input: Write a function in Python that takes an array of integer values and reverses the order of the values.
  
  ### Input:
  [1, 2, 3, 4, 5]
  
  ### Output:
  def reverse_array(arr):
    return arr[::-1]  # Returns a slice of the list in reverse order
  
  assert reverse_array([1, 2, 3, 4, 5])==[5, 4, 3, 2, 1]
  assert reverse_array([10, 20, 30])==[30, 20, 10]
  assert reverse_array([])==[]
  assert reverse_array([7])==[7]
output: def reverse_array(arr):
    return arr[::-1]