1 files changed, 13 insertions, 16 deletions

diff --git a/beamer/viewer/stage/stage.js b/beamer/viewer/stage/stage.js
index 3f1a5f5..4882c31 100644
--- a/beamer/viewer/stage/stage.js
+++ b/beamer/viewer/stage/stage.js
@@ -36,12 +36,11 @@ class Stage {
     if (this.projector == null)
       alert("Please allow pop-ups, then refresh this page.");
 
-    const self = this;
-    this.projector.addEventListener("load", function() {
-      self.audienceScreen = new Screen(self.projector, false, false);
-      self.presenterScreen = new Screen(window, true, true);
-      self._watchDetach();
-      self.onReady();
+    this.projector.addEventListener("load", () => {
+      this.audienceScreen = new Screen(this.projector, false, false);
+      this.presenterScreen = new Screen(window, true, true);
+      this._watchDetach();
+      this.onReady();
     });
 
     this._registerEventHandler(window);
@@ -56,20 +55,18 @@ class Stage {
   _registerEventHandler(window) {
     if (window == null) return;
 
-    this.eventHandlers.forEach(function(eventHandler) {
-      eventHandler.register(window);
-    });
+    this.eventHandlers
+      .forEach(eventHandler => eventHandler.register(window));
   }
 
   _watchDetach() {
-    const self = this;
-    window.addEventListener("beforeunload", function() {
-      self._setMessage(self.projector, "Controller detached");
-    });
+    window.addEventListener("beforeunload", () =>
+      this._setMessage(this.projector, "Controller detached")
+    );
 
-    this.projector.addEventListener("beforeunload", function() {
-      self._setMessage(window, "Viewer detached");
-    });
+    this.projector.addEventListener("beforeunload", () =>
+      this._setMessage(window, "Viewer detached")
+    );
   }
 
   _setMessage(window, message) {