On Jun 15, 4:58 am, Wrexsoul <d2387...@bsnow.net> wrote:
> Eh. That didn't occur to me. It could be combined with the meta-nil
> trick, too:
>
> (defn custom-lazy-seq [genfn]
> (map #(first %)
> (take-while (complement nil?)
> (repeatedly genfn))))
>
> where the genfn returns nil for no-next-item and [item] otherwise.
You could also define an explicit end-of-stream object:
(def end-of-stream (Object.))
(defn custom-lazy-seq [genfn]
(take-while #(not= end-of-stream %)
(repeatedly genfn)))
> The loop/recur style of super-lazy0-seq use seems "closer to
> functional purity" than does an explicitly stateful genfn.
Well, coming from a Haskell background I'd consider using higher-level
functions to be closer to functional purity, but each to their own.
- James
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