error-handling - Clojurescript/试剂处理错误

Question

我们开始在产品的下一个开发阶段中使用Clojuescript/Reagent。基本上，我们需要一种方法来对原子执行单个操作，然后我们想到了一种方法:
(def应用程序状态(r/atom {}))

(defn select [index]
    (swap! app-state
       #(-> %
            (assoc-in [:storyboard :pages 0 :layers 0 :children 0 :is_selected] true)
            (assoc-in (GET ....)) ;; ajax call
            (assoc-in [:selected :selected_tab] "tab_properties")
            (assoc-in [:selected :page_object_cursor] [0])
         )))

基本上，交换具有将所有需要的操作链接在一起的功能。太好了但是，我正在寻找处理错误的方法。我想为错误提供一个单独的原子:

(def errors (r/atom []))

并在发生错误时捕获它并将其添加到错误中，而无需交换应用程序状态(应用程序保持在最后的稳定状态)。因此，我们使用链条上的 throw 和尝试仙人掌

(defn change-title [title]
  (try
    (swap! app-state
       #(-> %
            (assoc :text title)
            ((fn [state] 
               (throw "there is an error")))
            ))
    (catch js/Object e
      (swap! errors conj e))))

所以我希望错误会被捕获，而@errors会得到它。但是现实是:

*未捕获到错误

weather_app $ core $ change_title @ core.cljs？rel = 1450266738018:59(匿名函数)@ core.cljs？rel = 1450266738018:108executeDispatch @ react-with-addons.inc.js:3311SimpleEventPlugin.executeDispatch @ react-with-addons。 inc.js:17428forEachEventDispatch @ react-with-addons.inc.js:3299executeDispatchesInOrder @ react-with-addons.inc.js:3320executeDispatchesAndRelease @ react-with-addons.inc.js:2693forEachAccumulated @ react-with-addons.inc。 js:19430EventPluginHub.processEventQueue @ react-with-addons.inc.js:2900runEventQueueInBatch @ react-with-addons.inc.js:11217ReactEventEmitterMixin.handleTopLevel @ react-with-addons.inc.js:11243handleTopLevelImpl @ react-with-addons。 inc.js:11329Mixin.perform @ react-with-addons.inc.js:18402ReactDefaultBatchingStrategy.batchedUpdates @ react-with-addons.inc.js:9669batchedUpdates @ react-with-addons.inc.js:16633ReactEventListener.dispatchEvent @ react- with-addons.inc.js:11423 *

Answer 1

(catch :default e
  (swap! errors conj e))))

因为抛出的字符串不是对象，而是字符串!