[Haskell-cafe] infinite lists

[Matthias Fischmann]

On Tue, Mar 27, 2007 at 08:02:18PM +1000, Matthew Brecknell wrote:
> To: Matthias Fischmann <fis at wiwi.hu-berlin.de>
> Cc: haskell-cafe at haskell.org
> From: Matthew Brecknell <haskell at brecknell.org>
> 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