input: def reverse_array(arr: List[int]) -> List[int]:
      """ Returns a list with elements in reverse order.
      >>> reverse_array([1, 2, 3, 4, 5])
      [5, 4, 3, 2, 1]
      >>> reverse_array([7, 3, 8, 2])
      [2, 8, 3, 7]
      """
output:     return arr[::-1]