Proposal: Add isLeft/isRight to Data.Either

[Bas van Dijk]

On 7 December 2012 10:49, Bas van Dijk <v.dijk.bas at gmail.com> wrote:
> On 7 December 2012 10:25, Erik Hesselink <hesselink at gmail.com> wrote:
>> On Fri, Dec 7, 2012 at 9:29 AM, Bas van Dijk <v.dijk.bas at gmail.com> wrote:
>>> On 6 December 2012 23:05, Evan Laforge <qdunkan at gmail.com> wrote:
>>>>>>   - I often use the 'when'-like combinator 'whenJust' in monadic code:
>>>>>>
>>>>>>      whenJust :: Monad m => Maybe a -> (a -> m ()) -> m ()
>>>>>>      whenJust (Just x) a = a x
>>>>>>      whenJust _        _ = return ()
>>>>>
>>>>>
>>>>> +1. whenJust is defined also in Agda.Utils.Monad, should also added to
>>>>> Control.Monad.
>>>>
>>>> Off topic, but I have whenJust in my local library too, and I use it
>>>> all the time.
>>>
>>> In a project at work:
>>>
>>> $ grep -r whenJust --include=\*.hs . | wc -l
>>> 27
>>
>> There is no need to define whenJust, since it is just a specialization
>> of forM_ from Data.Foldable.
>
> Thanks for pointing this out! Replacing the 27 whenJusts as we speak...

hvr, I see you pointed this out earlier. Thanks.