[Haskell-cafe] Practical introduction to monads
padator at wanadoo.fr
Tue Aug 2 16:28:15 EDT 2005
On 2 août 05, at 22:03, Paul Moore wrote:
> I've started learning Haskell, and I'm going through all the tutorial
> material I can find - there's a lot of good stuff available.
> One thing I haven't found a really good discussion of, is practical
> examples of building monads. There's plenty of discussion of the IO
> monad, and the state monad, and a lot of good theory on monads, but
> although I've seen tantalising statements about how powerful the
> ability to define your own monads can be, but no really concrete
> examples - something along the lines of
> - here is problem X
> - this might be our first cut at coding it
> - we can abstract out this stuff, as a monad
> - see how the code looks now, how much cleaner it is
> (I've seen this type of model developing a state monad, but I'm
> looking for a more application-specific approach).
have you read this
It presents a pb, show how it sux when coded naively without monad,
and then show
how beautiful the code is when you use a monad.
I have also one time read an example where you use monads while
implementing the unification or type inference algorithm, perhaps in
monad paper (the essence of functional programming).
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