3 Jan
2016
3 Jan
'16
8:11 p.m.
On Mon, 4 Jan 2016, Oliver Charles wrote:
Could you provide some examples where you have found it useful?
E.g. Set has Foldable instance, but not Functor. Using Mapped I can implement argmax in a generic way, such that it also works on Set. argmax :: (Ord b, Foldable f) => (a -> b) -> f a -> a argmax f = snd . Fold.maximumBy (comparing fst) . Mapped (\a -> (f a, a))