Hi,
On Feb 16, 9:55 am, Stuart Halloway <[email protected]> wrote:
> map is lazy, count and butlast are not lazy. Does adding a doall
> around your call to map fix this problem?
Argh. butlast is only unlazy of degree one, so to say.
Is there a reason why not to provide a lazy version:
(defn butlast
"Return a seq of all but the last item in coll."
[coll]
(lazy-seq
(let [s (seq coll)]
(when-let [r (next s)]
(cons (first s) (butlast r))))))
I see, that butlast is used in the bootstraping early on. But can't
there be a bootstrap version, which does not need the whole machinery,
and a "production" butlast providing laziness? Or is it not worth the
trouble?
Sincerely
Meikel
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