[Haskell-cafe] Random this! ;-)

[Tobias Brandt]

Look for the function replicateM in the module Control.Monad.

On 25 July 2010 17:39, michael rice <nowgate at yahoo.com> wrote:

> Hi All,
>
> From: http://en.wikibooks.org/wiki/Haskell/Understanding_monads/State
>
>                            Exercises
>
>    1. Implement a function rollNDiceIO :: Int -> IO [Int] that,
>       given an integer, returns a list with that number of pseudo-
>       random integers between 1 and 6.
>
>
> After a lot of learning what not to do, this is the best I could come up
> with.
>
> rollNDiceIO :: Int -> IO [Int]
> rollNDiceIO n = mapM (\x -> randomRIO(1,6)) (replicate n 1)
>
> I know, ugly, but at least I got it to work. What's a better way to
> generate this list?
>
> Michael
>
>
>
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