This was my first thought (quite close to Jim's): (def the-maps [{:key 3 :value 30} {:key 4 :value 40}])
(def mandatory-keys [1 2 3 4 5]) (defn find-missing-keys [maps keys] (let [found (into #{} (map :key maps))] (remove #(contains? found %) keys))) (defn ensure-mandatory-keys [maps] (let [missing (find-missing-keys maps mandatory-keys)] (sort-by :key (reduce (fn [result key] (conj result {:key key :value nil})) maps missing)))) (ensure-mandatory-keys the-maps) ;; ({:key 1, :value nil} ;; {:key 2, :value nil} ;; {:key 3, :value 30} ;; {:key 4, :value 40} ;; {:key 5, :value nil}) - John -- -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.