How to add two multidimensional arrays

Question

I want to do the following:

array1 = [[1, 10], [2, 20], [3, 10], [4, 30]]
array2 = [[1, 10], [2, 10], [3, 5], [4, 10]]

I want to add two arrays in such a way that the second element of each subarray will be added. I want the following output.

result = [[1,20],[2,30],[3,15],[4,40]]

Answer 1

[array1, array2].transpose.map{|(k, v1), (_, v2)| [k, v1 + v2]}
# => [[1, 20], [2, 30], [3, 15], [4, 40]]