A slightly cleaner version:
(defn- flatten-keys* [a ks m]
(cond
;; Is a map?
(map? m) (reduce into
(map (fn [[k v]]
(flatten-keys* a (str ks "." (name k)) v))
(seq m)))
;; Is an arr/vec/seq?
(and (sequential? m)
(not (instance? clojure.lang.MapEntry m))) (reduce into
(map-indexed (fn
[idx itm]
(flatten-keys* a
(str ks "[" idx "]")
itm))
(seq
m)))
;; Is not a collection
:else (assoc a ks m)))
(defn flatten-keys [m] (flatten-keys* {} "$" m))
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