On Mar 11, 2013, at 17:09 , Ryan <arekand...@gmail.com> wrote:
> What if, i had two clojure lists, with hash-maps which have the same keys and
> based on a specific key, i wanted to find the items from list-a which do not
> exist in list-b. Would i go with the two functions you suggested or is there
> something else I could use?
Assuming :id is the key you care about:
(filter (comp (complement (set (map :id list-b))) :id)
list-a)
user=> (defn rand-seq [n] (repeatedly #(rand-int n)))
#'user/rand-seq
user=> (def list-a (map (partial hash-map :id) (take 5 (rand-seq 10))))
#'user/list-a
user=> list-a
({:id 8} {:id 4} {:id 5} {:id 1} {:id 6})
user=> (def list-b (map (partial hash-map :id) (take 5 (rand-seq 10))))
#'user/list-b
user=> list-b
({:id 9} {:id 6} {:id 3} {:id 6} {:id 3})
user=> (filter (comp (complement (set (map :id list-b))) :id) list-a)
({:id 8} {:id 4} {:id 5} {:id 1})
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