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並前往https://andersmurphy.com/2020/12/27/clojure-cond-deep-merge-remove-nils-and-the-shape-of-data.html

Clojure: cond->, deep-merge, remove-nils and the shape of data

(defn remove-nils [m] (clojure.walk/postwalk (fn [x] (if (map? x) (->> (keep (fn [[k v]] (when (nil? v) k)) x) (apply dissoc x)) x)) m)).

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