[RUBY] How to add the same Indexes in a nested array

Thing you want to do

numbers = [

I was thinking of a method to get the following array by adding the same indexes from such an array.

sums = [12, 15, 18]


numbers = [[1,2,3], [4,5,6], [7,8,9]]
sums = numbers.transpose.map{ |num| num.sum }


At first, I was thinking about the nested "how to get the 0th of the array", and I was worried about the efficient acquisition method. However, if you think of it as a matrix and transpose it, it was one shot.

Matrix transpose is possible with transpose in Ruby. Reference: instance method Array # transpose

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