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Last change
on this file since 76712b2 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
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initial commit
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| 1 | 'use strict';
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| 2 | /* eslint-disable es/no-array-prototype-lastindexof -- safe */
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| 3 | var toIndexedObject = require('../internals/to-indexed-object');
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| 4 | var toInteger = require('../internals/to-integer');
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| 5 | var toLength = require('../internals/to-length');
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| 6 | var arrayMethodIsStrict = require('../internals/array-method-is-strict');
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| 7 |
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| 8 | var min = Math.min;
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| 9 | var $lastIndexOf = [].lastIndexOf;
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| 10 | var NEGATIVE_ZERO = !!$lastIndexOf && 1 / [1].lastIndexOf(1, -0) < 0;
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| 11 | var STRICT_METHOD = arrayMethodIsStrict('lastIndexOf');
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| 12 | var FORCED = NEGATIVE_ZERO || !STRICT_METHOD;
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| 13 |
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| 14 | // `Array.prototype.lastIndexOf` method implementation
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| 15 | // https://tc39.es/ecma262/#sec-array.prototype.lastindexof
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| 16 | module.exports = FORCED ? function lastIndexOf(searchElement /* , fromIndex = @[*-1] */) {
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| 17 | // convert -0 to +0
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| 18 | if (NEGATIVE_ZERO) return $lastIndexOf.apply(this, arguments) || 0;
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| 19 | var O = toIndexedObject(this);
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| 20 | var length = toLength(O.length);
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| 21 | var index = length - 1;
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| 22 | if (arguments.length > 1) index = min(index, toInteger(arguments[1]));
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| 23 | if (index < 0) index = length + index;
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| 24 | for (;index >= 0; index--) if (index in O && O[index] === searchElement) return index || 0;
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| 25 | return -1;
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| 26 | } : $lastIndexOf;
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