Clojurescript core-async: Async condition inside go

Question

I have a problem with ClojureScript Core-Async . This only happens in ClojureScript and not in Clojure.

I have the following code:

(defn cc [x]
  (go 
    (println "cc: " x)
    x))

(defn foo [x]
  (go
    (when (and (= :ok (<! (cc x)))
               (= :ok (<! (cc :ok))))
      (print "after and"))))

(foo 1)
(foo :ok)

When calling (foo :ok), the result is as expected - the function cc is called twice, and the console shows cc: :ok cc: :ok after and. But, when running (foo 1), the function cc is also run twice and the console shows cc: 1 cc: :ok. So, even though the first condition isn't fullfilled, the second one is still checked!

This sounds like a bug, not a question; I suggest you report a github issue for the project and report the version number. — Timothy Pratley
– Timothy Pratley, Commented Jan 26, 2016 at 19:35
@TimothyPratley you are right. This is a bug. I opened a Jira issue for it: dev.clojure.org/jira/browse/ASYNC-158 — Asher
– Asher, Commented Jan 27, 2016 at 6:37

Vincent Cantin · Accepted Answer · 2021-08-01 15:44:02Z

1

This is apparently a bug with the ClojureScript core.async library. I opened a Jira issue for this.

In the meantime I was able to work around this by using:

(go
  (when (= :ok (<! (cc x))
    (when (= :ok (<! (cc :ok)))
      (print "after and")))))

edited Aug 1, 2021 at 15:44

Vincent Cantin

17.5k2 gold badges37 silver badges58 bronze badges

answered Jan 27, 2016 at 6:55

Asher

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