input: from typing import List
  
  def reverse_array(arr: List[int]) -> List[int]:
      """ Reverse the order of elements in the given array of integers.
      >>> reverse_array([1, 2, 3, 4, 5])
      [5, 4, 3, 2, 1]
      >>> reverse_array([10, 20, 30])
      [30, 20, 10]
      """
output:     return arr[::-1]