1 | var baseRandom = require('./_baseRandom');
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2 |
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3 | /**
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4 | * A specialized version of `_.shuffle` which mutates and sets the size of `array`.
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5 | *
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6 | * @private
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7 | * @param {Array} array The array to shuffle.
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8 | * @param {number} [size=array.length] The size of `array`.
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9 | * @returns {Array} Returns `array`.
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10 | */
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11 | function shuffleSelf(array, size) {
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12 | var index = -1,
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13 | length = array.length,
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14 | lastIndex = length - 1;
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15 |
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16 | size = size === undefined ? length : size;
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17 | while (++index < size) {
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18 | var rand = baseRandom(index, lastIndex),
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19 | value = array[rand];
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20 |
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21 | array[rand] = array[index];
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22 | array[index] = value;
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23 | }
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24 | array.length = size;
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25 | return array;
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26 | }
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27 |
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28 | module.exports = shuffleSelf;
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