All functions returned by a given arity of partial or comp are of the same Java class under the hood, whereas defining an anonymous function always generates a new class, and I've heard that fewer classes can result in better performance from a JIT perspective. But I'm just speculating and haven't actually run the benchmarks. So, [citation needed].
>From a more practical perspective: I always prefer to give my anonymous functions names (e.g. `(fn foo [x])`, not `(fn [x])`), so that the stack traces are a bit more self-explanatory, but partial and comp don't let you do that. Although sometimes the added readability of a higher-order function outweighs that concern. On Sun, Oct 20, 2019 at 2:55 PM John D. Hume <duelin.mark...@gmail.com> wrote: > It's been a long time since I looked at this, but as of a few years ago, > the biggest noticeable performance detriment of comp or partial was likely > to come if you pass enough args to hit a "& args" overload, which requires > creating a fresh object array at each call, when the underlying function > being called has a non-"& args" arity. > > On one application I worked on, we preferred defining #(anonymous ...) > functions to some uses of higher order functions to avoid excessive > garbage-creation in some hot spots. > > This assumes you don't need primitive type-hint-level optimization. > > I wouldn't recommend sacrificing any clarity unless you've profiled and > found a real issue. > > definition of partial: > > https://github.com/clojure/clojure/blob/master/src/clj/clojure/core.clj#L2614 > > definition of comp: > > https://github.com/clojure/clojure/blob/master/src/clj/clojure/core.clj#L2557 > > > On Sun, Oct 20, 2019, 3:25 PM david hoyt <davidpaulh...@gmail.com> wrote: > >> Is there a performance benefit (or detriment) to creating partial >> functions? Other than the potential reduction of complexity, is there a >> difference between using partial & comp and defining new functions? >> >> -- >> 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 >> --- >> You received this message because you are subscribed to the Google Groups >> "Clojure" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to clojure+unsubscr...@googlegroups.com. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/clojure/146f2a73-9887-4eba-89c6-815eed6841b1%40googlegroups.com >> . >> > -- > 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 > --- > You received this message because you are subscribed to the Google Groups > "Clojure" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to clojure+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/clojure/CAKK7-VLE_TPdjBuf6g8n0hVLaiMeibS63wJ8UqGDKD1qGZ4T2A%40mail.gmail.com > <https://groups.google.com/d/msgid/clojure/CAKK7-VLE_TPdjBuf6g8n0hVLaiMeibS63wJ8UqGDKD1qGZ4T2A%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > -- 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 --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/clojure/CAMvaFAXa6Qhch%2B%2B-OCTVz399GCAiHJxxNM6VM%3Dak3hjVzkB1gw%40mail.gmail.com.
