Question

I’ve a code like this. I can run this in repl but can’t from command line.
I guess i’ve a lazy evaluation problem.

; items.clj

(def items (ref []))

(defn init-items []
  (map
    #(dosync
       (alter items conj %))
    ["foo" "bar" "baz" ] ))

(init-items)
(println (first @items))

$ java -jar clojure.jar items.clj
$ nil

Regards.

Answer 1

Got it!

solution

Clojure is not motivated to run the map function in init-items because there’s no result returned. I wrapped that into a doall to force execution, and presto.