diff --git a/src/switch/switch.js b/src/switch/switch.js
index b97b2990..3df47910 100644
--- a/src/switch/switch.js
+++ b/src/switch/switch.js
@@ -15,269 +15,265 @@
  * limitations under the License.
  */
 
-/**
- * Class constructor for Checkbox MDL component.
- * Implements MDL component design pattern defined at:
- * https://github.com/jasonmayes/mdl-component-design-pattern
- * @param {HTMLElement} element The element that will be upgraded.
- */
-function MaterialSwitch(element) {
+(function() {
   'use strict';
 
-  this.element_ = element;
+  /**
+   * Class constructor for Checkbox MDL component.
+   * Implements MDL component design pattern defined at:
+   * https://github.com/jasonmayes/mdl-component-design-pattern
+   *
+   * @param {HTMLElement} element The element that will be upgraded.
+   */
+  var MaterialSwitch = function MaterialSwitch(element) {
+    this.element_ = element;
 
-  // Initialize instance.
-  this.init();
-}
+    // Initialize instance.
+    this.init();
+  };
+  window.MaterialSwitch = MaterialSwitch;
 
-/**
- * Store constants in one place so they can be updated easily.
- * @enum {string | number}
- * @private
- */
-MaterialSwitch.prototype.Constant_ = {
-  TINY_TIMEOUT: 0.001
-};
+  /**
+   * Store constants in one place so they can be updated easily.
+   *
+   * @enum {String | Number}
+   * @private
+   */
+  MaterialSwitch.prototype.Constant_ = {
+    TINY_TIMEOUT: 0.001
+  };
 
-/**
- * Store strings for class names defined by this component that are used in
- * JavaScript. This allows us to simply change it in one place should we
- * decide to modify at a later date.
- * @enum {string}
- * @private
- */
-MaterialSwitch.prototype.CssClasses_ = {
-  INPUT: 'mdl-switch__input',
-  TRACK: 'mdl-switch__track',
-  THUMB: 'mdl-switch__thumb',
-  FOCUS_HELPER: 'mdl-switch__focus-helper',
-  RIPPLE_EFFECT: 'mdl-js-ripple-effect',
-  RIPPLE_IGNORE_EVENTS: 'mdl-js-ripple-effect--ignore-events',
-  RIPPLE_CONTAINER: 'mdl-switch__ripple-container',
-  RIPPLE_CENTER: 'mdl-ripple--center',
-  RIPPLE: 'mdl-ripple',
-  IS_FOCUSED: 'is-focused',
-  IS_DISABLED: 'is-disabled',
-  IS_CHECKED: 'is-checked'
-};
-
-/**
- * Handle change of state.
- * @param {Event} event The event that fired.
- * @private
- */
-MaterialSwitch.prototype.onChange_ = function(event) {
-  'use strict';
-
-  this.updateClasses_();
-};
-
-/**
- * Handle focus of element.
- * @param {Event} event The event that fired.
- * @private
- */
-MaterialSwitch.prototype.onFocus_ = function(event) {
-  'use strict';
-
-  this.element_.classList.add(this.CssClasses_.IS_FOCUSED);
-};
-
-/**
- * Handle lost focus of element.
- * @param {Event} event The event that fired.
- * @private
- */
-MaterialSwitch.prototype.onBlur_ = function(event) {
-  'use strict';
-
-  this.element_.classList.remove(this.CssClasses_.IS_FOCUSED);
-};
-
-/**
- * Handle mouseup.
- * @param {Event} event The event that fired.
- * @private
- */
-MaterialSwitch.prototype.onMouseUp_ = function(event) {
-  'use strict';
-
-  this.blur_();
-};
-
-/**
- * Handle class updates.
- * @private
- */
-MaterialSwitch.prototype.updateClasses_ = function() {
-  'use strict';
-  this.checkDisabled();
-  this.checkToggleState();
-};
-
-/**
- * Add blur.
- * @private
- */
-MaterialSwitch.prototype.blur_ = function(event) {
-  'use strict';
-
-  // TODO: figure out why there's a focus event being fired after our blur,
-  // so that we can avoid this hack.
-  window.setTimeout(function() {
-    this.inputElement_.blur();
-  }.bind(this), this.Constant_.TINY_TIMEOUT);
-};
-
-// Public methods.
-
-/**
-* Check the components disabled state.
-* @public
-*/
-MaterialSwitch.prototype.checkDisabled = function() {
-  'use strict';
-  if (this.inputElement_.disabled) {
-    this.element_.classList.add(this.CssClasses_.IS_DISABLED);
-  } else {
-    this.element_.classList.remove(this.CssClasses_.IS_DISABLED);
-  }
-};
-
-/**
-* Check the components toggled state.
-* @public
-*/
-MaterialSwitch.prototype.checkToggleState = function() {
-  'use strict';
-  if (this.inputElement_.checked) {
-    this.element_.classList.add(this.CssClasses_.IS_CHECKED);
-  } else {
-    this.element_.classList.remove(this.CssClasses_.IS_CHECKED);
-  }
-};
-
-/**
- * Disable switch.
- * @public
- */
-MaterialSwitch.prototype.disable = function() {
-  'use strict';
-
-  this.inputElement_.disabled = true;
-  this.updateClasses_();
-};
-
-/**
- * Enable switch.
- * @public
- */
-MaterialSwitch.prototype.enable = function() {
-  'use strict';
-
-  this.inputElement_.disabled = false;
-  this.updateClasses_();
-};
-
-/**
- * Activate switch.
- * @public
- */
-MaterialSwitch.prototype.on = function() {
-  'use strict';
-
-  this.inputElement_.checked = true;
-  this.updateClasses_();
-};
-
-/**
- * Deactivate switch.
- * @public
- */
-MaterialSwitch.prototype.off = function() {
-  'use strict';
-
-  this.inputElement_.checked = false;
-  this.updateClasses_();
-};
-
-/**
- * Initialize element.
- */
-MaterialSwitch.prototype.init = function() {
-  'use strict';
-
-  if (this.element_) {
-    this.inputElement_ = this.element_.querySelector('.' +
-        this.CssClasses_.INPUT);
-
-    var track = document.createElement('div');
-    track.classList.add(this.CssClasses_.TRACK);
-
-    var thumb = document.createElement('div');
-    thumb.classList.add(this.CssClasses_.THUMB);
-
-    var focusHelper = document.createElement('span');
-    focusHelper.classList.add(this.CssClasses_.FOCUS_HELPER);
-
-    thumb.appendChild(focusHelper);
-
-    this.element_.appendChild(track);
-    this.element_.appendChild(thumb);
-
-    this.boundMouseUpHandler = this.onMouseUp_.bind(this);
-
-    if (this.element_.classList.contains(
-        this.CssClasses_.RIPPLE_EFFECT)) {
-      this.element_.classList.add(
-          this.CssClasses_.RIPPLE_IGNORE_EVENTS);
-      this.rippleContainerElement_ = document.createElement('span');
-      this.rippleContainerElement_.classList.add(
-          this.CssClasses_.RIPPLE_CONTAINER);
-      this.rippleContainerElement_.classList.add(this.CssClasses_.RIPPLE_EFFECT);
-      this.rippleContainerElement_.classList.add(this.CssClasses_.RIPPLE_CENTER);
-      this.rippleContainerElement_.addEventListener('mouseup', this.boundMouseUpHandler);
-
-      var ripple = document.createElement('span');
-      ripple.classList.add(this.CssClasses_.RIPPLE);
-
-      this.rippleContainerElement_.appendChild(ripple);
-      this.element_.appendChild(this.rippleContainerElement_);
-    }
-
-    this.boundChangeHandler = this.onChange_.bind(this);
-    this.boundFocusHandler = this.onFocus_.bind(this);
-    this.boundBlurHandler = this.onBlur_.bind(this);
-
-    this.inputElement_.addEventListener('change', this.boundChangeHandler);
-    this.inputElement_.addEventListener('focus', this.boundFocusHandler);
-    this.inputElement_.addEventListener('blur', this.boundBlurHandler);
-    this.element_.addEventListener('mouseup', this.boundMouseUpHandler);
+  /**
+   * Store strings for class names defined by this component that are used in
+   * JavaScript. This allows us to simply change it in one place should we
+   * decide to modify at a later date.
+   *
+   * @enum {String}
+   * @private
+   */
+  MaterialSwitch.prototype.CssClasses_ = {
+    INPUT: 'mdl-switch__input',
+    TRACK: 'mdl-switch__track',
+    THUMB: 'mdl-switch__thumb',
+    FOCUS_HELPER: 'mdl-switch__focus-helper',
+    RIPPLE_EFFECT: 'mdl-js-ripple-effect',
+    RIPPLE_IGNORE_EVENTS: 'mdl-js-ripple-effect--ignore-events',
+    RIPPLE_CONTAINER: 'mdl-switch__ripple-container',
+    RIPPLE_CENTER: 'mdl-ripple--center',
+    RIPPLE: 'mdl-ripple',
+    IS_FOCUSED: 'is-focused',
+    IS_DISABLED: 'is-disabled',
+    IS_CHECKED: 'is-checked'
+  };
 
+  /**
+   * Handle change of state.
+   *
+   * @param {Event} event The event that fired.
+   * @private
+   */
+  MaterialSwitch.prototype.onChange_ = function(event) {
     this.updateClasses_();
-    this.element_.classList.add('is-upgraded');
-  }
-};
+  };
 
-/*
-* Downgrade the component.
-*/
-MaterialSwitch.prototype.mdlDowngrade_ = function() {
-  'use strict';
-  if (this.rippleContainerElement_) {
-    this.rippleContainerElement_.removeEventListener('mouseup', this.boundMouseUpHandler);
-  }
-  this.inputElement_.removeEventListener('change', this.boundChangeHandler);
-  this.inputElement_.removeEventListener('focus', this.boundFocusHandler);
-  this.inputElement_.removeEventListener('blur', this.boundBlurHandler);
-  this.element_.removeEventListener('mouseup', this.boundMouseUpHandler);
-};
+  /**
+   * Handle focus of element.
+   *
+   * @param {Event} event The event that fired.
+   * @private
+   */
+  MaterialSwitch.prototype.onFocus_ = function(event) {
+    this.element_.classList.add(this.CssClasses_.IS_FOCUSED);
+  };
 
-// The component registers itself. It can assume componentHandler is available
-// in the global scope.
-componentHandler.register({
-  constructor: MaterialSwitch,
-  classAsString: 'MaterialSwitch',
-  cssClass: 'mdl-js-switch',
-  widget: true
-});
+  /**
+   * Handle lost focus of element.
+   *
+   * @param {Event} event The event that fired.
+   * @private
+   */
+  MaterialSwitch.prototype.onBlur_ = function(event) {
+    this.element_.classList.remove(this.CssClasses_.IS_FOCUSED);
+  };
+
+  /**
+   * Handle mouseup.
+   *
+   * @param {Event} event The event that fired.
+   * @private
+   */
+  MaterialSwitch.prototype.onMouseUp_ = function(event) {
+    this.blur_();
+  };
+
+  /**
+   * Handle class updates.
+   *
+   * @private
+   */
+  MaterialSwitch.prototype.updateClasses_ = function() {
+    this.checkDisabled();
+    this.checkToggleState();
+  };
+
+  /**
+   * Add blur.
+   *
+   * @private
+   */
+  MaterialSwitch.prototype.blur_ = function(event) {
+    // TODO: figure out why there's a focus event being fired after our blur,
+    // so that we can avoid this hack.
+    window.setTimeout(function() {
+      this.inputElement_.blur();
+    }.bind(this), this.Constant_.TINY_TIMEOUT);
+  };
+
+  // Public methods.
+
+  /**
+   * Check the components disabled state.
+   *
+   * @public
+   */
+  MaterialSwitch.prototype.checkDisabled = function() {
+    if (this.inputElement_.disabled) {
+      this.element_.classList.add(this.CssClasses_.IS_DISABLED);
+    } else {
+      this.element_.classList.remove(this.CssClasses_.IS_DISABLED);
+    }
+  };
+
+  /**
+   * Check the components toggled state.
+   *
+   * @public
+   */
+  MaterialSwitch.prototype.checkToggleState = function() {
+    if (this.inputElement_.checked) {
+      this.element_.classList.add(this.CssClasses_.IS_CHECKED);
+    } else {
+      this.element_.classList.remove(this.CssClasses_.IS_CHECKED);
+    }
+  };
+
+  /**
+   * Disable switch.
+   *
+   * @public
+   */
+  MaterialSwitch.prototype.disable = function() {
+    this.inputElement_.disabled = true;
+    this.updateClasses_();
+  };
+
+  /**
+   * Enable switch.
+   *
+   * @public
+   */
+  MaterialSwitch.prototype.enable = function() {
+    this.inputElement_.disabled = false;
+    this.updateClasses_();
+  };
+
+  /**
+   * Activate switch.
+   *
+   * @public
+   */
+  MaterialSwitch.prototype.on = function() {
+    this.inputElement_.checked = true;
+    this.updateClasses_();
+  };
+
+  /**
+   * Deactivate switch.
+   *
+   * @public
+   */
+  MaterialSwitch.prototype.off = function() {
+    this.inputElement_.checked = false;
+    this.updateClasses_();
+  };
+
+  /**
+   * Initialize element.
+   */
+  MaterialSwitch.prototype.init = function() {
+    if (this.element_) {
+      this.inputElement_ = this.element_.querySelector('.' +
+          this.CssClasses_.INPUT);
+
+      var track = document.createElement('div');
+      track.classList.add(this.CssClasses_.TRACK);
+
+      var thumb = document.createElement('div');
+      thumb.classList.add(this.CssClasses_.THUMB);
+
+      var focusHelper = document.createElement('span');
+      focusHelper.classList.add(this.CssClasses_.FOCUS_HELPER);
+
+      thumb.appendChild(focusHelper);
+
+      this.element_.appendChild(track);
+      this.element_.appendChild(thumb);
+
+      this.boundMouseUpHandler = this.onMouseUp_.bind(this);
+
+      if (this.element_.classList.contains(
+          this.CssClasses_.RIPPLE_EFFECT)) {
+        this.element_.classList.add(
+            this.CssClasses_.RIPPLE_IGNORE_EVENTS);
+        this.rippleContainerElement_ = document.createElement('span');
+        this.rippleContainerElement_.classList.add(
+            this.CssClasses_.RIPPLE_CONTAINER);
+        this.rippleContainerElement_.classList.add(this.CssClasses_.RIPPLE_EFFECT);
+        this.rippleContainerElement_.classList.add(this.CssClasses_.RIPPLE_CENTER);
+        this.rippleContainerElement_.addEventListener('mouseup', this.boundMouseUpHandler);
+
+        var ripple = document.createElement('span');
+        ripple.classList.add(this.CssClasses_.RIPPLE);
+
+        this.rippleContainerElement_.appendChild(ripple);
+        this.element_.appendChild(this.rippleContainerElement_);
+      }
+
+      this.boundChangeHandler = this.onChange_.bind(this);
+      this.boundFocusHandler = this.onFocus_.bind(this);
+      this.boundBlurHandler = this.onBlur_.bind(this);
+
+      this.inputElement_.addEventListener('change', this.boundChangeHandler);
+      this.inputElement_.addEventListener('focus', this.boundFocusHandler);
+      this.inputElement_.addEventListener('blur', this.boundBlurHandler);
+      this.element_.addEventListener('mouseup', this.boundMouseUpHandler);
+
+      this.updateClasses_();
+      this.element_.classList.add('is-upgraded');
+    }
+  };
+
+  /**
+   * Downgrade the component.
+   *
+   * @private
+   */
+  MaterialSwitch.prototype.mdlDowngrade_ = function() {
+    if (this.rippleContainerElement_) {
+      this.rippleContainerElement_.removeEventListener('mouseup', this.boundMouseUpHandler);
+    }
+    this.inputElement_.removeEventListener('change', this.boundChangeHandler);
+    this.inputElement_.removeEventListener('focus', this.boundFocusHandler);
+    this.inputElement_.removeEventListener('blur', this.boundBlurHandler);
+    this.element_.removeEventListener('mouseup', this.boundMouseUpHandler);
+  };
+
+  // The component registers itself. It can assume componentHandler is available
+  // in the global scope.
+  componentHandler.register({
+    constructor: MaterialSwitch,
+    classAsString: 'MaterialSwitch',
+    cssClass: 'mdl-js-switch',
+    widget: true
+  });
+})();