https://github.com/zcaudate/hara/blob/master/test/hara/state/ova_test.clj#L130-L170" target="_blank">link</a></i></h6><code class="clojure">(def o (ova [{:id :1 :val 1} {:id :2 :val 1}
             {:id :3 :val 2} {:id :4 :val 2}]))

(select o)              ;; no filters
=> #{{:id :1, :val 1}
     {:id :2, :val 1}
     {:id :3, :val 2}
     {:id :4, :val 2}}

(select o 0)            ;; by index
=> #{{:id :1 :val 1}}

(select o #{1 2})       ;; by indices
=> #{{:id :2 :val 1}
     {:id :3 :val 2}}

(select o