[Haskell-cafe] what do you think of haskell ? (yes, it's a bit general ...:)

Henning Thielemann lemming at henning-thielemann.de
Thu Jun 15 15:59:35 EDT 2006

On Thu, 15 Jun 2006, minh thu wrote:

> * randomIO
> side-effect is nicely resolved with monad. and you have to thread your state.
> if you're writing your monad or use a transformer, things are quite
> explicitly (even if it's implicit in the do notation) threaded.

You know that random generators are not bounded to IO? 'random' and 
related functions work just like the random generators in object oriented 
designs. In OO languages the random generator is usually an object which 
hides a state and there can be several instances of random generators. In 
Haskell the random generator can be viewed as a State monad. But you are 
right, you have to carry the monad with you all the time. Alternatively it 
is sometimes simpler to consume values from a list generated by randomRs.

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