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34 lines
1.2 KiB
34 lines
1.2 KiB
var bind = require('../internals/function-bind-context'); |
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var IndexedObject = require('../internals/indexed-object'); |
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var toObject = require('../internals/to-object'); |
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var lengthOfArrayLike = require('../internals/length-of-array-like'); |
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// `Array.prototype.{ findLast, findLastIndex }` methods implementation |
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var createMethod = function (TYPE) { |
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var IS_FIND_LAST_INDEX = TYPE == 1; |
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return function ($this, callbackfn, that) { |
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var O = toObject($this); |
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var self = IndexedObject(O); |
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var boundFunction = bind(callbackfn, that); |
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var index = lengthOfArrayLike(self); |
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var value, result; |
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while (index-- > 0) { |
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value = self[index]; |
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result = boundFunction(value, index, O); |
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if (result) switch (TYPE) { |
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case 0: return value; // findLast |
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case 1: return index; // findLastIndex |
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} |
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} |
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return IS_FIND_LAST_INDEX ? -1 : undefined; |
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}; |
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}; |
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module.exports = { |
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// `Array.prototype.findLast` method |
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// https://github.com/tc39/proposal-array-find-from-last |
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findLast: createMethod(0), |
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// `Array.prototype.findLastIndex` method |
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// https://github.com/tc39/proposal-array-find-from-last |
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findLastIndex: createMethod(1) |
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};
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