input: Write a python function to calculate the absolute difference between elements of two arrays.
  assert calc_diff([1, 2, 3], [4, 5, 6]) == [3, 3, 3]
  assert calc_diff([10, 20, 30], [5, 15, 25]) == [5, 5, 5]
  assert calc_diff([7, 8, 9], [3, 2, 1]) == [4, 6, 8]
output: def calc_diff(arr1, arr2):
      return [abs(a - b) for a, b in zip(arr1, arr2)]