Hi Rob, have a look at http://clojure.org/sequences and then on that
page there's a reference to http://clojure.org/lazy, which explains
the evolution of the lazy/eager sequences. Next is used for eager
cases (e.g loop/recur) and rest for lazy-seq. Should make sense if you
check out those references.
Hth, Adrian.
On Sun, Aug 9, 2009 at 5:41 PM, Rob<rob.nikan...@gmail.com> wrote:
>
> Hi all,
>
> I'm trying to understand the next vs rest functions. I don't see why
> you want/need both. Is it because null is in the picture? It seems
> like the interface to a good old lisp list is 3 functions (car/first/
> head, cdr/rest/tail, null?/empty?). I can imagine making this into an
> abstract immutable sequence with a java interface like:
>
> public interface FunctionalListyThing
> {
> Object first();
> FunctionalListyThing rest();
> boolean isEmpty();
> }
>
> Why does one need the 4th method, "next()" ?
>
> thanks,
> Rob
>
> >
>
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