ClojureScript function to show a Bootstrap dropdown.

actions.cljs

(defn actions [array-of-funcs]
    (doseq [func array-of-funcs] (func)))

dropdown-impure.cljs

(defn show-dropdown [e]
    (this-as button
        (let [$button (js/$ button)]
            (.preventDefault e)
            (remove-dropdown)
            (.addClass (.parents $button ".dropdown") "open"))))

dropdown-pure.cljs

(defn show-dropdown [e]
    (this-as button
        (let [$button (js/$ button)]
            (actions
                (array (fn [] (.preventDefault e))
                       (fn [] (remove-dropdown))
                       (fn [] (.addClass (.parents $button ".dropdown") "open")))))))