Hi,

maybe using group-by works?

(defn custom-merge
  [maps]
  (->> maps
    (apply concat)
    (group-by :id)
    (sort-by key)
    (map (comp first val))))

I'm not sure about the efficiency, though. If you don't need the result sorted 
by :id you might replace the sort and the map by “vals (map first)”.

Sincerely
Meikel

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