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 |
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9 |
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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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