Oh, right! Example with println clears it. I should gave it some more thought from the how-it-works-internally perspective! Guess I just was blown away by the expressiveness of the syntax which makes everything look so simple and straightforward and sync-like :)
Thanks, Timothy! :) On 23 April 2014 20:53, Timothy Baldridge <tbaldri...@gmail.com> wrote: > What you want is not possible since core.async does not do full program > rewriting, only code within a go is transformed. This is for both > performance and practical reasons. > > So yes, wrapping a go in a go may seem a bit pointless, but that's exactly > the semantic that you want, in a single threaded environment like JS VMs it > is also the only possible solution. > > If you think about it, the semantics of what you are asking for is not > possible. For how would you pause the execution of the (println) until the > async evaluation of its arguments had completed? > > Timothy > > > > > On Wed, Apr 23, 2014 at 3:56 AM, Dmitry Suzdalev <dim...@gmail.com> wrote: > >> Hello! >> >> I was interested in trying to wrap some callback-hellish JS async >> functionality into something that would look (and work) like a sync call. >> I thought that it could be some kind of function which internally uses >> core.async but does not expose this. >> >> That is instead of having some function with callback on completion >> >> (.findSomething jsLib (fn [res] (println res))) >> >> I would like to have a sync-variant of it, something like this >> >> (defn findSomething [] >> "returns res" >> (let [c (chan)] >> (go (!< (.findSomething jsLib (fn [res] (put! c res))))))) >> >> (println (findSomething)) ;; => prints "res" value >> >> It would work if go-macro returned last *value* read from the channel. >> But go macro returns a *channel* that contains the result. So to read it in >> clojurescript I have to ironically wrap go in go again. >> Seems like when you started using channels there's no way out of this :) >> On JVM I could just use <!! in this situation, but it is not supported >> in ClojureScript. >> >> Wanted some advice/pointers from experienced programmers as I've just >> started and might get something completely wrong :) >> Thanks in advance, >> Dmitry. >> >> -- >> 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. >> For more options, visit https://groups.google.com/d/optout. >> > > > > -- > “One of the main causes of the fall of the Roman Empire was that–lacking > zero–they had no way to indicate successful termination of their C > programs.” > (Robert Firth) > > -- > 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. > For more options, visit https://groups.google.com/d/optout. > -- 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. For more options, visit https://groups.google.com/d/optout.
