                <pre><h6><i><a href="https://github.com/zcaudate/hara/blob/master/test/hara/state/ova_test.clj#L202-L210" target="_blank">link</a></i></h6><code class="clojure">(-> (ova [{:id :1} {:id :2}])
    (map-indexed! (fn [i m]
                    (assoc m :val i)))
    (<<))
=> [{:val 0, :id :1}
    {:val 1, :id :2}]</code></pre>
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