Applying a list of functions in Haskell

Question

I wrote a function that applies a list of functions to an item.

applyAll :: [a -> b] -> a -> [b]
applyAll [] _ = []
applyAll (f:fs) x = (f x) : (a         


        

Answer 1

You could use:

 applyAll l v = fmap ($ v) l

fmap lifts a function over the input list (actually any Functor). $ has type (a -> b) -> a -> b so it applies a function to a given value. ($ v) is a section which applies the given function to v.