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December 16, 2015 12:49
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var strategy = {}; | |
strategy["slice"] = function () { | |
return Array.prototype.slice.call(arguments, 0); | |
}; | |
strategy["cache slice"] = (function () { | |
var slice = Array.prototype.slice; | |
return function () { | |
return slice.call(arguments, 0); | |
}; | |
}()); | |
strategy["bound slice"] = (function () { | |
var slice = Function.call.bind(Array.prototype.slice); | |
return function () { | |
return slice(arguments, 0); | |
}; | |
}()); | |
strategy["for"] = function () { | |
for (var args = [], i = 0, len = arguments.length; i < len; i += 1) { | |
args[i] = arguments[i]; | |
} | |
return args; | |
}; | |
strategy["push"] = function () { | |
var args = []; | |
Array.prototype.push.apply(args, arguments); | |
return args; | |
}; | |
strategy["cache push"] = (function () { | |
var push = Array.prototype.push; | |
return function () { | |
var args = []; | |
push.apply(args, arguments); | |
return args; | |
}; | |
}()); | |
strategy["bound push"] = (function () { | |
var push = Function.apply.bind(Array.prototype.push); | |
return function () { | |
var args = []; | |
push(args, arguments); | |
return args; | |
}; | |
}()); | |
strategy["concat"] = function () { | |
return Array.prototype.concat.apply([], arguments) | |
}; | |
strategy["cache concat"] = (function () { | |
var concat = Array.prototype.concat; | |
return function () { | |
return concat.apply([], arguments); | |
}; | |
}()); | |
strategy["bound concat"] = (function () { | |
var concat = Function.apply.bind(Array.prototype.concat); | |
return function () { | |
return concat([], arguments); | |
}; | |
}()); |
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//http://jsperf.com/arguments-slice1 | |
var strategy = {}; | |
strategy["Array call"] = function () { //winner | |
return Array.call.apply(Array, arguments); | |
}; | |
strategy["slice"] = function () { | |
return Array.prototype.slice.call(arguments, 1); | |
}; | |
strategy["cache slice"] = (function () { | |
var slice = Array.prototype.slice; | |
return function () { | |
return slice.call(arguments, 1); | |
}; | |
}()); | |
strategy["bound slice"] = (function () { | |
var slice = Function.call.bind(Array.prototype.slice); | |
return function () { | |
return slice(arguments, 1); | |
}; | |
}()); | |
strategy["for"] = function () { | |
for (var args = [], i = 1, len = arguments.length; i < len; i += 1) { | |
args[i - 1] = arguments[i]; | |
} | |
return args; | |
}; | |
strategy["while"] = function () { | |
var args = [], i = arguments.length; | |
while (i > 0) { | |
args[i - 2] = arguments[--i]; | |
} | |
return args; | |
}; | |
strategy["reduce"] = function () { | |
return Array.prototype.reduce.call(arguments, function (args, e, i) { | |
return i === 0 ? args : (args[args.length] = e, args); | |
}, []); | |
}; | |
strategy["filter"] = function () { | |
return Array.prototype.filter.call(arguments, function (e, i) { | |
if (i > 0) { | |
return e; | |
} | |
}); | |
}; | |
//test Array.bind.apply(Array, [1,2,3,4,5])() |
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