1 | var randInt = require('../random/randInt');
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2 |
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3 | /**
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4 | * Shuffle array items.
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5 | */
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6 | function shuffle(arr) {
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7 | var results = [],
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8 | rnd;
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9 | if (arr == null) {
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10 | return results;
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11 | }
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12 |
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13 | var i = -1, len = arr.length;
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14 | while (++i < len) {
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15 | if (!i) {
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16 | results[0] = arr[0];
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17 | } else {
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18 | rnd = randInt(0, i);
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19 | results[i] = results[rnd];
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20 | results[rnd] = arr[i];
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21 | }
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22 | }
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23 |
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24 | return results;
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25 | }
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26 |
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27 | module.exports = shuffle;
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28 |
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