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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,63 +1,63 @@ | ||
| // Array.indexOf polyfill for IE8 | ||
| if (!Array.prototype.indexOf) { | ||
| Array.prototype.indexOf = function (searchElement, fromIndex) { | ||
| var k; | ||
|
|
||
| // 1. Let O be the result of calling ToObject passing | ||
| // the this value as the argument. | ||
| if (this == null) { | ||
| throw new TypeError('"this" is null or not defined'); | ||
| } | ||
|
|
||
| var O = Object(this); | ||
|
|
||
| // 2. Let lenValue be the result of calling the Get | ||
| // internal method of O with the argument "length". | ||
| // 3. Let len be ToUint32(lenValue). | ||
| var len = O.length >>> 0; | ||
|
|
||
| // 4. If len is 0, return -1. | ||
| if (len === 0) { | ||
| return -1; | ||
| } | ||
|
|
||
| // 5. If argument fromIndex was passed let n be | ||
| // ToInteger(fromIndex); else let n be 0. | ||
| var n = +fromIndex || 0; | ||
|
|
||
| if (Math.abs(n) === Infinity) { | ||
| n = 0; | ||
| } | ||
|
|
||
| // 6. If n >= len, return -1. | ||
| if (n >= len) { | ||
| return -1; | ||
| } | ||
|
|
||
| // 7. If n >= 0, then Let k be n. | ||
| // 8. Else, n<0, Let k be len - abs(n). | ||
| // If k is less than 0, then let k be 0. | ||
| k = Math.max(n >= 0 ? n : len - Math.abs(n), 0); | ||
|
|
||
| // 9. Repeat, while k < len | ||
| while (k < len) { | ||
| // a. Let Pk be ToString(k). | ||
| // This is implicit for LHS operands of the in operator | ||
| // b. Let kPresent be the result of calling the | ||
| // HasProperty internal method of O with argument Pk. | ||
| // This step can be combined with c | ||
| // c. If kPresent is true, then | ||
| // i. Let elementK be the result of calling the Get | ||
| // internal method of O with the argument ToString(k). | ||
| // ii. Let same be the result of applying the | ||
| // Strict Equality Comparison Algorithm to | ||
| // searchElement and elementK. | ||
| // iii. If same is true, return k. | ||
| if (k in O && O[k] === searchElement) { | ||
| return k; | ||
| } | ||
| k++; | ||
| } | ||
| return -1; | ||
| }; | ||
| Array.prototype.indexOf = function (searchElement, fromIndex) { | ||
| var k; | ||
|
|
||
| // 1. Let O be the result of calling ToObject passing | ||
| // the this value as the argument. | ||
| if (this == null) { | ||
| throw new TypeError('"this" is null or not defined'); | ||
| } | ||
|
|
||
| var O = Object(this); | ||
|
|
||
| // 2. Let lenValue be the result of calling the Get | ||
| // internal method of O with the argument "length". | ||
| // 3. Let len be ToUint32(lenValue). | ||
| var len = O.length >>> 0; | ||
|
|
||
| // 4. If len is 0, return -1. | ||
| if (len === 0) { | ||
| return -1; | ||
| } | ||
|
|
||
| // 5. If argument fromIndex was passed let n be | ||
| // ToInteger(fromIndex); else let n be 0. | ||
| var n = +fromIndex || 0; | ||
|
|
||
| if (Math.abs(n) === Infinity) { | ||
| n = 0; | ||
| } | ||
|
|
||
| // 6. If n >= len, return -1. | ||
| if (n >= len) { | ||
| return -1; | ||
| } | ||
|
|
||
| // 7. If n >= 0, then Let k be n. | ||
| // 8. Else, n<0, Let k be len - abs(n). | ||
| // If k is less than 0, then let k be 0. | ||
| k = Math.max(n >= 0 ? n : len - Math.abs(n), 0); | ||
|
|
||
| // 9. Repeat, while k < len | ||
| while (k < len) { | ||
| // a. Let Pk be ToString(k). | ||
| // This is implicit for LHS operands of the in operator | ||
| // b. Let kPresent be the result of calling the | ||
| // HasProperty internal method of O with argument Pk. | ||
| // This step can be combined with c | ||
| // c. If kPresent is true, then | ||
| // i. Let elementK be the result of calling the Get | ||
| // internal method of O with the argument ToString(k). | ||
| // ii. Let same be the result of applying the | ||
| // Strict Equality Comparison Algorithm to | ||
| // searchElement and elementK. | ||
| // iii. If same is true, return k. | ||
| if (k in O && O[k] === searchElement) { | ||
| return k; | ||
| } | ||
| k++; | ||
| } | ||
| return -1; | ||
| }; | ||
| } |
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