input: Write a function to take as input two arrays of integers and swap their elements. The function should ensure that the lengths of both arrays are the same before performing the swap.
  
  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, 3, 5], [2, 4, 6]) == None
  assert swap([7, 8], [9, 10]) == None
  assert swap([0], [0]) == None
  assert swap([1, 2, 3], [4, 5, 6]) == None
output: def swap(arr1, arr2):
      if len(arr1) == len(arr2):
          for i in range(len(arr1)):
              temp = arr1[i]
              arr1[i] = arr2[i]
              arr2[i] = temp