Simon Marlow schrieb:
Would someone like to make a concrete proposal (with code!) for 2-3 functions we could reasonably add to Data.List?
Here is my proposal that is consistent with Data.PackedString and "lines" (i.e a final delimiter is ignored -- by extra code) {- | The 'splitWith' function takes a predicate and splits the input list at each element which satisfies the predicate. -} splitWith :: (a -> Bool) -> [a] -> [[a]] splitWith p s = case s of [] -> [] _ -> let (l, r) = break p s in case r of _ : t@(_ : _) -> l : splitWith p t _ -> [l] {- | The 'split' function splits the input list on each occurrence of the given element. -} split :: Eq a => a -> [a] -> [[a]] split c = splitWith (== c)