1var baseRandom = require('./_baseRandom');
2
3/**
4 * A specialized version of `_.shuffle` which mutates and sets the size of `array`.
5 *
6 * @private
7 * @param {Array} array The array to shuffle.
8 * @param {number} [size=array.length] The size of `array`.
9 * @returns {Array} Returns `array`.
10 */
11function shuffleSelf(array, size) {
12  var index = -1,
13      length = array.length,
14      lastIndex = length - 1;
15
16  size = size === undefined ? length : size;
17  while (++index < size) {
18    var rand = baseRandom(index, lastIndex),
19        value = array[rand];
20
21    array[rand] = array[index];
22    array[index] = value;
23  }
24  array.length = size;
25  return array;
26}
27
28module.exports = shuffleSelf;
29