re><h6><i><a href="https://github.com/zcaudate/hara/blob/master/test/hara/state/ova_test.clj#L213-L225" target="_blank">link</a></i></h6><code class="clojure">(-> (ova [{:id :1 :val 1}
          {:id :2 :val 1}
          {:id :3 :val 2}
          {:id :4 :val 2}])
    (smap! [:val 1]
           update-in [:val] #(+ % 100))
    (<<))
=> [{:id :1, :val 101}
    {:id :2, :val 101}
    {:id :3, :val 2}
    {:id :4, :val 2}]</code></pre>
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