shuffle.js

function shuffle(array, result = []) {
  if (array.length === 0) {
    return result;
  }

  const randomIndex = Math.floor(Math.random() * (array.length - 1));
  const item = array[randomIndex];
  const tail = [
    ...array.slice(0, randomIndex),
    ...array.slice(randomIndex + 1),
  ];

  return shuffle(tail, [...result, item]);
}