[Haskell-cafe] laziness

[Taral]

On 12/9/06, Ranjan Bagchi <ranjan.bagchi at frotz.com> wrote:
> Which is great.. however, what I'd like to fold the list over a tuple:
>  >foo x (l,payload) = ((x:l), payload)
>  >(x,_) = foldr foo ([], Nothing) [1..]
>  >(take 10) x
>
> Doesn't terminate, until the stack overflows

Look at Data.List's mapAccumR function.

-- 
Taral <taralx at gmail.com>
"You can't prove anything."
    -- Gödel's Incompetence Theorem