I want to flatten a map of nested maps/vecs
Currently I'm using the fn's:
(defn- flatten-keys* [a ks m]
(cond
(map? m) (reduce into
(map (fn [[k v]]
(flatten-keys* a (if-not (empty? ks)
(str ks "." (name k))
(str "$." (name k))) v)) (seq m)))
(and (sequential? m)
(not (instance? clojure.lang.MapEntry m))) (reduce into
(map-indexed (fn
[idx itm]
(flatten-keys* a
(str ks "[" idx "]")
itm))
(seq
m)))
:else (assoc a ks m)))
(defn flatten-keys [m] (flatten-keys* {} "" m))
(flatten-keys {:name {:first "Rich" :last "Hickey"} :number [1 415 123 4567]})
;; => {"$.number[0]" 1, "$.number[1]" 415, "$.number[2]" 123, "$.number[3]"
4567, "$.name.first" "Rich", "$.name.last" "Hickey"}
However, I was wondering if anyone had suggestions on a more performant fn?
I have a white-list of possible flattened keys. But, the list is big
(~1200), and with with most (~95%) of the keys having corresponding vals =
nil it was much less performant using get-in on every possible key.
Thanks for the help!
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