Maybe this?
user> (defn ensure-mandatory
" coll - keys of required maps
maps - collection of maps"
[coll maps]
(loop [adding (clojure.set/difference
(set coll)
(->> maps (map keys) flatten set))
all maps]
(if-let [k (first adding)]
(recur
(rest adding)
(conj all (hash-map k nil)))
all)))
'user/ensure-mandatory#
user> (def my-map
[{:3 true}
{:4 true}
{"c" :c-value}
{"d" :d-value}])
'user/my-map#
user> (def mandatory [:1 "2" "c"])
'user/mandatory#
user> (ensure-mandatory mandatory my-map)
[{:3 true} {:4 true} {"c" :c-value} {"d" :d-value} {:1 nil} {"2" nil}]
20.11.2013, 11:33, "John Mastro" <john.b.mas...@gmail.com>:
> 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
>
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