I'm pretty sure there has to be a more idiomatic way of writing this:

(defn update-2nd-level-vector
  [map index value]
  (assoc map :key1 (assoc (get map :key1) :key2 (-> map (get-in [:key1 :key2]) (assoc index value)))))

Example of its working:

=> (update-2nd-level-vector {:key1 {:key2 [0 1]}} 0 1)
{:key1 {:key2 [1 1]}}
  • You can use update-in.
    – Jeremy
    Jul 26, 2014 at 16:49

1 Answer 1


you must use update-in..also your function is not enough flexible, you're restricted to use it only in maps with those keys..

this is a bit more practical

(defn update-level [keyspos mapp index value]
  (assoc-in mapp keyspos (assoc (get-in mapp keyspos) index value)))

you can use it

(update-level [:key1 :key2] {:key1 {:key2 [0 1]}}  0 3)

or similar to your function

(def update-2nd-level-vector2  (partial update-level [:key1 :key2]))

(update-2nd-level-vector2 {:key1 {:key2 [0 1]}} 0 3)
  • Thanks. The function is just an example, I'm not using that exact function.
    – m0skit0
    Apr 5, 2015 at 15:30

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