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

A similar answer was posted (but deleted) an hour earlier:

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

arr[0].zip(*arr[1..-1])
#=> [[1, 4, 6], [2, 5, nil], [3, nil, nil]]

The above is equivalent to:

[1, 2, 3].zip([4, 5], [6])

This approach assumes that your first sub-array is always the longest. Otherwise the result will be truncated:

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

arr[0].zip(*arr[1..-1])
#=> [[1, 3, 6], [2, 4, nil]]  missing: [nil, 5, nil]