On 20 September 2015 at 11:30, Ömer Sinan Ağacan
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.
Apart from the clashing with other libraries, I mislike this because of it's lack of symmetry: to me it seems odd that the Functor is only on one side (admittedly though, the variant of type (b -> f c) -> (a -> f b) -> a -> f c requires Monad rather than just Functor). -- Ivan Lazar Miljenovic Ivan.Miljenovic@gmail.com http://IvanMiljenovic.wordpress.com