input: 
  from typing import List
  
  def reverse_array(arr: List[int]) -> List[int]:
      """ Reverse the order of elements in a given list of integers.
      >>> reverse_array([1, 2, 3, 4, 5])
      [5, 4, 3, 2, 1]
      >>> reverse_array([10, 20, 30, 40, 50])
      [50, 40, 30, 20, 10]
      """
      return arr[::-1]  # Returns a slice of the list in reverse order
  
output:     return arr[::-1]  # Returns a slice of the list in reverse order