| 1 | import isArrayLike from './is-array-like';
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| 2 |
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| 3 | const indexOf = function<T> (arr: T[], obj: T): number {
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| 4 | if (!isArrayLike(arr)) {
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| 5 | return -1;
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| 6 | }
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| 7 | const m = Array.prototype.indexOf;
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| 8 | if (m) {
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| 9 | return m.call(arr, obj);
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| 10 | }
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| 11 | let index = -1;
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| 12 |
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| 13 | for (let i = 0; i < arr.length; i++) {
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| 14 | if (arr[i] === obj) {
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| 15 | index = i;
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| 16 | break;
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| 17 | }
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| 18 | }
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| 19 | return index;
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| 20 | };
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| 21 |
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| 22 | export default indexOf;
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