already have function check for callbacks

Author: scottusrobus

lib/resource.js

@@ -22,15 +22,15 @@ Resource.prototype = {
 
       if (method.match(/retrieve|update|items|files/)) {
         _this[method] = function(id, options, callback) {
-          if (id.id && _this.isFunction(options)) {
+          if (id.id && _this.isCallbackFunction(options)) {
             params.callback = options;
             params.id = id.id;
             delete options.id;
             params.options = id;
           }
           else {
             params.id = id;
-            if (_this.isFunction(options)) {
+            if (_this._this.isCallbackFunction(options)) {
               params.callback = options;
             } else {
               params.options = options;
@@ -145,10 +145,6 @@ Resource.prototype = {
 
   isCallbackFunction: function(obj) {
     return !!(obj && obj.constructor && obj.call && obj.apply);
-  },
-
-  isFunction: function(obj) {
-    return !!(obj && obj.constructor && obj.call && obj.apply);
   }
 };