1 | /**
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2 | * Private `concat` function to merge two array-like objects.
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3 | *
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4 | * @private
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5 | * @param {Array|Arguments} [set1=[]] An array-like object.
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6 | * @param {Array|Arguments} [set2=[]] An array-like object.
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7 | * @return {Array} A new, merged array.
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8 | * @example
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9 | *
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10 | * _concat([4, 5, 6], [1, 2, 3]); //=> [4, 5, 6, 1, 2, 3]
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11 | */
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12 | function _concat(set1, set2) {
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13 | set1 = set1 || [];
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14 | set2 = set2 || [];
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15 | var idx;
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16 | var len1 = set1.length;
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17 | var len2 = set2.length;
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18 | var result = [];
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19 | idx = 0;
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20 |
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21 | while (idx < len1) {
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22 | result[result.length] = set1[idx];
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23 | idx += 1;
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24 | }
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25 |
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26 | idx = 0;
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27 |
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28 | while (idx < len2) {
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29 | result[result.length] = set2[idx];
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30 | idx += 1;
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31 | }
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32 |
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33 | return result;
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34 | }
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35 |
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36 | module.exports = _concat; |
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