On 31 Jan., 02:44, Daniel Renfer <[email protected]> wrote:
> user=> (take 0 (lazy-cat [(println 10)] [(println 20)]))
> 10
> nil
>
> What you see here is not an issue with lazy-cat, but rather an issue
> with take. The current implementation of take evaluates one more than
> the n passed to it.
I don’t think so:
(defn take
"Returns a lazy seq of the first n items in coll, or all items if
there are fewer than n."
[n coll]
(when (and (pos? n) (seq coll))
(lazy-cons (first coll) (when (> n 1) (take (dec n) (rest
coll))))))
As we can see (pos? n) is the first thing TAKE does.
As (pos? 0) ==> false the execution of take ends right here.
The (seq coll) is never reached.
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