lodash.js

var _ = {pick}

function pick (object, identifierStr) {
  var path = identifierStr.split('.')
  if (path.length === 1 ) {
    return object[path[0]]
  }
  var [first, ...rest] = path
  return pick(object[first], rest.join('.'))
}

const flatten = (arr) => arr.reduce((acc, val) => acc.concat(val), [])

function keys (object, path) {
	var object_keys = []
    for (var key of Object.keys(object)) {
      	object_keys = object_keys.concat([`${path}.${key}`]) 
    	if (typeof object[key] === 'object') {
        	object_keys = object_keys.concat(keys(object[key], `${path}.${key}`))
        }
    }
    return object_keys
}

function mixin( sourceObj, targetObj ) {
  for (var key in sourceObj) {
    targetObj[key] = sourceObj[key];
  }
  return targetObj;
}


function isNull (val){
  return !val && typeof val === 'object'
}

// pollyfill for isNaN
if (!Number.isNaN) {
	Number.isNaN = function(n) {
		return (
			typeof n === "number" &&
			window.isNaN( n )
		);
	};
}