How can I transpose different sized ruby arrays?

Question

I have an array:

arr=[[1,2,3],[4,5],[6]],

I have the following code:

arr.transpose 

but it doesn\'t work,

Answer 1

Using zip as in Stefan's answer is the most straightforward, but if you insist on using transpose, then:

l = arr.map(&:length).max
arr.map{|e| e.values_at(0...l)}.transpose
# => [[1, 4, 6], [2, 5, nil], [3, nil, nil]]

Or without using either:

Array.new(arr.map(&:length).max){|i| arr.map{|e| e[i]}}
# => [[1, 4, 6], [2, 5, nil], [3, nil, nil]]