HAharryposner·Jun 14, 2026
Clojure has two options:
The version with a threading macro, will create a lazy-sequence for each step in the pipeline. It will not instantiate the entire list, so it's O(1) memory overhead in terms of peak memory, but it churns O(N) extra garbage.
(->> things
(map model/find-thing)
(filter some?))
And the version with transducers, which will not create any intermediate sequences:
(sequence (comp (map model/find-thing)
(filter some?))
things)
It looks like there's a Common Lisp transducers library, but I have no idea how widely it's used.
https://github.com/fosskers/transducers
In Lisp's Influence on Ruby