Re: [Haskell-beginners] type of pattern matching

On Wed, Jul 7, 2010 at 9:19 AM, Michael Mossey wrote:

doSomething :: Maybe Result doSomething item = case item of  note@(Note _ _ _ _ _) -> Just $ process note  _                     ->  Nothing

But I don't like writing "Note _ _ _ _ _"

isNote (Note _ _ _ _ _) = True isNote _ = False doSomething :: Maybe Result doSomething item | isNote item = Just $ process note | otherwise = Nothing But I don't like writing "Note _ _ _ _ _"