Re: [Haskell-cafe] How to fold on types?
Try folding over data type constructor with $?
вторник, 25 декабря 2012 г. пользователь Magicloud Magiclouds писал:
Forgot to mention, solution without TemplateHaskell.
On Tue, Dec 25, 2012 at 4:59 PM, Magicloud Magiclouds
magicloud.magiclo...@gmail.com javascript:_e({}, 'cvml',
'magicloud.magiclo...@gmail.com'); wrote:
Say I have things like:
data LongDec = LongDef a b c ... x y z
values = [ 'a', 'b', 'c', ... 'x', 'y', 'z' ]
Now I want them to be LongDef 'a' 'b' 'c' ... 'x' 'y' 'z'.
In form, this is something like folding. But since the type changes, so
code like following won't work:
foldl (\def value - def value) LongDef values
Is it possible to do this in some way?
--
竹密岂妨流水过
山高哪阻野云飞
And for G+, please use magiclouds#gmail.com.
--
竹密岂妨流水过
山高哪阻野云飞
And for G+, please use magiclouds#gmail.com.
--
Best
Timur DeTeam Amirov
Moscow, Russia
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Re: [Haskell-cafe] How to fold on types?
Thinking from subway (: foldl ($) LongDef values ? вторник, 25 декабря 2012 г. пользователь Тимур Амиров писал: Try folding over data type constructor with $? вторник, 25 декабря 2012 г. пользователь Magicloud Magiclouds писал: Forgot to mention, solution without TemplateHaskell. On Tue, Dec 25, 2012 at 4:59 PM, Magicloud Magiclouds magicloud.magiclo...@gmail.com wrote: Say I have things like: data LongDec = LongDef a b c ... x y z values = [ 'a', 'b', 'c', ... 'x', 'y', 'z' ] Now I want them to be LongDef 'a' 'b' 'c' ... 'x' 'y' 'z'. In form, this is something like folding. But since the type changes, so code like following won't work: foldl (\def value - def value) LongDef values Is it possible to do this in some way? -- 竹密岂妨流水过 山高哪阻野云飞 And for G+, please use magiclouds#gmail.com. -- 竹密岂妨流水过 山高哪阻野云飞 And for G+, please use magiclouds#gmail.com. -- Best Timur DeTeam Amirov Moscow, Russia -- Best Timur DeTeam Amirov Moscow, Russia ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Moscow Haskell Users Group (MskHUG) December meeting.
I'm in! Would like to talk with people, writing some web-based production apps! 2012/12/3 Serguey Zefirov sergu...@gmail.com I would like to announce MskHUG December meeting and invite everyone interested. The meeting will take place December 13th, 20:00 to 23:30 in the nice conference center in centre of Moscow: http://www.nf-conference.ru/ The meeting's agenda is to start more intense discussions. Most probably, there will be a couple of short presentations - I can tell about creating fast Haskell programs to handle large data to start the discussion. I will bring white paper and pencils for everyone to write and draw, there will be projector and screen and also tea, cofee and snacks. If you want to participate, please, email me. ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe -- Best Timur DeTeam Amirov Moscow, Russia ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Observer pattern in haskell FRP
Not sure, but maybe you can define a Drawable class with a method in converting inner state to something draw func could use, so it would be like this: draw :: Drawable a = a - IO () вторник, 27 ноября 2012 г. пользователь Nathan Hüsken писал: Hey, When writing games in other (imperative) languages, I like to separate the game logic from the rendering. For this I use something similar to the observer pattern. With rendering I mean anything only related to how objects are drawn to the screen. Animation state for example. On my journey of exploring game programming with haskell (and FRP), I wonder what a good way of archiving something similar would be. If the rendering has no internal state, one can just write a function draw :: GameLogicState - IO () But when the rendering of an object has an internal state (e.g. animation frame) than this is not possible. Now I could write a Wire/Signal (whatever FRP implementation I use) that translates to a RenderingState: render :: Signal GameLogicState RenderingState draw :: RenderingState - IO () which is fine, except when my game is made of many objects. Than I need to associate the state of one object in GameLogicState with a sub-signal in render. That could be done by giving every object an ID and letting GameLogicState contain a map from IDs to ObjectLogicState. I fear that when I really have a lot of objects, assembling and decomposing the map could become a major bottleneck. So I am wondering: Is there (or can someone think of) a different pattern by which this could be archived? Or asked different: How would you do it? Thanks! Nathan ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org javascript:; http://www.haskell.org/mailman/listinfo/haskell-cafe -- Best Timur DeTeam Amirov Moscow, Russia ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Survey: What are the more common Haskell IDEs in use ?
SublimeText is fine 2012/11/24 David Virebayre dav.vire+hask...@gmail.com I often use geany too 2012/11/24 Erik de Castro Lopo mle...@mega-nerd.com: Dan wrote: Because I see there are many preferences on what IDE to use for Haskell I've created a quick survey on this topic. Please click here and select your choices from the lists. http://kwiksurveys.com/s.asp?sid=oqr42h4jc8h0nbc53652 Any comments/suggestions are welcome. I use Geany which is not on the list. Erik -- -- Erik de Castro Lopo http://www.mega-nerd.com/ ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe -- Best Timur DeTeam Amirov Moscow, Russia ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
