Re: [Haskell-cafe] infinite lists

27 Mar 2007


      On Tue, Mar 27, 2007 at 08:02:18PM +1000, Matthew Brecknell wrote:
...
To: Matthias Fischmann 
Cc: haskell-cafe@haskell.org
From: Matthew Brecknell 
Date: Tue, 27 Mar 2007 20:02:18 +1000
Subject: Re: [Haskell-cafe] infinite lists
Matthias Fischmann:
...
g = do
    n <- randomRIO (0,5)
    let l = replicate n '*'
        i | null l = []
          | otherwise = join $ repeat l
    print (take 12 i)
If you had written (cycle l) instead of (join $ repeat l), you would
have figured it out much quicker. :-)
Prelude> cycle []
*** Exception: Prelude.cycle: empty list
good point.  and now i am learning a new word.  eek!  :)


thanks -
m