Returns a map that consists of the rest of the maps conj-ed onto the first. If a key occurs in more than one map, the mapping(s) from the latter (left-to-right) will be combined with the mapping in the result by calling (f val-in-result val-in-latter).
; clojure/core.clj:1643 (defn merge-with [f & maps] (when (some identity maps) (let [merge-entry (fn [m e] (let [k (key e) v (val e)] (if (contains? m k) (assoc m k (f (m k) v)) (assoc m k v)))) merge2 (fn [m1 m2] (reduce merge-entry (or m1 {}) (seq m2)))] (reduce merge2 maps))))
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