Consider this contrived piece of code:
(def aval (atom {:dumped false :contents "hello world"}))
(defn update!
[item]
(when-not (:dumped item)
(spit "a.out" (:contents item) :append true)
(assoc item :dumped true)))
How should I correctly call update! ? Each of following two calls have
drawbacks.
(swap! aval update!) ;; update! can be called more than once
(let [new-val (update! aval)]
;; aval can be changed in between from other thread
(reset! aval new-val))
Best,
Jozef
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