[Haskell-cafe] Simple list processing

[Daniel Fischer]

Am Mittwoch, 11. Juni 2008 20:17 schrieb Andrew Coppin:
>
> So it looks like this can be implemented as a fold or an unfold. But
> neither way looks especially easy. Both of these patterns seem to be
> more general than necessary; I only want to take 1 element of input and
> produce 1 element of output, but keeping track of a running state.

scanl might be a sufficiently lightweight way to do that (or it might not, 
depending on what you actually want to do).