[Haskell-cafe] Random question
vlm at lionet.info
Wed Sep 24 17:07:52 EDT 2008
Iain Barnett wrote:
> I have a function, that produces a random number between two given numbers
> rand :: Int -> Int -> IO Int
> rand low high = getStdRandom (randomR (low,high))
> (Naively) I'd like to write something like
> take (rand 1 10 ) [1..10]
> and see [1,2,3,4] ... or anything but nasty type-error messages.
myTake :: IO [Int]
myTake = do
n <- rand 1 10
take n [1..10]
myTake = rand 1 10 >>= \n -> take n [1..10]
myTake = rand 1 10 >>= flip take [1..10]
> I'm reading about 6 tutorials on monads simultaneously but still can't
> crack this simple task, and won't pain you with all the permutations of
> code I've already tried. It's a lot, and it ain't pretty.
> Would anyone be able to break away from C/C++ vs Haskell to help? Just a
> point in the right direction or a good doc to read, anything that helps
> will be much appreciated.
Monad enlightenment happens after 7'th monad tutorial. Verified by me
and a few of my friends.
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