[Haskell-cafe] Random this! ;-)

michael rice nowgate at yahoo.com
Sun Jul 25 11:39:49 EDT 2010

Hi All,

From: http://en.wikibooks.org/wiki/Haskell/Understanding_monads/State


   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?


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