function functionalFib(numOfElements) {
  function fib(a) {
    if (a === 0) {
      return 0;
    }
    if (a === 1) {
      return 1;
    }
    return fib(a - 1) + fib(a - 2);
  }

  function repeat(num, max, arr) {
    if (num > max) {
      return arr;
    }
    return repeat(num + 1, max, [].concat(arr, fib(num)))
  }
  return repeat(1, numOfElements, []);
}