require 'generator'
xy = [["a","b"],["c","d"],["e","f"]]
yx = SyncEnumerator.new(*xy).collect
p yx=> [["a", "c", "e"], ["b", "d", "f"]]
I think there's another way in one of the standard libraries, but I
don't have a memory, so I just remember generally useful things like
SyncEnumerator and work from first principles.
just helping your memory:
p xy.transpose
#=> [["a", "c", "e"], ["b", "d", "f"]]
cheers
Simon