19 Sep
2015
19 Sep
'15
9:30 p.m.
I don't know if "I find this very useful" is enough for adding a function to base, but here it goes: infixl 4 <.> (<.>) :: Functor f => (b -> c) -> (a -> f b) -> (a -> f c) f1 <.> f2 = fmap f1 . f2 {-# INLINE (<.>) #-} I first defined this couple of months ago and I find myself looking for this function all the time now. One problem with this is that the name is used by widely used `filepath` library.