A function to shuffle an array of items

fisher-yates-shuffle.js

/**
 * This function shuffles an array of items.
 * @param arr {Array} array of items
 * @param clone {Boolean} immutable or not
 * @returns {Array} the array of items in random order.
 */
function shuffle(arr, clone) {
  var array = clone ? arr.slice(0) : arr;
  var m = array.length, t, i;

  // While there remain elements to shuffle…
  while (m) {

    // Pick a remaining element…
    i = Math.floor(Math.random() * m--);

    // And swap it with the current element.
    t = array[m];
    array[m] = array[i];
    array[i] = t;
  }

  return array;
}

const cards = new Array(52).fill(1).map((x, i) => i);

console.log(cards); // [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51]
console.log(shuffle(cards)); // [37, 29, 51, 5, 33, 30, 48, 31, 38, 21, 49, 26, 35, 7, 8, 32, 11, 42, 25, 1, 23, 17, 27, 6, 14, 4, 40, 34, 50, 12, 3, 18, 0, 28, 15, 39, 41, 46, 20, 36, 9, 22, 43, 2, 45, 13, 19, 24, 10, 16, 47, 44]