backbonejs inheritance

gist.js

 ///facilitates inheritance ....gist from https://gist.github.com/1542120
  ;(function(Backbone) {

    // The super method takes two parameters: a method name
    // and an array of arguments to pass to the overridden method.
    // This is to optimize for the common case of passing 'arguments'.
    function _super(methodName, args) {

      // Keep track of how far up the prototype chain we have traversed,
      // in order to handle nested calls to _super.
      this._superCallObjects || (this._superCallObjects = {});
      var currentObject = this._superCallObjects[methodName] || this, parentObject = findSuper(methodName, currentObject);
      this._superCallObjects[methodName] = parentObject;

      var result = parentObject[methodName].apply(this, args || []);
      delete this._superCallObjects[methodName];
      return result;
    }

    // Find the next object up the prototype chain that has a
    // different implementation of the method.
    function findSuper(methodName, childObject) {
      var object = childObject;
      while(object[methodName] === childObject[methodName]) {
        object = object.constructor.__super__;
      }
      return object;
    }


    _.each(["Model", "Collection", "View", "Router"], function(klass) {
      Backbone[klass].prototype._super = _super;
    });
  })(Backbone);