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I’m learning clojure on Heroku using this tutorial. I’ve come across the same thing in other tutorials, as well.
Anyway, using the jetty adapter in ring, you have something like this:
(defroutes routes
...)
(defn start []
(ring/run-jetty #'routes {:port 8080 :join? false}))
I don’t understand what #'routes means. If I replace it with just routes it seems to work fine. What does the #'symbol notation mean? It’s been very difficult to research.
It’s a reader macro.
#'fooexpands to(var foo). See Is pound-quote (hash-quote, #') in Clojure running the resolve and symbol functions?, Difference between Symbols and Vars in Clojure and http://clojure.org/vars where you can find in-depth discussion.