diff --git a/lib/browser/api/dialog.js b/lib/browser/api/dialog.js
index 6669d8cab8..a41d1fa46e 100644
--- a/lib/browser/api/dialog.js
+++ b/lib/browser/api/dialog.js
@@ -21,22 +21,20 @@ var messageBoxOptions = {
 }
 
 var parseArgs = function (window, options, callback, ...args) {
-  if (!(window === null || (window != null ? window.constructor : void 0) === BrowserWindow)) {
+  if (window !== null && window.constructor !== BrowserWindow) {
     // Shift.
-    callback = options
-    options = window
-    window = null
+    [callback, options, window] = [options, window, null]
   }
 
   if ((callback == null) && typeof options === 'function') {
     // Shift.
-    callback = options
-    options = null
+    [callback, options] = [options, null]
   }
 
   // Fallback to using very last argument as the callback function
-  if ((callback == null) && typeof args[args.length - 1] === 'function') {
-    callback = args[args.length - 1]
+  var lastArgument = args[args.length - 1]
+  if ((callback == null) && typeof lastArgument === 'function') {
+    callback = lastArgument
   }
 
   return [window, options, callback]