Kata

Let "split-form" represent a positive integer that is split into its respective digits. For instance, the split-form of 123 is: [1, 2, 3]

Write a class Addition that can be initialized with two split-form operands and has a sum method that returns the sum of the two operands, also in split-form.

Example

Addition.new([1, 2, 3], [2, 3]).sum  -->  [1, 4, 6]

Addition([1, 2, 3], [2, 3]).sum()  -->  [1, 4, 6]

The join function cannot be used; rather, you should aim to make an adder that can perform long streams of addition.