(<.>) operator (generalizing (.) to Functor)
Currently there are following operators:
(<$>) :: (a -> b) -> f a -> f b
($) :: (a -> b) -> a -> b
(.) :: (b -> c) -> (a -> b) -> a -> c
However defining the operator that is to <$> as . is to $ is trivial:
(<.>) :: (b -> c) -> (a -> f b) -> a -> f c
f <.> g = fmap f . g
It would help writing in pointless style using Functors (as well as Applicatives/Monads etc.)
Trac metadata
Trac field | Value |
---|---|
Version | 6.12.3 |
Type | FeatureRequest |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | libraries/base |
Test case | |
Differential revisions | |
BlockedBy | |
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Blocking | |
CC | |
Operating system | |
Architecture |