diff --git a/lib/yui/formchangechecker/formchangechecker.js b/lib/yui/formchangechecker/formchangechecker.js
index 46cdc4ee10688..033cd7d6c102a 100644
--- a/lib/yui/formchangechecker/formchangechecker.js
+++ b/lib/yui/formchangechecker/formchangechecker.js
@@ -1,14 +1,10 @@
 YUI.add('moodle-core-formchangechecker',
     function(Y) {
-        // The CSS selectors we use
-        var CSS = {
-        };
-
-        var FORMCHANGECHECKERNAME = 'core-formchangechecker';
+        var FORMCHANGECHECKERNAME = 'core-formchangechecker',
 
-        var FORMCHANGECHECKER = function() {
-            FORMCHANGECHECKER.superclass.constructor.apply(this, arguments);
-        }
+            FORMCHANGECHECKER = function() {
+                FORMCHANGECHECKER.superclass.constructor.apply(this, arguments);
+            };
 
         Y.extend(FORMCHANGECHECKER, Y.Base, {
 
@@ -18,11 +14,11 @@ YUI.add('moodle-core-formchangechecker',
                 /**
                  * Initialize the module
                  */
-                initializer : function(config) {
-                    var formid = 'form#' + this.get('formid');
+                initializer : function() {
+                    var formid = 'form#' + this.get('formid'),
+                        currentform = Y.one(formid);
 
                     // Add change events to the form elements
-                    var currentform = Y.one(formid);
                     currentform.delegate('change', M.core_formchangechecker.set_form_changed, 'input', this);
                     currentform.delegate('change', M.core_formchangechecker.set_form_changed, 'textarea', this);
                     currentform.delegate('change', M.core_formchangechecker.set_form_changed, 'select', this);
@@ -48,18 +44,15 @@ YUI.add('moodle-core-formchangechecker',
                  * get_form_dirty_state function later.
                  */
                 store_initial_value : function(e) {
+                    var thisevent;
                     if (e.target.hasClass('ignoredirty')) {
                         // Don't warn on elements with the ignoredirty class
                         return;
                     }
                     if (M.core_formchangechecker.get_form_dirty_state()) {
-                        // Clear the store_initial_value listeners as the form is already dirty so
-                        // we no longer need to call this function
-                        var formid = 'form#' + this.get('formid');
-
                         // Detach all listen events to prevent duplicate initial value setting
-                        var thisevent;
-                        while (thisevent = this.initialvaluelisteners.shift()) {
+                        while (this.initialvaluelisteners.length) {
+                            thisevent = this.initialvaluelisteners.shift();
                             thisevent.detach();
                         }
 
@@ -71,7 +64,7 @@ YUI.add('moodle-core-formchangechecker',
                     M.core_formchangechecker.stateinformation.focused_element = {
                         element : e.target,
                         initial_value : e.target.get('value')
-                    }
+                    };
                 }
             },
             {
@@ -92,7 +85,7 @@ YUI.add('moodle-core-formchangechecker',
             var formchangechecker = new FORMCHANGECHECKER(config);
             M.core_formchangechecker.instances.push(formchangechecker);
             return formchangechecker;
-        }
+        };
 
         // Store state information
         M.core_formchangechecker.stateinformation = [];
@@ -110,14 +103,14 @@ YUI.add('moodle-core-formchangechecker',
             // Once the form has been marked as dirty, we no longer need to keep track of form elements
             // which haven't yet blurred
             delete M.core_formchangechecker.stateinformation.focused_element;
-        }
+        };
 
         /**
          * Set the form submitted state to true
          */
         M.core_formchangechecker.set_form_submitted = function() {
             M.core_formchangechecker.stateinformation.formsubmitted = 1;
-        }
+        };
 
         /**
          * Attempt to determine whether the form has been modified in any way and
@@ -126,7 +119,8 @@ YUI.add('moodle-core-formchangechecker',
          * @return Integer 1 is the form is dirty; 0 if not
          */
         M.core_formchangechecker.get_form_dirty_state = function() {
-            var state = M.core_formchangechecker.stateinformation;
+            var state = M.core_formchangechecker.stateinformation,
+                editor;
 
             // If the form was submitted, then return a non-dirty state
             if (state.formsubmitted) {
@@ -141,7 +135,7 @@ YUI.add('moodle-core-formchangechecker',
             // If a field has been focused and changed, but still has focus then the browser won't fire the
             // onChange event. We check for this eventuality here
             if (state.focused_element) {
-                if (state.focused_element.element.get('value') != state.focused_element.initial_value) {
+                if (state.focused_element.element.get('value') !== state.focused_element.initial_value) {
                     return 1;
                 }
             }
@@ -149,8 +143,8 @@ YUI.add('moodle-core-formchangechecker',
             // Handle TinyMCE editor instances
             // We can't add a listener in the initializer as the editors may not have been created by that point
             // so we do so here instead
-            if (typeof tinyMCE != 'undefined') {
-                for (var editor in tinyMCE.editors) {
+            if (typeof tinyMCE !== 'undefined') {
+                for (editor in tinyMCE.editors) {
                     if (tinyMCE.editors[editor].isDirty()) {
                         return 1;
                     }