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25 lines
464 B
25 lines
464 B
'use strict'; |
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module.exports = function (arr, predicate, ctx) { |
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if (typeof Array.prototype.findIndex === 'function') { |
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return arr.findIndex(predicate, ctx); |
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} |
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if (typeof predicate !== 'function') { |
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throw new TypeError('predicate must be a function'); |
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} |
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var list = Object(arr); |
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var len = list.length; |
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if (len === 0) { |
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return -1; |
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} |
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for (var i = 0; i < len; i++) { |
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if (predicate.call(ctx, list[i], i, list)) { |
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return i; |
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} |
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} |
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return -1; |
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};
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