[Haskell-cafe] do

[Peter Verswyvelen]

I'm also a Haskell no-so-new-anymore-bie, and for me,  understanding 
monads was a question of first reading the available docs, especially

http://sigfpe.blogspot.com/2006/08/you-could-have-invented-monads-and.html

and http://haskell.org/haskellwiki/IO_inside,

plus reading the Haskell School of Expression <http://haskell.org/soe/> 
book,

but mainly, creating some of the monad instances myself, step by step (I 
started with a random number generator, and ended with the list monad). 
I found this very useful, and I actually had to look many times to the 
existing solution to get it right. It made me appreciate the genius 
minds behind this. After a bit of practice, I can now use monads almost 
as easy as I can write imperative C/C++/C# code, although I find this is 
also the dangerous part of the do notation: you tend to forget the 
beautiful pure functional implementation that is behind the scenes, and 
start to think imperatively (again)...

If you want I can dig up my old source code where I converted a random 
number generator from a purely functional approach to a monadic 
approach, but I'm not sure reading it would help you, it's creating the 
code yourself that will be useful I guess.

Good luck,
Peter Verswyvelen














avid48 wrote:
> On 10/14/07, jerzy.karczmarczuk at info.unicaen.fr
>   
>> I know that asking helpful humans is nicer than reading docs, but the latter
>> is usually more instructive, and often more efficient.
>>     
>
> Sorry, but from my newbie point of view, I think the docs are
> sometimes poor and lacking. After seeing the docs, I might want to ask
> the list some explanation; if I get a reply pointing me back to the
> doc, it doesn't help.
> _______________________________________________
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>
>   

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