This is interesting. We can get quite a huge performance boos by type hinting that impl.
Times on my system running Clojure 1.4.0: user=> (defn s-blank? [s] (every? #(Character/isWhitespace %) s)) user=> (time (dotimes [n 20000] (s-blank? "asdf"))) "Elapsed time: 247.252 msecs" Now if we type hint s-blank, here's what I get: (defn s-blank? [^CharSequence s] (every? (fn [^Character c] (Character/isWhitespace c)) s)) user=> (time (dotimes [n 20000] (s-blank? "asdf"))) "Elapsed time: 9.122 msecs" Not bad :) Especially when compared to clojure's blank? : user=> (time (dotimes [n 20000] (clojure.string/blank? "asdf"))) "Elapsed time: 2.62 msecs" Is it still slower? Absolutely! But we didn't have to give up the functional approach to boost performance - a little type hinting in this case provided a huge benefit. On Wednesday, January 16, 2013 7:35:07 AM UTC+11, Thomas wrote: > > I think I just answered my own question... > > user=> (time (dotimes [n 20000] (s-blank? "asdf"))) > "Elapsed time: 2481.018 msecs" > nil > user=> (time (dotimes [n 20000] (blank? "asdf"))) > "Elapsed time: 14.347 msecs" > nil > user=> > > Quite a difference I have to say. > > Thomas > -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
