Proposal: add $> to Data.Functor

[Ben Franksen]

Herbert Valerio Riedel wrote:
> On 2013-12-08 at 02:06:26 +0100, Ben Franksen wrote:
>> Data.Functor has <$> and <$, but not $>, which should be a flipped
>> version of <$, analogous to <*>, <*, and *> in Control.Applicative. I was
>> astonished to see that Data.Functor doesn't have it so I had to write it
>> myself. Then I looked on hackage and found it defined in comonad package
>> (also re-exported from semigroupoids). One (seemingly unmaintained, last
>> version Apr 2012) package named iterIO has it, too.
>>
>> infixl 4 $>
>> -- | Replace the contents of a functor uniformly with a constant value.
>> ($>) :: Functor f => f b -> a -> f a
>> ($>) = flip (<$)
>>
>> I propose to add this to Data.Functor; mostly because I think users
>> expect it there (again by analogy with Applicative), even though it is
>> trivial to write (but then writing <$ is trivial, too).
> 
> fyi, this has been suggested a few months ago as part of
> 
>   http://comments.gmane.org/gmane.comp.lang.haskell.libraries/18952
> 
> and as a matter of fact has been already implemented in base-4.7.0.0:
> 
>   https://github.com/ghc/packages-base/blob/master/Data/Functor.hs#L36-L40

Thanks, I'm glad the proposal has been obsoleted in this way. Count it as a 
+1 after the fact ;-)

Cheers
Ben
-- 
"Make it so they have to reboot after every typo." -- Scott Adams