How to replace nested values in Clojure

(defn replace-values [data target-key new-value] (clojure.walk/postwalk (fn [x] (cond (map? x) (into {} (map (fn [[k v]] [k (if (= k target-key) new-value v)])) x) (vector? x) (vec (map #(replace-values % target-key new-value) x)) :else x)) data)) 

(def data {:cart {:something 0 :fruit {:apples 1 :bananas 2 :something 1}} :vegetables [{:eggplants 10 :potatoes 3 :something 0}]}) (replace-values data :something 42) ;; => {:cart {:something 42, :fruit {:apples 1, :bananas 2, :something 42}}, :vegetables [{:eggplants 10, :potatoes 3, :something 42}]}