The following array contains two arrays each having 5 integer values:
[[1,2,3,4,5],[6,7,8,9,10]]
I want to combine these in such a way that it generates five different arrays by combining values of both arrays at index 0,1.. upto 4.
The output should be like this:
[[1,6],[2,7],[3,8],[4,9],[5,10]]
Is there any simplest way to do this?
What about transpose method?
a = [[1, 2, 3, 4, 5], [6, 7, 8, 9, 10]]
#=> [[1, 2, 3, 4, 5], [6, 7, 8, 9, 10]]
a.transpose
#=> [[1, 6], [2, 7], [3, 8], [4, 9], [5, 10]]
this method also can help you in future, as example:
a = [[1, 2, 3, 4, 5], [6, 7, 8, 9, 10], [11, 12, 13, 14, 15]]
#=> [[1, 2, 3, 4, 5], [6, 7, 8, 9, 10], [11, 12, 13, 14, 15]]
a.transpose
#=> [[1, 6, 11], [2, 7, 12], [3, 8, 13], [4, 9, 14], [5, 10, 15]]
a = [[1, 2, 3, 4, 5], [6, 7, 8, 9, 10]]
a.first.zip(a.last)
If you're sure your sub arrays have the same length, you can use Array#transpose :
[[1,2,3,4,5],[6,7,8,9,10]].transpose
#=> [[1, 6], [2, 7], [3, 8], [4, 9], [5, 10]]
As a bonus, it works fine with more than 2 arrays :
[[1,2,3,4,5],[6,7,8,9,10],[11,12,13,14,15]].transpose
#=> [[1, 6, 11], [2, 7, 12], [3, 8, 13], [4, 9, 14], [5, 10, 15]]
If you're not sure your sub arrays have the same length :
[[1,2,3,4,5],[6,7,8,9], [10,11]].reduce(&:zip).map(&:flatten)
#=> [[1, 6, 10], [2, 7, 11], [3, 8, nil], [4, 9, nil], [5, nil, nil]]
Using transpose in this example would throw an IndexError.
Using parallel assignment:
a, b = [[1, 2, 3, 4, 5],[6, 7, 8, 9, 10]]
a.zip b #=> [[1, 6], [2, 7], [3, 8], [4, 9], [5, 10]]
