input: Write a function to swap the elements of two arrays of integers. The function should take two arrays as input and swap their elements element-wise. If the arrays are not of 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([10], [11])==None
  assert swap([], [])==None
  assert swap([1, 2], [3]) # This should raise an AssertionError
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