Source: \shuffle.js
import copyArray from './.internal/copyArray.js'
/**
* Creates an array of shuffled values, using a version of the
* [Fisher-Yates shuffle](https://en.wikipedia.org/wiki/Fisher-Yates_shuffle).
*
* @since 0.1.0
* @category Array
* @param {Array} array The array to shuffle.
* @returns {Array} Returns the new shuffled array.
* @example
*
* shuffle([1, 2, 3, 4])
* // => [4, 1, 3, 2]
*/
function shuffle(array) {
const length = array == null ? 0 : array.length
if (!length) {
return []
}
let index = -1
const lastIndex = length - 1
const result = copyArray(array)
while (++index < length) {
const rand = index + Math.floor(Math.random() * (lastIndex - index + 1))
const value = result[rand]
result[rand] = result[index]
result[index] = value
}
return result
}
export default shuffle