[Haskell-cafe] Thinking about an unlistN

Michael Feathers mfeathers at mindspring.com
Sun Aug 10 14:47:20 EDT 2008

I wrote this function the other day, and I was wondering if I'm missing 
something.. whether there is already a function or idiom around to do this.

unlist3 :: (a -> a -> a -> b) -> [a] -> b
unlist3 f (x:y:z:xs) = f x y z

I was also wondering whether the function can be generalized to N or 
whether this is just one of those edges in the type system that you 
can't abstract over.



More information about the Haskell-Cafe mailing list