Re: [Haskell-beginners] type problems with my little code

First of all, Raffa, welcome to the list. I hope your stay is friendly and that you'll derive benefit from it over the long-term. This line that you wrote pack' (x:y) = extra x xs ++ pack' y suggests that you might want to review the different between list-consing, which is the (:) function, and list-append, which is (++). Especially for Haskell, you'll need to pay close attention to how the type signatures differ. These concepts are very, very old and easily google-able. A solid foundation in these fundamentals will make tackling the rest of the 99 problems so much easier. -- Kim-Ee