Should Reagent re-render after clicking the button in this snippet?

[reagent-project]

Should Reagent re-render after clicking the button in this snippet?

[mainej]

I think reagent wants components to be functions, so that it can re-evaluate them when atoms change:

(def show? (atom true))

(defn show-div []
  [:div (str @show?)
   [:button {:on-click
             (fn [e] (swap! show? not))}
    "swap"]])

(defn ^:export run []
  (reagent/render-component
    [show-div]
    (.-body js/document)))