rfc: Additions to Data.Either (take 2)

[Alois Cochard]

+1 for proposal 1

Strongly against adding other map* functions.


On 21 April 2014 21:43, Oliver Charles <ollie at ocharles.org.uk> wrote:

> On Mon, Apr 21, 2014 at 9:01 PM, João Cristóvão <jmacristovao at gmail.com>wrote:
>
>>
>> Proposal 0:
>> ----------------
>>
>> Do nothing
>>
>
> Seeing as this has come up a bunch of times, -1 - as we clearly need to do
> *something*.
>
> Proposal 1:
>> ----------------
>> Add no new code, but document Data.Either to mention how to use `left`
>> and (+++) from Control.Arrow
>>
>
> +1
>
>
>> Proposal 2:
>> ----------------
>> Document Control.Arrow to exemplify the (->) instance usage.
>>
>
> More examples is in general a good idea - I see no harm in this. +1
>
>
>> Proposal 3:
>> ----------------
>>
>
> Proposal 4:
>> ----------------
>>
>
>
>>
>> Proposal 5:
>> ----------------
>>
>> == Proposal 4, using the mapEither name instead.
>>
>
> Indifferent on these.
>
>
>> Proposal 6:
>> ----------------
>>
>> Implement mapRight in Data.Either
>>
>> 6a) ... as (b -> c) -> Either a b -> Either a c
>> 6b) ... as fmap
>>
>
> -1 on this, as we don't have 'mapJust' and Functor is hardly an esoteric
> type class.
>
>
> Proposal 7:
>> ----------------
>>
>> Don't implement mapRight, but include documentation in Data.Either
>> stating that it is just fmap.
>>
>
> Again, more documentation is almost always a good thing. +1
>
>
> Proposal 8:
>> ----------------
>>
>> Bring bifunctors to base.
>>
>
> -1, and seems at ends with the split base proposals. I don't see much
> value in growing base a whole lot more. I'm probably opening a whole
> 'nother can of worms. Apologies ;)
>
>>
>
> - ocharles
>
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>


-- 
*Alois Cochard*
http://aloiscochard.blogspot.com
http://twitter.com/aloiscochard
http://github.com/aloiscochard
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