On Mon, Jun 25, 2012 at 12:31 AM, Christian M. <chrm...@gmail.com> wrote:
> I have developed a tiny web app in Clojure/ClojureScript and have written > an overview here <http://notehub.org/2012/6/16/how-notehub-is-built>. In > general, it was an exciting experience, but I also faced several problems > with ClojureScript. For example, if you compile your code to JS, then the > output file (in contrast to CoffeeScript) will contain other code (~18kb or > so): this code contains the Google Closure libraries, which do a lot of > stuff, like accessing the DOM elements. The bulk of the "other" code is the CLJS standard lib. We currently only use a few things from GClosure (string, object, array, etc), nothing involving the DOM. > Furthermore, I did experience some performance problems with > ClojureScript, which I didn't investigate further, so I'm not sure, that > these problems hold in general. I did some per-character computations on a > very large text and it took just too long for such a primitive operation. > Since my code was quite high-level I assumed, that the GC of JS engine was > choked. > If you want fast string manipulating, writing very high-level code isn't going to work. Same for hand written JavaScript. > I think the only problem (if it is a problem at all), which won't be > solved soon is ClojureScript's performance resulting from creating a lot of > implicit objects in very high level computations. Something like (filter > (map (reduce ... ... (map ...)))) can't be as fast and as memory-efficient > for loops and in-place array operations of JS. In theory, the same holds > for Clojure and Java as well, however, in contrast to ClojureScript, I > never faced this problem on JVM yet. > There's lots of room for improving the performance of the high level operations. That said generating fast JS from CLJS is a goal - otherwise the data structure benchmarks would not look as good as they currently do. I admit as with Clojure on JVM - it's not obvious how to write fast code - even though it's not difficult. A guide on how to write fast code for critical parts of CLJS application needs to be written up by someone. David -- 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
