Re: [Haskell-beginners] Help with "20 intermediate haskell exercises"

Am Sonntag 05 Juli 2009 21:05:20 schrieb Patrick LeBoutillier:

Hi,

Thanks for the help. I figured it out after that. I'm having a hard time with the other exercises though, I'm currently stuck at 14:

class Misty m where banana :: (a -> m b) -> m a -> m b unicorn :: a -> m a

-- Exercise 14 -- Relative Difficulty: 6 moppy :: (Misty m) => [a] -> (a -> m b) -> m [b] moppy = error "todo"

moppy [] mop = ? moppy (a:as) mop = (mop a) ?? (moppy as mop) use (among other things) banana and unicorn to replace the question marks

Does anyone know if the solutions are posted anywhere?

They're (under different names) in the standard libraries :)

Patrick