code: function randomize(array) {
    let n = array.length;
  
    while (n) {
      n -= 1;
      const i = Math.floor(Math.random() * (n + 1));
      const temp = array[i];
      array[i] = array[n];
      array[n] = temp;
    }
  
    return array;
  }
docs: Fisher-Yates shuffle.
  http://stackoverflow.com/a/962890/373422
  https://bost.ocks.org/mike/shuffle/
  @param {Array} array Array to shuffle.
  @return {Array} Randomly sorted array.