1 | 'use strict';
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2 | var isArray = require('../internals/is-array');
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3 | var lengthOfArrayLike = require('../internals/length-of-array-like');
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4 | var doesNotExceedSafeInteger = require('../internals/does-not-exceed-safe-integer');
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5 | var bind = require('../internals/function-bind-context');
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6 |
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7 |
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8 |
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9 | var flattenIntoArray = function (target, original, source, sourceLen, start, depth, mapper, thisArg) {
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10 | var targetIndex = start;
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11 | var sourceIndex = 0;
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12 | var mapFn = mapper ? bind(mapper, thisArg) : false;
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13 | var element, elementLen;
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14 |
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15 | while (sourceIndex < sourceLen) {
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16 | if (sourceIndex in source) {
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17 | element = mapFn ? mapFn(source[sourceIndex], sourceIndex, original) : source[sourceIndex];
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18 |
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19 | if (depth > 0 && isArray(element)) {
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20 | elementLen = lengthOfArrayLike(element);
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21 | targetIndex = flattenIntoArray(target, original, element, elementLen, targetIndex, depth - 1) - 1;
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22 | } else {
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23 | doesNotExceedSafeInteger(targetIndex + 1);
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24 | target[targetIndex] = element;
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25 | }
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26 |
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27 | targetIndex++;
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28 | }
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29 | sourceIndex++;
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30 | }
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31 | return targetIndex;
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32 | };
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33 |
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34 | module.exports = flattenIntoArray;
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