# vector-map

{{tag>clojure fnil}}

<code clojure>
(defn ->vector-map [m [k v]]
   (update m k (fnil conj []) v))

(->vector-map {} [:k 1])
;;=> {:k [1]}

(->vector-map {:k [1]} [:k 2])
;;=> {:k [1 2]}
</code>