[Haskell-cafe] Re: split string into n parts

[Stefan Holdermans]

> Gah! Brain AWOL. I'm surprised no-one picked me up on
> that. Why didn't I use:
>
> splitAtMb n [] = Nothing
> splitAtMb n l = Just $ splitAt n l

Actually, I've some code lying around doing exactly this (but without  
the padding ;)), written with the coalgebra inlined:

   split n = unfoldr $ \xs -> case xs of
     [] -> Nothing
     _  -> Just (splitAt n xs)

Cheers,

   Stefan