n     * ];\n     *\n     * // wrap to create custom callback shorthands\n     * _.createCallback = _.wrap(_.createCallback, function(func, callback, thisArg) {\n     *   var match = /^(.+?)__([gl]t)(.+)$/.exec(callback);\n     *   return !match ? func(callback, thisArg) : function(object) {\n     *     return match[2] == 'gt' ? object[match[1]] > match[3] : object[match[1]] < match[3];\n     *   };\n     * });\n     *\n     * _.filter(stooges, 'age__gt45');\n     * // => [{ 'name': 'larry', 'age': 50 }]\n     *\n     * // create mixins with support for \"_.pluck\" and \"_.where\" callback shorthands\n     * _.mixin({\n     *   'toLookup': function(collection, callback, thisArg) {\n     *     callback = _.createCallback(callback, thisArg);\n     *     return _.reduce(collection, function(result, value, index, collection) {\n     *       return (result[callback(value, index, collection)] = value, result);\n     *     }, {});\n     *   }\n     * });\n     *\n     * _.toLookup(stooges, 'name');\n     * // => { 'moe': { 'name': 'moe', 'age': 40 }, 'larry': { 'name': 'larry', 'age': 50 } }\n     */\n    function createCallback(func, thisArg, argCount) {\n      if (func == null) {\n        return identity;\n      }\n      var type = typeof func;\n      if (type != 'function') {\n        if (type != 'object') {\n          return function(object) {\n            return object[func];\n          };\n        }\n        var props = keys(func);\n        return function(object) {\n          var length = props.length,\n              result = false;\n          while (length--) {\n            if (!(result = isEqual(object[props[length]], func[props[length]], indicatorObject))) {\n              break;\n            }\n          }\n          return result;\n        };\n      }\n      if (typeof thisArg == 'undefined' || (reThis && !reThis.test(fnToString.call(func)))) {\n        return func;\n      }\n      if (argCount === 1) {\n        return function(value) {\n          return func.call(thisArg, value);\n        };\n      }\n      if (argCount === 2) {\n        return function(a, b) {\n          return func.call(thisArg, a, b);\n        };\n      }\n      if (argCount === 4) {\n        return function(accumulator, value, index, collection) {\n          return func.call(thisArg, accumulator, value, index, collection);\n        };\n      }\n      return function(value, index, collection) {\n        return func.call(thisArg, value, index, collection);\n      };\n    }\n\n    /**\n     * Creates a function that will delay the execution of `func` until after\n     * `wait` milliseconds have elapsed since the last time it was invoked. Pass\n     * an `options` object to indicate that `func` should be invoked on the leading\n     * and/or trailing edge of the `wait` timeout. Subsequent calls to the debounced\n     * function will return the result of the last `func` call.\n     *\n     * Note: If `leading` and `trailing` options are `true`, `func` will be called\n     * on the trailing edge of the timeout only if the the debounced function is\n     * invoked more than once during the `wait` timeout.\n     *\n     * @static\n     * @memberOf _\n     * @category Functions\n     * @param {Function} func The function to debounce.\n     * @param {Number} wait The number of milliseconds to delay.\n     * @param {Object} options The options object.\n     *  [leading=false] A boolean to specify execution on the leading edge of the timeout.\n     *  [maxWait] The maximum time `func` is allowed to be delayed before it's called.\n     *  [trailing=true] A boolean to specify execution on the trailing edge of the timeout.\n     * @returns {Function} Returns the new debounced function.\n     * @example\n     *\n     * var lazyLayout = _.debounce(calculateLayout, 300);\n     * jQuery(window).on('resize', lazyLayout);\n     *\n     * jQuery('#postbox').on('click', _.debounce(sendMail, 200, {\n     *   'leading': true,\n     *   'trailing': false\n     * });\n     */\n    function debounce(func, wait, options) {\n      var args,\n          result,\n          thisArg,\n          callCount = 0,\n          lastCalled = 0,\n          maxWait = false,\n          maxTimeoutId = null,\n          timeoutId = null,\n          trailing = true;\n\n      function clear() {\n        clearTimeout(maxTimeoutId);\n        clearTimeout(timeoutId);\n        callCount = 0;\n        maxTimeoutId = timeoutId = null;\n      }\n\n      function delayed() {\n        var isCalled = trailing && (!leading || callCount > 1);\n        clear();\n        if (isCalled) {\n          if (maxWait !== false) {\n            lastCalled = new Date;\n          }\n          result = func.apply(thisArg, args);\n        }\n      }\n\n      function maxDelayed() {\n        clear();\n        if (trailing || (maxWait !== wait)) {\n          lastCalled = new Date;\n          result = func.apply(thisArg, args);\n        }\n      }\n\n      wait = nativeMax(0, wait || 0);\n      if (options === true) {\n        var leading = true;\n        trailing = false;\n      } else if (isObject(options)) {\n        leading = options.leading;\n        maxWait = 'maxWait' in options && nativeMax(wait, options.maxWait || 0);\n        trailing = 'trailing' in options ? options.trailing : trailing;\n      }\n      return function() {\n        args = arguments;\n        thisArg = this;\n        callCount++;\n\n        // avoid issues with Titanium and `undefined` timeout ids\n        // https://github.com/appcelerator/titanium_mobile/blob/3_1_0_GA/android/titanium/src/java/ti/modules/titanium/TitaniumModule.java#L185-L192\n        clearTimeout(timeoutId);\n\n        if (maxWait === false) {\n          if (leading && callCount < 2) {\n            result = func.apply(thisArg, args);\n          }\n        } else {\n          var now = new Date;\n          if (!maxTimeoutId && !leading) {\n            lastCalled = now;\n          }\n          var remaining = maxWait - (now - lastCalled);\n          if (remaining <= 0) {\n            clearTimeout(maxTimeoutId);\n            maxTimeoutId = null;\n            lastCalled = now;\n            result = func.apply(thisArg, args);\n          }\n          else if (!maxTimeoutId) {\n            maxTimeoutId = setTimeout(maxDelayed, remaining);\n          }\n        }\n        if (wait !== maxWait) {\n          timeoutId = setTimeout(delayed, wait);\n        }\n        return result;\n      };\n    }\n\n    /**\n     * Defers executing the `func` function until the current call stack has cleared.\n     * Additional arguments will be passed to `func` when it is invoked.\n     *\n     * @static\n     * @memberOf _\n     * @category Functions\n     * @param {Function} func The function to defer.\n     * @param {Mixed} [arg1, arg2, ...] Arguments to invoke the function with.\n     * @returns {Number} Returns the timer id.\n     * @example\n     *\n     * _.defer(function() { alert('deferred'); });\n     * // returns from the function before `alert` is called\n     */\n    function defer(func) {\n      var args = nativeSlice.call(arguments, 1);\n      return setTimeout(function() { func.apply(undefined, args); }, 1);\n    }\n    // use `setImmediate` if it's available in Node.js\n    if (isV8 && freeModule && typeof setImmediate == 'function') {\n      defer = bind(setImmediate, context);\n    }\n\n    /**\n     * Executes the `func` function after `wait` milliseconds. Additional arguments\n     * will be passed to `func` when it is invoked.\n     *\n     * @static\n     * @memberOf _\n     * @category Functions\n     * @param {Function} func The function to delay.\n     * @param {Number} wait The number of milliseconds to delay execution.\n     * @param {Mixed} [arg1, arg2, ...] Arguments to invoke the function with.\n     * @returns {Number} Returns the timer id.\n     * @example\n     *\n     * var log = _.bind(console.log, console);\n     * _.delay(log, 1000, 'logged later');\n     * // => 'logged later' (Appears after one second.)\n     */\n    function delay(func, wait) {\n      var args = nativeSlice.call(arguments, 2);\n      return setTimeout(function() { func.apply(undefined, args); }, wait);\n    }\n\n    /**\n     * Creates a function that memoizes the result of `func`. If `resolver` is\n     * passed, it will be used to determine the cache key for storing the result\n     * based on the arguments passed to the memoized function. By default, the first\n     * argument passed to the memoized function is used as the cache key. The `func`\n     * is executed with the `this` binding of the memoized function. The result\n     * cache is exposed as the `cache` property on the memoized function.\n     *\n     * @static\n     * @memberOf _\n     * @category Functions\n     * @param {Function} func The function to have its output memoized.\n     * @param {Function} [resolver] A function used to resolve the cache key.\n     * @returns {Function} Returns the new memoizing function.\n     * @example\n     *\n     * var fibonacci = _.memoize(function(n) {\n     *   return n < 2 ? n : fibonacci(n - 1) + fibonacci(n - 2);\n     * });\n     */\n    function memoize(func, resolver) {\n      function memoized() {\n        var cache = memoized.cache,\n            key = keyPrefix + (resolver ? resolver.apply(this, arguments) : arguments[0]);\n\n        return hasOwnProperty.call(cache, key)\n          ? cache[key]\n          : (cache[key] = func.apply(this, arguments));\n      }\n      memoized.cache = {};\n      return memoized;\n    }\n\n    /**\n     * Creates a function that is restricted to execute `func` once. Repeat calls to\n     * the function will return the value of the first call. The `func` is executed\n     * with the `this` binding of the created function.\n     *\n     * @static\n     * @memberOf _\n     * @category Functions\n     * @param {Function} func The function to restrict.\n     * @returns {Function} Returns the new restricted function.\n     * @example\n     *\n     * var initialize = _.once(createApplication);\n     * initialize();\n     * initialize();\n     * // `initialize` executes `createApplication` once\n     */\n    function once(func) {\n      var ran,\n          result;\n\n      return function() {\n        if (ran) {\n          return result;\n        }\n        ran = true;\n        result = func.apply(this, arguments);\n\n        // clear the `func` variable so the function may be garbage collected\n        func = null;\n        return result;\n      };\n    }\n\n    /**\n     * Creates a function that, when called, invokes `func` with any additional\n     * `partial` arguments prepended to those passed to the new function. This\n     * method is similar to `_.bind`, except it does **not** alter the `this` binding.\n     *\n     * @static\n     * @memberOf _\n     * @category Functions\n     * @param {Function} func The function to partially apply arguments to.\n     * @param {Mixed} [arg1, arg2, ...] Arguments to be partially applied.\n     * @returns {Function} Returns the new partially applied function.\n     * @example\n     *\n     * var greet = function(greeting, name) { return greeting + ' ' + name; };\n     * var hi = _.partial(greet, 'hi');\n     * hi('moe');\n     * // => 'hi moe'\n     */\n    function partial(func) {\n      return createBound(func, nativeSlice.call(arguments, 1));\n    }\n\n    /**\n     * This method is similar to `_.partial`, except that `partial` arguments are\n     * appended to those passed to the new function.\n     *\n     * @static\n     * @memberOf _\n     * @category Functions\n     * @param {Function} func The function to partially apply arguments to.\n     * @param {Mixed} [arg1, arg2, ...] Arguments to be partially applied.\n     * @returns {Function} Returns the new partially applied function.\n     * @example\n     *\n     * var defaultsDeep = _.partialRight(_.merge, _.defaults);\n     *\n     * var options = {\n     *   'variable': 'data',\n     *   'imports': { 'jq': $ }\n     * };\n     *\n     * defaultsDeep(options, _.templateSettings);\n     *\n     * options.variable\n     * // => 'data'\n     *\n     * options.imports\n     * // => { '_': _, 'jq': $ }\n     */\n    function partialRight(func) {\n      return createBound(func, nativeSlice.call(arguments, 1), null, indicatorObject);\n    }\n\n    /**\n     * Creates a function that, when executed, will only call the `func` function\n     * at most once per every `wait` milliseconds. Pass an `options` object to\n     * indicate that `func` should be invoked on the leading and/or trailing edge\n     * of the `wait` timeout. Subsequent calls to the throttled function will\n     * return the result of the last `func` call.\n     *\n     * Note: If `leading` and `trailing` options are `true`, `func` will be called\n     * on the trailing edge of the timeout only if the the throttled function is\n     * invoked more than once during the `wait` timeout.\n     *\n     * @static\n     * @memberOf _\n     * @category Functions\n     * @param {Function} func The function to throttle.\n     * @param {Number} wait The number of milliseconds to throttle executions to.\n     * @param {Object} options The options object.\n     *  [leading=true] A boolean to specify execution on the leading edge of the timeout.\n     *  [trailing=true] A boolean to specify execution on the trailing edge of the timeout.\n     * @returns {Function} Returns the new throttled function.\n     * @example\n     *\n     * var throttled = _.throttle(updatePosition, 100);\n     * jQuery(window).on('scroll', throttled);\n     *\n     * jQuery('.interactive').on('click', _.throttle(renewToken, 300000, {\n     *   'trailing': false\n     * }));\n     */\n    function throttle(func, wait, options) {\n      var leading = true,\n          trailing = true;\n\n      if (options === false) {\n        leading = false;\n      } else if (isObject(options)) {\n        leading = 'leading' in options ? options.leading : leading;\n        trailing = 'trailing' in options ? options.trailing : trailing;\n      }\n      options = getObject();\n      options.leading = leading;\n      options.maxWait = wait;\n      options.trailing = trailing;\n\n      var result = debounce(func, wait, options);\n      releaseObject(options);\n      return result;\n    }\n\n    /**\n     * Creates a function that passes `value` to the `wrapper` function as its\n     * first argument. Additional arguments passed to the function are appended\n     * to those passed to the `wrapper` function. The `wrapper` is executed with\n     * the `this` binding of the created function.\n     *\n     * @static\n     * @memberOf _\n     * @category Functions\n     * @param {Mixed} value The value to wrap.\n     * @param {Function} wrapper The wrapper function.\n     * @returns {Function} Returns the new function.\n     * @example\n     *\n     * var hello = function(name) { return 'hello ' + name; };\n     * hello = _.wrap(hello, function(func) {\n     *   return 'before, ' + func('moe') + ', after';\n     * });\n     * hello();\n     * // => 'before, hello moe, after'\n     */\n    function wrap(value, wrapper) {\n      return function() {\n        var args = [value];\n        push.apply(args, arguments);\n        return wrapper.apply(this, args);\n      };\n    }\n\n    /*--------------------------------------------------------------------------*/\n\n    /**\n     * Converts the characters `&`, `<`, `>`, `\"`, and `'` in `string` to their\n     * corresponding HTML entities.\n     *\n     * @static\n     * @memberOf _\n     * @category Utilities\n     * @param {String} string The string to escape.\n     * @returns {String} Returns the escaped string.\n     * @example\n     *\n     * _.escape('Moe, Larry & Curly');\n     * // => 'Moe, Larry &amp; Curly'\n     */\n    function escape(string) {\n      return string == null ? '' : String(string).replace(reUnescapedHtml, escapeHtmlChar);\n    }\n\n    /**\n     * This method returns the first argument passed to it.\n     *\n     * @static\n     * @memberOf _\n     * @category Utilities\n     * @param {Mixed} value Any value.\n     * @returns {Mixed} Returns `value`.\n     * @example\n     *\n     * var moe = { 'name': 'moe' };\n     * moe === _.identity(moe);\n     * // => true\n     */\n    function identity(value) {\n      return value;\n    }\n\n    /**\n     * Adds functions properties of `object` to the `lodash` function and chainable\n     * wrapper.\n     *\n     * @static\n     * @memberOf _\n     * @category Utilities\n     * @param {Object} object The object of function properties to add to `lodash`.\n     * @example\n     *\n     * _.mixin({\n     *   'capitalize': function(string) {\n     *     return string.charAt(0).toUpperCase() + string.slice(1).toLowerCase();\n     *   }\n     * });\n     *\n     * _.capitalize('moe');\n     * // => 'Moe'\n     *\n     * _('moe').capitalize();\n     * // => 'Moe'\n     */\n    function mixin(object) {\n      forEach(functions(object), function(methodName) {\n        var func = lodash[methodName] = object[methodName];\n\n        lodash.prototype[methodName] = function() {\n          var value = this.__wrapped__,\n              args = [value];\n\n          push.apply(args, arguments);\n          var result = func.apply(lodash, args);\n          return (value && typeof value == 'object' && value === result)\n            ? this\n            : new lodashWrapper(result);\n        };\n      });\n    }\n\n    /**\n     * Reverts the '_' variable to its previous value and returns a reference to\n     * the `lodash` function.\n     *\n     * @static\n     * @memberOf _\n     * @category Utilities\n     * @returns {Function} Returns the `lodash` function.\n     * @example\n     *\n     * var lodash = _.noConflict();\n     */\n    function noConflict() {\n      context._ = oldDash;\n      return this;\n    }\n\n    /**\n     * Converts the given `value` into an integer of the specified `radix`.\n     * If `radix` is `undefined` or `0`, a `radix` of `10` is used unless the\n     * `value` is a hexadecimal, in which case a `radix` of `16` is used.\n     *\n     * Note: This method avoids differences in native ES3 and ES5 `parseInt`\n     * implementations. See http://es5.github.com/#E.\n     *\n     * @static\n     * @memberOf _\n     * @category Utilities\n     * @param {String} value The value to parse.\n     * @param {Number} [radix] The radix used to interpret the value to parse.\n     * @returns {Number} Returns the new integer value.\n     * @example\n     *\n     * _.parseInt('08');\n     * // => 8\n     */\n    var parseInt = nativeParseInt(whitespace + '08') == 8 ? nativeParseInt : function(value, radix) {\n      // Firefox and Opera still follow the ES3 specified implementation of `parseInt`\n      return nativeParseInt(isString(value) ? value.replace(reLeadingSpacesAndZeros, '') : value, radix || 0);\n    };\n\n    /**\n     * Produces a random number between `min` and `max` (inclusive). If only one\n     * argument is passed, a number between `0` and the given number will be returned.\n     *\n     * @static\n     * @memberOf _\n     * @category Utilities\n     * @param {Number} [min=0] The minimum possible value.\n     * @param {Number} [max=1] The maximum possible value.\n     * @returns {Number} Returns a random number.\n     * @example\n     *\n     * _.random(0, 5);\n     * // => a number between 0 and 5\n     *\n     * _.random(5);\n     * // => also a number between 0 and 5\n     */\n    function random(min, max) {\n      if (min == null && max == null) {\n        max = 1;\n      }\n      min = +min || 0;\n      if (max == null) {\n        max = min;\n        min = 0;\n      } else {\n        max = +max || 0;\n      }\n      var rand = nativeRandom();\n      return (min % 1 || max % 1)\n        ? min + nativeMin(rand * (max - min + parseFloat('1e-' + ((rand +'').length - 1))), max)\n        : min + floor(rand * (max - min + 1));\n    }\n\n    /**\n     * Resolves the value of `property` on `object`. If `property` is a function,\n     * it will be invoked with the `this` binding of `object` and its result returned,\n     * else the property value is returned. If `object` is falsey, then `undefined`\n     * is returned.\n     *\n     * @static\n     * @memberOf _\n     * @category Utilities\n     * @param {Object} object The object to inspect.\n     * @param {String} property The property to get the value of.\n     * @returns {Mixed} Returns the resolved value.\n     * @example\n     *\n     * var object = {\n     *   'cheese': 'crumpets',\n     *   'stuff': function() {\n     *     return 'nonsense';\n     *   }\n     * };\n     *\n     * _.result(object, 'cheese');\n     * // => 'crumpets'\n     *\n     * _.result(object, 'stuff');\n     * // => 'nonsense'\n     */\n    function result(object, property) {\n      var value = object ? object[property] : undefined;\n      return isFunction(value) ? object[property]() : value;\n    }\n\n    /**\n     * A micro-templating method that handles arbitrary delimiters, preserves\n     * whitespace, and correctly escapes quotes within interpolated code.\n     *\n     * Note: In the development build, `_.template` utilizes sourceURLs for easier\n     * debugging. See http://www.html5rocks.com/en/tutorials/developertools/sourcemaps/#toc-sourceurl\n     *\n     * For more information on precompiling templates see:\n     * http://lodash.com/#custom-builds\n     *\n     * For more information on Chrome extension sandboxes see:\n     * http://developer.chrome.com/stable/extensions/sandboxingEval.html\n     *\n     * @static\n     * @memberOf _\n     * @category Utilities\n     * @param {String} text The template text.\n     * @param {Object} data The data object used to populate the text.\n     * @param {Object} options The options object.\n     *  escape - The \"escape\" delimiter regexp.\n     *  evaluate - The \"evaluate\" delimiter regexp.\n     *  interpolate - The \"interpolate\" delimiter regexp.\n     *  sourceURL - The sourceURL of the template's compiled source.\n     *  variable - The data object variable name.\n     * @returns {Function|String} Returns a compiled function when no `data` object\n     *  is given, else it returns the interpolated text.\n     * @example\n     *\n     * // using a compiled template\n     * var compiled = _.template('hello <%= name %>');\n     * compiled({ 'name': 'moe' });\n     * // => 'hello moe'\n     *\n     * var list = '<% _.forEach(people, function(name) { %><li><%= name %></li><% }); %>';\n     * _.template(list, { 'people': ['moe', 'larry'] });\n     * // => '<li>moe</li><li>larry</li>'\n     *\n     * // using the \"escape\" delimiter to escape HTML in data property values\n     * _.template('<b><%- value %></b>', { 'value': '<script>' });\n     * // => '<b>&lt;script&gt;</b>'\n     *\n     * // using the ES6 delimiter as an alternative to the default \"interpolate\" delimiter\n     * _.template('hello ${ name }', { 'name': 'curly' });\n     * // => 'hello curly'\n     *\n     * // using the internal `print` function in \"evaluate\" delimiters\n     * _.template('<% print(\"hello \" + epithet); %>!', { 'epithet': 'stooge' });\n     * // => 'hello stooge!'\n     *\n     * // using custom template delimiters\n     * _.templateSettings = {\n     *   'interpolate': /{{([\\s\\S]+?)}}/g\n     * };\n     *\n     * _.template('hello {{ name }}!', { 'name': 'mustache' });\n     * // => 'hello mustache!'\n     *\n     * // using the `sourceURL` option to specify a custom sourceURL for the template\n     * var compiled = _.template('hello <%= name %>', null, { 'sourceURL': '/basic/greeting.jst' });\n     * compiled(data);\n     * // => find the source of \"greeting.jst\" under the Sources tab or Resources panel of the web inspector\n     *\n     * // using the `variable` option to ensure a with-statement isn't used in the compiled template\n     * var compiled = _.template('hi <%= data.name %>!', null, { 'variable': 'data' });\n     * compiled.source;\n     * // => function(data) {\n     *   var __t, __p = '', __e = _.escape;\n     *   __p += 'hi ' + ((__t = ( data.name )) == null ? '' : __t) + '!';\n     *   return __p;\n     * }\n     *\n     * // using the `source` property to inline compiled templates for meaningful\n     * // line numbers in error messages and a stack trace\n     * fs.writeFileSync(path.join(cwd, 'jst.js'), '\\\n     *   var JST = {\\\n     *     \"main\": ' + _.template(mainText).source + '\\\n     *   };\\\n     * ');\n     */\n    function template(text, data, options) {\n      // based on John Resig's `tmpl` implementation\n      // http://ejohn.org/blog/javascript-micro-templating/\n      // and Laura Doktorova's doT.js\n      // https://github.com/olado/doT\n      var settings = lodash.templateSettings;\n      text || (text = '');\n\n      // avoid missing dependencies when `iteratorTemplate` is not defined\n      options = defaults({}, options, settings);\n\n      var imports = defaults({}, options.imports, settings.imports),\n          importsKeys = keys(imports),\n          importsValues = values(imports);\n\n      var isEvaluating,\n          index = 0,\n          interpolate = options.interpolate || reNoMatch,\n          source = \"__p += '\";\n\n      // compile the regexp to match each delimiter\n      var reDelimiters = RegExp(\n        (options.escape || reNoMatch).source + '|' +\n        interpolate.source + '|' +\n        (interpolate === reInterpolate ? reEsTemplate : reNoMatch).source + '|' +\n        (options.evaluate || reNoMatch).source + '|$'\n      , 'g');\n\n      text.replace(reDelimiters, function(match, escapeValue, interpolateValue, esTemplateValue, evaluateValue, offset) {\n        interpolateValue || (interpolateValue = esTemplateValue);\n\n        // escape characters that cannot be included in string literals\n        source += text.slice(index, offset).replace(reUnescapedString, escapeStringChar);\n\n        // replace delimiters with snippets\n        if (escapeValue) {\n          source += \"' +\\n__e(\" + escapeValue + \") +\\n'\";\n        }\n        if (evaluateValue) {\n          isEvaluating = true;\n          source += \"';\\n\" + evaluateValue + \";\\n__p += '\";\n        }\n        if (interpolateValue) {\n          source += \"' +\\n((__t = (\" + interpolateValue + \")) == null ? '' : __t) +\\n'\";\n        }\n        index = offset + match.length;\n\n        // the JS engine embedded in Adobe products requires returning the `match`\n        // string in order to produce the correct `offset` value\n        return match;\n      });\n\n      source += \"';\\n\";\n\n      // if `variable` is not specified, wrap a with-statement around the generated\n      // code to add the data object to the top of the scope chain\n      var variable = options.variable,\n          hasVariable = variable;\n\n      if (!hasVariable) {\n        variable = 'obj';\n        source = 'with (' + variable + ') {\\n' + source + '\\n}\\n';\n      }\n      // cleanup code by stripping empty strings\n      source = (isEvaluating ? source.replace(reEmptyStringLeading, '') : source)\n        .replace(reEmptyStringMiddle, '$1')\n        .replace(reEmptyStringTrailing, '$1;');\n\n      // frame code as the function body\n      source = 'function(' + variable + ') {\\n' +\n        (hasVariable ? '' : variable + ' || (' + variable + ' = {});\\n') +\n        \"var __t, __p = '', __e = _.escape\" +\n        (isEvaluating\n          ? ', __j = Array.prototype.join;\\n' +\n            \"function print() { __p += __j.call(arguments, '') }\\n\"\n          : ';\\n'\n        ) +\n        source +\n        'return __p\\n}';\n\n      // Use a sourceURL for easier debugging and wrap in a multi-line comment to\n      // avoid issues with Narwhal, IE conditional compilation, and the JS engine\n      // embedded in Adobe products.\n      // http://www.html5rocks.com/en/tutorials/developertools/sourcemaps/#toc-sourceurl\n      var sourceURL = '\\n/*\\n//@ sourceURL=' + (options.sourceURL || '/lodash/template/source[' + (templateCounter++) + ']') + '\\n*/';\n\n      try {\n        var result = Function(importsKeys, 'return ' + source + sourceURL).apply(undefined, importsValues);\n      } catch(e) {\n        e.source = source;\n        throw e;\n      }\n      if (data) {\n        return result(data);\n      }\n      // provide the compiled function's source via its `toString` method, in\n      // supported environments, or the `source` property as a convenience for\n      // inlining compiled templates during the build process\n      result.source = source;\n      return result;\n    }\n\n    /**\n     * Executes the `callback` function `n` times, returning an array of the results\n     * of each `callback` execution. The `callback` is bound to `thisArg` and invoked\n     * with one argument; (index).\n     *\n     * @static\n     * @memberOf _\n     * @category Utilities\n     * @param {Number} n The number of times to execute the callback.\n     * @param {Function} callback The function called per iteration.\n     * @param {Mixed} [thisArg] The `this` binding of `callback`.\n     * @returns {Array} Returns a new array of the results of each `callback` execution.\n     * @example\n     *\n     * var diceRolls = _.times(3, _.partial(_.random, 1, 6));\n     * // => [3, 6, 4]\n     *\n     * _.times(3, function(n) { mage.castSpell(n); });\n     * // => calls `mage.castSpell(n)` three times, passing `n` of `0`, `1`, and `2` respectively\n     *\n     * _.times(3, function(n) { this.cast(n); }, mage);\n     * // => also calls `mage.castSpell(n)` three times\n     */\n    function times(n, callback, thisArg) {\n      n = (n = +n) > -1 ? n : 0;\n      var index = -1,\n          result = Array(n);\n\n      callback = lodash.createCallback(callback, thisArg, 1);\n      while (++index < n) {\n        result[index] = callback(index);\n      }\n      return result;\n    }\n\n    /**\n     * The inverse of `_.escape`, this method converts the HTML entities\n     * `&amp;`, `&lt;`, `&gt;`, `&quot;`, and `&#39;` in `string` to their\n     * corresponding characters.\n     *\n     * @static\n     * @memberOf _\n     * @category Utilities\n     * @param {String} string The string to unescape.\n     * @returns {String} Returns the unescaped string.\n     * @example\n     *\n     * _.unescape('Moe, Larry &amp; Curly');\n     * // => 'Moe, Larry & Curly'\n     */\n    function unescape(string) {\n      return string == null ? '' : String(string).replace(reEscapedHtml, unescapeHtmlChar);\n    }\n\n    /**\n     * Generates a unique ID. If `prefix` is passed, the ID will be appended to it.\n     *\n     * @static\n     * @memberOf _\n     * @category Utilities\n     * @param {String} [prefix] The value to prefix the ID with.\n     * @returns {String} Returns the unique ID.\n     * @example\n     *\n     * _.uniqueId('contact_');\n     * // => 'contact_104'\n     *\n     * _.uniqueId();\n     * // => '105'\n     */\n    function uniqueId(prefix) {\n      var id = ++idCounter;\n      return String(prefix == null ? '' : prefix) + id;\n    }\n\n    /*--------------------------------------------------------------------------*/\n\n    /**\n     * Invokes `interceptor` with the `value` as the first argument, and then\n     * returns `value`. The purpose of this method is to \"tap into\" a method chain,\n     * in order to perform operations on intermediate results within the chain.\n     *\n     * @static\n     * @memberOf _\n     * @category Chaining\n     * @param {Mixed} value The value to pass to `interceptor`.\n     * @param {Function} interceptor The function to invoke.\n     * @returns {Mixed} Returns `value`.\n     * @example\n     *\n     * _([1, 2, 3, 4])\n     *  .filter(function(num) { return num % 2 == 0; })\n     *  .tap(alert)\n     *  .map(function(num) { return num * num; })\n     *  .value();\n     * // => // [2, 4] (alerted)\n     * // => [4, 16]\n     */\n    function tap(value, interceptor) {\n      interceptor(value);\n      return value;\n    }\n\n    /**\n     * Produces the `toString` result of the wrapped value.\n     *\n     * @name toString\n     * @memberOf _\n     * @category Chaining\n     * @returns {String} Returns the string result.\n     * @example\n     *\n     * _([1, 2, 3]).toString();\n     * // => '1,2,3'\n     */\n    function wrapperToString() {\n      return String(this.__wrapped__);\n    }\n\n    /**\n     * Extracts the wrapped value.\n     *\n     * @name valueOf\n     * @memberOf _\n     * @alias value\n     * @category Chaining\n     * @returns {Mixed} Returns the wrapped value.\n     * @example\n     *\n     * _([1, 2, 3]).valueOf();\n     * // => [1, 2, 3]\n     */\n    function wrapperValueOf() {\n      return this.__wrapped__;\n    }\n\n    /*--------------------------------------------------------------------------*/\n\n    // add functions that return wrapped values when chaining\n    lodash.after = after;\n    lodash.assign = assign;\n    lodash.at = at;\n    lodash.bind = bind;\n    lodash.bindAll = bindAll;\n    lodash.bindKey = bindKey;\n    lodash.compact = compact;\n    lodash.compose = compose;\n    lodash.countBy = countBy;\n    lodash.createCallback = createCallback;\n    lodash.debounce = debounce;\n    lodash.defaults = defaults;\n    lodash.defer = defer;\n    lodash.delay = delay;\n    lodash.difference = difference;\n    lodash.filter = filter;\n    lodash.flatten = flatten;\n    lodash.forEach = forEach;\n    lodash.forIn = forIn;\n    lodash.forOwn = forOwn;\n    lodash.functions = functions;\n    lodash.groupBy = groupBy;\n    lodash.initial = initial;\n    lodash.intersection = intersection;\n    lodash.invert = invert;\n    lodash.invoke = invoke;\n    lodash.keys = keys;\n    lodash.map = map;\n    lodash.max = max;\n    lodash.memoize = memoize;\n    lodash.merge = merge;\n    lodash.min = min;\n    lodash.omit = omit;\n    lodash.once = once;\n    lodash.pairs = pairs;\n    lodash.partial = partial;\n    lodash.partialRight = partialRight;\n    lodash.pick = pick;\n    lodash.pluck = pluck;\n    lodash.range = range;\n    lodash.reject = reject;\n    lodash.rest = rest;\n    lodash.shuffle = shuffle;\n    lodash.sortBy = sortBy;\n    lodash.tap = tap;\n    lodash.throttle = throttle;\n    lodash.times = times;\n    lodash.toArray = toArray;\n    lodash.transform = transform;\n    lodash.union = union;\n    lodash.uniq = uniq;\n    lodash.unzip = unzip;\n    lodash.values = values;\n    lodash.where = where;\n    lodash.without = without;\n    lodash.wrap = wrap;\n    lodash.zip = zip;\n    lodash.zipObject = zipObject;\n\n    // add aliases\n    lodash.collect = map;\n    lodash.drop = rest;\n    lodash.each = forEach;\n    lodash.extend = assign;\n    lodash.methods = functions;\n    lodash.object = zipObject;\n    lodash.select = filter;\n    lodash.tail = rest;\n    lodash.unique = uniq;\n\n    // add functions to `lodash.prototype`\n    mixin(lodash);\n\n    // add Underscore compat\n    lodash.chain = lodash;\n    lodash.prototype.chain = function() { return this; };\n\n    /*--------------------------------------------------------------------------*/\n\n    // add functions that return unwrapped values when chaining\n    lodash.clone = clone;\n    lodash.cloneDeep = cloneDeep;\n    lodash.contains = contains;\n    lodash.escape = escape;\n    lodash.every = every;\n    lodash.find = find;\n    lodash.findIndex = findIndex;\n    lodash.findKey = findKey;\n    lodash.has = has;\n    lodash.identity = identity;\n    lodash.indexOf = indexOf;\n    lodash.isArguments = isArguments;\n    lodash.isArray = isArray;\n    lodash.isBoolean = isBoolean;\n    lodash.isDate = isDate;\n    lodash.isElement = isElement;\n    lodash.isEmpty = isEmpty;\n    lodash.isEqual = isEqual;\n    lodash.isFinite = isFinite;\n    lodash.isFunction = isFunction;\n    lodash.isNaN = isNaN;\n    lodash.isNull = isNull;\n    lodash.isNumber = isNumber;\n    lodash.isObject = isObject;\n    lodash.isPlainObject = isPlainObject;\n    lodash.isRegExp = isRegExp;\n    lodash.isString = isString;\n    lodash.isUndefined = isUndefined;\n    lodash.lastIndexOf = lastIndexOf;\n    lodash.mixin = mixin;\n    lodash.noConflict = noConflict;\n    lodash.parseInt = parseInt;\n    lodash.random = random;\n    lodash.reduce = reduce;\n    lodash.reduceRight = reduceRight;\n    lodash.result = result;\n    lodash.runInContext = runInContext;\n    lodash.size = size;\n    lodash.some = some;\n    lodash.sortedIndex = sortedIndex;\n    lodash.template = template;\n    lodash.unescape = unescape;\n    lodash.uniqueId = uniqueId;\n\n    // add aliases\n    lodash.all = every;\n    lodash.any = some;\n    lodash.detect = find;\n    lodash.findWhere = find;\n    lodash.foldl = reduce;\n    lodash.foldr = reduceRight;\n    lodash.include = contains;\n    lodash.inject = reduce;\n\n    forOwn(lodash, function(func, methodName) {\n      if (!lodash.prototype[methodName]) {\n        lodash.prototype[methodName] = function() {\n          var args = [this.__wrapped__];\n          push.apply(args, arguments);\n          return func.apply(lodash, args);\n        };\n      }\n    });\n\n    /*--------------------------------------------------------------------------*/\n\n    // add functions capable of returning wrapped and unwrapped values when chaining\n    lodash.first = first;\n    lodash.last = last;\n\n    // add aliases\n    lodash.take = first;\n    lodash.head = first;\n\n    forOwn(lodash, function(func, methodName) {\n      if (!lodash.prototype[methodName]) {\n        lodash.prototype[methodName]= function(callback, thisArg) {\n          var result = func(this.__wrapped__, callback, thisArg);\n          return callback == null || (thisArg && typeof callback != 'function')\n            ? result\n            : new lodashWrapper(result);\n        };\n      }\n    });\n\n    /*--------------------------------------------------------------------------*/\n\n    /**\n     * The semantic version number.\n     *\n     * @static\n     * @memberOf _\n     * @type String\n     */\n    lodash.VERSION = '1.3.1';\n\n    // add \"Chaining\" functions to the wrapper\n    lodash.prototype.toString = wrapperToString;\n    lodash.prototype.value = wrapperValueOf;\n    lodash.prototype.valueOf = wrapperValueOf;\n\n    // add `Array` functions that return unwrapped values\n    forEach(['join', 'pop', 'shift'], function(methodName) {\n      var func = arrayRef[methodName];\n      lodash.prototype[methodName] = function() {\n        return func.apply(this.__wrapped__, arguments);\n      };\n    });\n\n    // add `Array` functions that return the wrapped value\n    forEach(['push', 'reverse', 'sort', 'unshift'], function(methodName) {\n      var func = arrayRef[methodName];\n      lodash.prototype[methodName] = function() {\n        func.apply(this.__wrapped__, arguments);\n        return this;\n      };\n    });\n\n    // add `Array` functions that return new wrapped values\n    forEach(['concat', 'slice', 'splice'], function(methodName) {\n      var func = arrayRef[methodName];\n      lodash.prototype[methodName] = function() {\n        return new lodashWrapper(func.apply(this.__wrapped__, arguments));\n      };\n    });\n\n    return lodash;\n  }\n\n  /*--------------------------------------------------------------------------*/\n\n  // expose Lo-Dash\n  var _ = runInContext();\n\n  // some AMD build optimizers, like r.js, check for specific condition patterns like the following:\n  if (typeof define == 'function' && typeof define.amd == 'object' && define.amd) {\n    // Expose Lo-Dash to the global object even when an AMD loader is present in\n    // case Lo-Dash was injected by a third-party script and not intended to be\n    // loaded as a module. The global assignment can be reverted in the Lo-Dash\n    // module via its `noConflict()` method.\n    window._ = _;\n\n    // define as an anonymous module so, through path mapping, it can be\n    // referenced as the \"underscore\" module\n    define(function() {\n      return _;\n    });\n  }\n  // check for `exports` after `define` in case a build optimizer adds an `exports` object\n  else if (freeExports && !freeExports.nodeType) {\n    // in Node.js or RingoJS v0.8.0+\n    if (freeModule) {\n      (freeModule.exports = _)._ = _;\n    }\n    // in Narwhal or RingoJS v0.7.0-\n    else {\n      freeExports._ = _;\n    }\n  }\n  else {\n    // in a browser or Rhino\n    window._ = _;\n  }\n}(this));\n\n})(self)"]} | |
;var und = require('lodash'); | |
var q = [{ name: 'larry', age:34},{name:'moe',age:27}]; | |
document.write(und.pluck(q,"age")); |
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