You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
29 lines
689 B
29 lines
689 B
3 years ago
|
var baseRandom = require('./_baseRandom');
|
||
|
|
|
||
|
|
/**
|
||
|
|
* A specialized version of `_.shuffle` which mutates and sets the size of `array`.
|
||
|
|
*
|
||
|
|
* @private
|
||
|
|
* @param {Array} array The array to shuffle.
|
||
|
|
* @param {number} [size=array.length] The size of `array`.
|
||
|
|
* @returns {Array} Returns `array`.
|
||
|
|
*/
|
||
|
|
function shuffleSelf(array, size) {
|
||
|
|
var index = -1,
|
||
|
|
length = array.length,
|
||
|
|
lastIndex = length - 1;
|
||
|
|
|
||
|
|
size = size === undefined ? length : size;
|
||
|
|
while (++index < size) {
|
||
|
|
var rand = baseRandom(index, lastIndex),
|
||
|
|
value = array[rand];
|
||
|
|
|
||
|
|
array[rand] = array[index];
|
||
|
|
array[index] = value;
|
||
|
|
}
|
||
|
|
array.length = size;
|
||
|
|
return array;
|
||
|
|
}
|
||
|
|
|
||
|
|
module.exports = shuffleSelf;
|