| 1 |
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| 2 |
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| 3 | /**
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| 4 | * Array.indexOf
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| 5 | */
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| 6 | function indexOf(arr, item, fromIndex) {
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| 7 | fromIndex = fromIndex || 0;
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| 8 | if (arr == null) {
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| 9 | return -1;
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| 10 | }
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| 11 |
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| 12 | var len = arr.length,
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| 13 | i = fromIndex < 0 ? len + fromIndex : fromIndex;
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| 14 | while (i < len) {
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| 15 | // we iterate over sparse items since there is no way to make it
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| 16 | // work properly on IE 7-8. see #64
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| 17 | if (arr[i] === item) {
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| 18 | return i;
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| 19 | }
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| 20 |
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| 21 | i++;
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| 22 | }
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| 23 |
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| 24 | return -1;
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| 25 | }
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| 26 |
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| 27 | module.exports = indexOf;
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| 28 |
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