input: Write a function to take two arrays of integers as input and swap their elements. The function should ensure that both arrays have the same length before performing the swap operation. If the arrays do not have the same length, the function should raise an assertion error. 
  
  def swap(arr1, arr2):
      assert len(arr1) == len(arr2)
      for i in range(len(arr1)):
          temp = arr1[i]
          arr1[i] = arr2[i]
          arr2[i] = temp
  
  assert swap([3, 5, 6, 9], [2, 4, 7, 8]) == None
  assert swap([1, 2, 3], [4, 5, 6]) == None
  assert swap([7, 8], [9, 10]) == None
  assert swap([1], [2]) == None
  assert swap([], []) == None
output: def swap(arr1, arr2):
      assert len(arr1) == len(arr2)
      for i in range(len(arr1)):
          temp = arr1[i]
          arr1[i] = arr2[i]
          arr2[i] = temp