[Haskell-beginners] iterated function value sequence

[John M. Dlugosz]

On 4/4/2014 3:35 PM, Bob Ippolito wrote:
> There's a function named iterate in Prelude:
>
> λ> :info iterate
> iterate :: (a -> a) -> a -> [a] -- Defined in `GHC.List'
> λ> take 8 (iterate (\x -> 2 * x + 1) 0)
> [0,1,3,7,15,31,63,127]
>
Nice.  I followed up with that to understand how it's written.

Now, how might I do something like that but "forget" previous values to free up memory?

—John