input: def reverse_array(arr):
      """ Reverses the order of the values in the given array.
      >>> reverse_array([1, 2, 3, 4, 5])
      [5, 4, 3, 2, 1]
      >>> reverse_array([10, 9, 8, 7])
      [7, 8, 9, 10]
      """
output:     return arr[::-1]