diff --git a/index.js b/index.js
index f59de06..012316b 100644
--- a/index.js
+++ b/index.js
@@ -1,16 +1,18 @@
-(function ($) {
-    
+/* global jQuery */
+
+(($) => {
+
     $.fn.aalert = function (method) {
         if (methods[method]) {
             return methods[method].apply(this, Array.prototype.slice.call(arguments, 1));
-        } else {
-            $.error('Method ' + method + ' does not exist');
-            return false;
         }
+
+        $.error('Method ' + method + ' does not exist');
+        return false;
     };
 
     var methods = {
-        
+
         changeTo(valiant) {
             var $this = $(this);
 
@@ -58,9 +60,9 @@
                 $this.hide();
             }
 
-            if ( $this.hasClass('remove')) {
+            if ($this.hasClass('remove')) {
                 $this.remove();
-            } 
+            }
 
             return this;
         },
@@ -69,7 +71,7 @@
             var $this = $(this);
             if ($this.hasClass('fade')) {
                 $this.fadeIn();
-            } else if ( $this.hasClass('slide')) {
+            } else if ($this.hasClass('slide')) {
                 $this.slideDown();
             } else {
                 $this.show();
@@ -90,7 +92,7 @@
     };
 
     $('.alert [data-dismiss="aalert"]').click(e => {
-        $element = $(e.target).closest('.alert');
+        var $element = $(e.target).closest('.alert');
         methods.close.apply($element);
     });
 
@@ -98,4 +100,4 @@
         methods.closeAfter.apply(element, [$(element).data('timeout')]);
     });
 
-})(jQuery);
\ No newline at end of file
+})(jQuery);