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21 lines
695 B
21 lines
695 B
'use strict'; |
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var DESCRIPTORS = require('../internals/descriptors'); |
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var addToUnscopables = require('../internals/add-to-unscopables'); |
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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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var defineProperty = require('../internals/object-define-property').f; |
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// `Array.prototype.lastIndex` getter |
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// https://github.com/keithamus/proposal-array-last |
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if (DESCRIPTORS) { |
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defineProperty(Array.prototype, 'lastIndex', { |
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configurable: true, |
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get: function lastIndex() { |
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var O = toObject(this); |
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var len = lengthOfArrayLike(O); |
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return len == 0 ? 0 : len - 1; |
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} |
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}); |
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addToUnscopables('lastIndex'); |
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}
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