As a test, I replaced the mapcat with a plain map in the slow version: (defn collapse-slow [col pred rep] (let [f (fn [[x & more :as xs]] (if (pred x) [rep] xs))] (map f (partition-by #(if (pred %) true) col))))
Is that the concat you were thinking of? Ignoring that the functions aren't equivalent anymore, it's only a 10-20% boost. (Let me know if I misinterpreted your suggestion.) -- 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