Update multiple elements of a Clojure atom within a single swap statement? -


i have atom has 2 parts it.

(def thing (atom {:queue '() :map {}}))

i want update both :queue , :map in 1 atomic stroke, prevent them getting off-sync.

queue individually:

(swap! thing update-in [:queue] (list 1))

(from question: how append nested list in clojure atom?)

map individually:

(swap! thing assoc-in [:map 1] (:key :value))

(from question: using swap merge (append to) nested map in clojure atom?)

how can these both within single swap statement? (assuming prevent them getting off-sync?)

you have 1 change want make, right? , write change pure function? need write function, , pass argument swap!.

(defn take-from-queue [{q :queue, m :map}]   {:queue (rest q), :map m (assoc m :new-task (first q))})  (swap! thing take-from-queue)

where of course have no idea want body of function do, i've made doesn't throw exception.


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