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22 lines
697 B
JavaScript
22 lines
697 B
JavaScript
'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` getter
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// https://github.com/keithamus/proposal-array-last
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if (DESCRIPTORS && !('lastIndex' in [])) {
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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 = toLength(O.length);
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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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