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28 lines
689 B
28 lines
689 B
var baseRandom = require('./_baseRandom'); |
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/** |
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* A specialized version of `_.shuffle` which mutates and sets the size of `array`. |
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* |
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* @private |
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* @param {Array} array The array to shuffle. |
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* @param {number} [size=array.length] The size of `array`. |
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* @returns {Array} Returns `array`. |
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*/ |
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function shuffleSelf(array, size) { |
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var index = -1, |
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length = array.length, |
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lastIndex = length - 1; |
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size = size === undefined ? length : size; |
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while (++index < size) { |
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var rand = baseRandom(index, lastIndex), |
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value = array[rand]; |
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array[rand] = array[index]; |
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array[index] = value; |
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} |
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array.length = size; |
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return array; |
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} |
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module.exports = shuffleSelf;
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