text: const arr = Array(1000).fill(null);
  arr.forEach((el, i) => (arr[i] = i));
  
  // http://stackoverflow.com/questions/962802#962890
  function shuffle(array) {
    let current;
    let top = array.length;
    if (top)
      while (--top) {
        current = Math.floor(Math.random() * (top + 1));
        [array[current], array[top]] = [array[top], array[current]];
      }
    return array;
  }
  
  module.exports = shuffle(arr);
  