Moving type check vars outside of typeOf definition to speed up subse…

…quent lookups.

src/ds.js

@@ -459,23 +459,26 @@
   });
 
 
-  /**
-   * Returns the type of an input object.
-   * Stolen from jQuery via @rwaldron (http://pastie.org/2849690)
-   * @param {?} obj - the object being detected.
-   */
-  DS.typeOf = function(obj) {
+  (function() {
     var classType = {},
       types = "Boolean Number String Function Array Date RegExp Object".split(" "),
       length = types.length,
       i = 0;
     for ( ; i < length; i++ ) {
       classType[ "[object " + types[ i ] + "]" ] = types[ i ].toLowerCase();
     }
-    return obj == null ?
-      String( obj ) :
-      classType[ {}.toString.call(obj) ] || "object";
-  };
+    /**
+     * Returns the type of an input object.
+     * Stolen from jQuery via @rwaldron (http://pastie.org/2849690)
+     * @param {?} obj - the object being detected.
+     */
+    DS.typeOf = function(obj) {
+
+      return obj == null ?
+        String( obj ) :
+        classType[ {}.toString.call(obj) ] || "object";
+    };
+  })();
 
   DS.VERSION = "0.0.1";