Question

Let’s say I have

(defn test [ & {:keys [a b c]}]
   (println a)
   (println b)
   (println c))

What I want is to call test with a map {:a 1 :b 2 :c 3}.

This works:

(apply test [:a 1 :b 2 :c 3])

These do not:

(apply test {:a 1 :b 2 :c 3})
(apply test (seq {:a 1 :b 2 :c 3}))

EDIT
So you can of course define the function like this also:

(defn test [{:keys [a b c]}] ; No & 
  (println a)
  (println b)
  (println c))

And then you can pass a map to it:

(test {:a 1 :b 2 :c 3})
1
2
3

When learning clojure I had missed this was possible. Nevertheless if you ever come across a function defined by me or somebody like me then knowing how to pass a map to it could still be useful 😉

Answer 1

user> (apply list (mapcat seq {:a 1 :b [2 3 4]}))
(:a 1 :b [2 3 4])