Last active
August 29, 2015 14:02
-
-
Save takunagai/76595108a85ae4d6883a to your computer and use it in GitHub Desktop.
IE8以前で forEach が使えるようにする
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
/** | |
* forEachをサポートしていないIE8以前で forEach が使えるようにする | |
* | |
* Production steps of ECMA-262, Edition 5, 15.4.4.18 | |
* Reference: http://es5.github.com/#x15.4.4.18 | |
* https://developer.mozilla.org/ja/docs/JavaScript/Reference/Global_Objects/Array/forEach | |
* https://gist.github.com/oreo3/76595108a85ae4d6883a | |
*/ | |
if (!Array.prototype.forEach) { | |
Array.prototype.forEach = function(callback, thisArg) { | |
var T, k; | |
if (this === null) { | |
throw new TypeError("this is null or not defined"); | |
} | |
var O = Object(this); | |
var len = O.length >>> 0; | |
if ({}.toString.call(callback) != "[object Function]") { | |
throw new TypeError(callback + " is not a function"); | |
} | |
if (thisArg) {T = thisArg;} | |
k = 0; | |
while(k < len) { | |
var kValue; | |
if (k in O) { | |
kValue = O[k]; | |
callback.call(T, kValue, k, O); | |
} | |
k++; | |
} | |
}; | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment