Clojure: convert a map with keyword keys to one with equivalent string keys

Question

I have a map like {:a "A" :b "B"} and want to convert its keys to strings, e.g. {"a" "A" "b" "B"}.

I have this function, which works:

(defn keyword-keys->strs [m]
  (zipmap
    (map name (keys m))
    (map second (vec m))))

But is there a more idiomatic or purpose-built way to do it?

Thanks!

simply (reduce-kv (fn [acc k v] (assoc acc (str k) v)) {} data) — leetwinski
– leetwinski, Commented Mar 11, 2019 at 10:36
@cfrick thanks for the tip, that was another one I had a hard time googling — acobster
– acobster, Commented Mar 11, 2019 at 14:47

Taylor Wood · Accepted Answer · 2019-03-11 09:28:09Z

11

There's a built-in function that will recursively convert map keys to strings:

(clojure.walk/stringify-keys {:a "A" :b "B"})
=> {"a" "A", "b" "B"}
(clojure.walk/stringify-keys {:a "A" :b {:c "C"}})
=> {"a" "A", "b" {"c" "C"}}

answered Mar 11, 2019 at 9:28

Taylor Wood

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2 Comments

ah, clojure.walk, of course! I should have looked there.

And don't forget the (more common) keywordize-keys: clojuredocs.org/clojure.walk/keywordize-keys