add simple type checker implementation

js/src/carousel.js

@@ -33,6 +33,14 @@ const Carousel = (($) => {
     wrap     : true
   }
 
+  const DefaultType = {
+    interval : '(number|boolean)',
+    keyboard : 'boolean',
+    slide    : '(boolean|string)',
+    pause    : '(string|boolean)',
+    wrap     : 'boolean'
+  }
+
   const Direction = {
     NEXT     : 'next',
     PREVIOUS : 'prev'
@@ -84,7 +92,7 @@ const Carousel = (($) => {
       this._isPaused          = false
       this._isSliding         = false
 
-      this._config            = config
+      this._config            = this._getConfig(config)
       this._element           = $(element)[0]
       this._indicatorsElement = $(this._element).find(Selector.INDICATORS)[0]
 
@@ -193,6 +201,12 @@ const Carousel = (($) => {
 
     // private
 
+    _getConfig(config) {
+      config = $.extend({}, Default, config)
+      Util.typeCheckConfig(NAME, config, DefaultType)
+      return config
+    }
+
     _addEventListeners() {
       if (this._config.keyboard) {
         $(this._element)