58 lines
1.5 KiB
JavaScript
58 lines
1.5 KiB
JavaScript
Array.prototype.forEach = function(callback, thisArg) {
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var T, k;
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if (this === null) {
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throw new TypeError(' this is null or not defined');
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}
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// 1. Let O be the result of calling toObject() passing the
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// |this| value as the argument.
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var O = Object(this);
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// 2. Let lenValue be the result of calling the Get() internal
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// method of O with the argument "length".
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// 3. Let len be toUint32(lenValue).
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var len = O.length >>> 0;
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// 4. If isCallable(callback) is false, throw a TypeError exception.
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// See: http://es5.github.com/#x9.11
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if (typeof callback !== "function") {
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throw new TypeError(callback + ' is not a function');
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}
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// 5. If thisArg was supplied, let T be thisArg; else let
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// T be undefined.
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if (arguments.length > 1) {
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T = thisArg;
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}
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// 6. Let k be 0
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k = 0;
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// 7. Repeat, while k < len
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while (k < len) {
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var kValue;
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// a. Let Pk be ToString(k).
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// This is implicit for LHS operands of the in operator
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// b. Let kPresent be the result of calling the HasProperty
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// internal method of O with argument Pk.
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// This step can be combined with c
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// c. If kPresent is true, then
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if (k in O) {
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// i. Let kValue be the result of calling the Get internal
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// method of O with argument Pk.
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kValue = O[k];
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// ii. Call the Call internal method of callback with T as
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// the this value and argument list containing kValue, k, and O.
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callback.call(T, kValue, k, O);
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}
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// d. Increase k by 1.
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k++;
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}
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// 8. return undefined
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}; |