js utils

shuffle.js

// Fisher-Yates shuffle algorithm
function shuffle(arr) {
  const result = [...arr];
  for (let i = result.length - 1; i >= 0; i -= 1) {
    const j = Math.floor(Math.random() * (i + 1));
    [result[i], result[j]] = [result[j], result[i]];
  }
  return result;
}