> I'd say that Racket has the best one I've used. I love that you can specify a '_' for the hole which the result from the previous operation will fill. Clojur

> I'd say that Racket has the best one I've used. I love that you can specify a '_' for the hole which the result from the previous operation will fill. Clojure also has a placeholder variant, the as-> form. Quoting the example the Clojure doc page (https://clojure.org/guides/threading_macros https://clojure.org/guides/threading_macros): (as-> [:foo :bar] v (map name v) (first v) (.substring v 1)) ;; => "oo"