Hello, For my own exercise I'm writing a function 'weave' that "weaves" a list of lists together. For example: weave [[1,1,1], [2,2,2], [3,3]] ==> [1,2,3,1,2,3,1,2] weave [[1,1,1], [2,2], [3,3,3]] ==> [1,2,3,1,2,3,1] Note that 'weave' stops when a list is empty. Right now I have: weave :: [[a]] -> [a] weave ll = work ll [] [] where work ll = foldr f (\rst acc -> work (reverse rst) [] acc) ll f [] g = \_ acc -> reverse acc f (x:xs) g = \rst acc -> g (xs:rst) (x:acc) However I find this definition hard to read and I'm questioning its efficiency especially due to the 'reverse' parts (how do they impact performance and can they be removed?) So I'm wondering if 'weave' can be defined more "elegantly" (better readable, shorter, more efficient, etc.)? happy hacking, Bas van Dijk