Re: your [1], Clojure's threading macros came to mind first for me as well. (->> [(range 20 31) (range 490 501) (range 8120 8131)] (apply conc

Re: your [1], Clojure's threading macros came to mind first for me as well. (->> [(range 20 31) (range 490 501) (range 8120 8131)] (apply concat) (map classify) (reduce getCounts [0 0 0])) Expands as follows: user> (macroexpand '(->> [(range 20 31) (range 490 501) (range 8120 8131)] (apply concat) (map classify) (reduce getCounts [0 0 0]))) (reduce getCounts [0 0 0] (map classify (apply concat [(range 20 31) (range 490 501) (range 8120 8131)]))) Now that you mention concurrency and flow-control in the context of these macros, it seems a little weird to me that we have "threading macros" that really are about weaving expressions together rather than concurrency/threading.