array shuffle

shuffle.js

let shuffle = function (array) {
    for (let i = array.length - 1; i > 0; i -= 1) {
        let j = Math.floor(Math.random() * (i + 1));
        let temp = array[i];
        array[i] = array[j];
        array[j] = temp;
    }
    return array;
};