It's what I had imagined. So is it fair to say that what is idomatic in Clojure may not be idiomatic in ClojureScript?
The negligible advantage it offers in ClojureScript does not justify losing the functionality of the atom IMO but I may be wrong Sent from my iPhone > On Jun 22, 2015, at 1:31 PM, Francis Avila <fav...@breezeehr.com> wrote: > >> On Monday, June 22, 2015 at 2:45:19 PM UTC-5, marc fawzi wrote: >> Idioms aside, what is the material benefit of using volatile over a locally >> scoped atom? I googled a bit and it seems that it has less concurrency >> guarantees and thus less overhead in Clojure but for ClojureScript is it >> really any lighter than an atom? >> >> Sent from my iPhone > > In ClojureScript the performance difference is probably marginal. (In Clojure > the difference is more pronounced.) > > Concretely, the Volatile object has only one property (state) instead of the > Atom's four (state, metadata, validator function, and watchers) and the > vswap! and vreset! macro and function do not have any conditionals for > validation or watcher notification. Notice this means volatiles do not > support metadata, validators, or watchers. > > In most situations the advanced-compiled output for vreset! is an inline > property set (e.g. my_volatile.state = newval), i.e. the function call is > eliminated. This is less likely for an atom's reset! because the compiler may > not be able to eliminate the validation and watcher notification code. > However this is unlikely to make any difference in real-world usage. > > Volatiles are as close as one can get to a platform-native mutable local > variable in clojure and clojurescript right now. > > -- > Note that posts from new members are moderated - please be patient with your > first post. > --- > You received this message because you are subscribed to the Google Groups > "ClojureScript" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to clojurescript+unsubscr...@googlegroups.com. > To post to this group, send email to clojurescript@googlegroups.com. > Visit this group at http://groups.google.com/group/clojurescript. -- Note that posts from new members are moderated - please be patient with your first post. --- You received this message because you are subscribed to the Google Groups "ClojureScript" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojurescript+unsubscr...@googlegroups.com. To post to this group, send email to clojurescript@googlegroups.com. Visit this group at http://groups.google.com/group/clojurescript.
