Implement minimumOn, maximumOn to mirror sortOn

By importing Data.List, we currently get:

sortBy :: (a -> a -> Ordering) -> [a] -> [a]
maximumBy :: Foldable t => (a -> a -> Ordering) -> t a -> a
minimumBy :: Foldable t => (a -> a -> Ordering) -> t a -> a

sortOn :: Ord b => (a -> b) -> [a] -> [a]

I believe sortOn to be a very useful 'shortcut'. In that spirit, I propose we add:

maximumOn :: (Foldable t, Ord b) => (a -> b) -> t a -> a
minimumOn :: (Foldable t, Ord b) => (a -> b) -> t a -> a

Trac metadata

Trac field	Value
Version	8.5
Type	FeatureRequest
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	libraries/base
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