[harryposner]

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