[reactive] First draft of reactive-tetris

[Conal Elliott]

You can also mix in 'first' and 'second' arbitrarily and read them directly
from the type as well, when there is (possibly nested) pair structure on the
way to the value being modified.  That's why I call fmap, first, and second
"semantic editor combinators".  Sometime soon I'm going to blog about these
tricks.

  - Conal

On Tue, Nov 18, 2008 at 10:20 AM, Creighton Hogg <wchogg at gmail.com> wrote:

>
>
> On Tue, Nov 18, 2008 at 12:15 PM, Conal Elliott <conal at conal.net> wrote:
>
>> Also, a less forgetful version of subs might be useful:
>>
>>      withSubs xs e :: [a] -> Event b -> Event (b,a)
>>
>> and then
>>
>>     subs xs e  = snd <$> withSubs xs e
>>
>> or, if you like,
>>
>>     subs = (fmap.fmap.fmap) snd withSubs
>>
>> Btw, you can read the three fmaps directly from the signature of withSubs
>> (two arrows plus one Event on the way to the pair).
>>
>>   - Conal
>
>
> That's a cute trick with the number of fmap's required.  Never thought of
> it that way.
>
> Also, I'd like to apologize for not mentioning quicksilver from #haskell in
> my last e-mail.  An honest slip-up, but an inappropriate one.
>
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