Fisher Yates Shuffle

fisher.js

function shuffle(array) {
  let a = [...array], m = a.length, i
  while (m) {
    // Pick a remaining element
    i = ~~(Math.random() * m--);
    // Swap it with the current element
    [a[m], a[i]] = [a[i], a[m]] 
  }
  return a
}