Hi Austin,
Since there is no way to know the length of a lazy-seq without realizing
it, I think your only choice is to set a limit on it by binding
*print-length* if you are not sure about the sequence.
Other thing you can try is bounded-count like this :
(defn looks-finite? [xs]
(let [limit 1000]
(< (bounded-count limit xs) limit)))
(looks-finite? (map inc (range))) ;; => false
(looks-finite? (map inc (range 100))) ;; => true
I hope that helps.
Juan
El domingo, 1 de noviembre de 2020 a las 20:06:39 UTC-3, Austin Haas
escribió:
>
> How can I make sure that a logging function won't try to realize an
> infinite lazy seq that could be anywhere in the arguments passed to the
> logging function?
>
> Is there some way to guarantee that lazy seqs won't be realized when
> converting to a string?
>
> I know I can bind *print-length*, but I don't want to constrain every
> collection.
>
> And I know that lazy seqs aren't always realized, but that doesn't seem to
> help if they are infinite:
>
> user=> (str (map inc (range 10)))
> "clojure.lang.LazySeq@c5d38b66"
>
> user=> (str (map inc (range)))
> <never ends>
>
> Thanks.
>
>
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