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26 lines
863 B
26 lines
863 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 toLength = require('../internals/to-length'); |
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var defineProperty = require('../internals/object-define-property').f; |
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// `Array.prototype.lastIndex` accessor |
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// https://github.com/keithamus/proposal-array-last |
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if (DESCRIPTORS && !('lastItem' in [])) { |
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defineProperty(Array.prototype, 'lastItem', { |
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configurable: true, |
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get: function lastItem() { |
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var O = toObject(this); |
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var len = toLength(O.length); |
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return len == 0 ? undefined : O[len - 1]; |
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}, |
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set: function lastItem(value) { |
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var O = toObject(this); |
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var len = toLength(O.length); |
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return O[len == 0 ? 0 : len - 1] = value; |
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} |
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}); |
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addToUnscopables('lastItem'); |
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}
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