1 files changed, 8 insertions, 9 deletions

diff --git a/beamer/viewer/presentation.js b/beamer/viewer/presentation.js
index fd03288..753027b 100644
--- a/beamer/viewer/presentation.js
+++ b/beamer/viewer/presentation.js
@@ -30,11 +30,11 @@ class Presentation {
   }
 
   _setupStage() {
-    const self = this;
-    const onStageReadyCallback = function() { self._onStageReady(); };
-    const onNextCallback = function() { self._onNext(); };
-    const onPreviousCallback = function() { self._onPrevious(); };
-    return new Stage(onStageReadyCallback, onNextCallback, onPreviousCallback);
+    return new Stage(
+      () => this._onStageReady(),
+      () => this._onNext(),
+      () => this._onPrevious(),
+    );
   }
 
   _onStageReady() {
@@ -52,10 +52,9 @@ class Presentation {
   }
 
   _setPage(pageIndex) {
-    const self = this;
     this.currentPageIndex = pageIndex;
-    this.pdf.getPage(this.currentPageIndex).then(function(page) {
-      self.stage.setPage(page);
-    })
+    this.pdf
+      .getPage(this.currentPageIndex)
+      .then(page => this.stage.setPage(page))
   }
 }