1 | 'use strict';
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2 |
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3 | var apply = require('../internals/function-apply');
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4 | var toIndexedObject = require('../internals/to-indexed-object');
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5 | var toIntegerOrInfinity = require('../internals/to-integer-or-infinity');
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6 | var lengthOfArrayLike = require('../internals/length-of-array-like');
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7 | var arrayMethodIsStrict = require('../internals/array-method-is-strict');
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8 |
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9 | var min = Math.min;
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10 | var $lastIndexOf = [].lastIndexOf;
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11 | var NEGATIVE_ZERO = !!$lastIndexOf && 1 / [1].lastIndexOf(1, -0) < 0;
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12 | var STRICT_METHOD = arrayMethodIsStrict('lastIndexOf');
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13 | var FORCED = NEGATIVE_ZERO || !STRICT_METHOD;
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14 |
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15 |
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16 |
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17 | module.exports = FORCED ? function lastIndexOf(searchElement /* , fromIndex = @[*-1] */) {
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18 |
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19 | if (NEGATIVE_ZERO) return apply($lastIndexOf, this, arguments) || 0;
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20 | var O = toIndexedObject(this);
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21 | var length = lengthOfArrayLike(O);
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22 | if (length === 0) return -1;
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23 | var index = length - 1;
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24 | if (arguments.length > 1) index = min(index, toIntegerOrInfinity(arguments[1]));
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25 | if (index < 0) index = length + index;
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26 | for (;index >= 0; index--) if (index in O && O[index] === searchElement) return index || 0;
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27 | return -1;
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28 | } : $lastIndexOf;
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