Question

/**
 * @param {array} arr
 */
export function arrScrambling(arr) {
  let array = arr;
  let index = array.length;
  while (index) {
    index -= 1;
    let randomIndex = Math.floor(Math.random() * index);
    let middleware = array[index];
    array[index] = array[randomIndex];
    array[randomIndex] = middleware
  }
  return array
}