Digital Digressions by Stuart Sierra
From programming to everything else
A brief addendum to my last post about Clojure’s threading macros. As I was saying … I said you could use as-> to work around the placement of an argument that doesn’t quite fit into a larger pattern of ->. My example was: (-> results :matches (as-> matches (filter winning-match? matches)) (nth 3) :scores (get…
No, not multi-threading. I’m talking about Clojure’s threading macros, better known as “the arrows.” The -> (“thread-first”) and ->> (“thread-last”) macros are small but significant innovations in Clojure’s Lisp-like syntax. They support a functional style of programming with return values and make composition intuitive. They answer the two chief complaints about Lisp syntax: too many…