Last change
on this file since e29cc2e was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
initial commit
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[6a3a178] | 1 | 'use strict';
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| 2 | var DESCRIPTORS = require('../internals/descriptors');
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| 3 | var addToUnscopables = require('../internals/add-to-unscopables');
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| 4 | var toObject = require('../internals/to-object');
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| 5 | var toLength = require('../internals/to-length');
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| 6 | var defineProperty = require('../internals/object-define-property').f;
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| 7 |
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| 8 | // `Array.prototype.lastIndex` getter
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| 9 | // https://github.com/keithamus/proposal-array-last
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| 10 | if (DESCRIPTORS && !('lastIndex' in [])) {
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| 11 | defineProperty(Array.prototype, 'lastIndex', {
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| 12 | configurable: true,
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| 13 | get: function lastIndex() {
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| 14 | var O = toObject(this);
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| 15 | var len = toLength(O.length);
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| 16 | return len == 0 ? 0 : len - 1;
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| 17 | }
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| 18 | });
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| 19 |
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| 20 | addToUnscopables('lastIndex');
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| 21 | }
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