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