function(options) {
      options = options || {};
  
      this._firstRender = true;
      this._initializeRegions(options);
  
      Marionette.ItemView.call(this, options);
    }
function(options) {
      options = options || {};
  
      this._firstRender = true;
      this._initializeRegions(options);
  
      Marionette.ItemView.call(this, options);
    }
function ( options ) { options = options || { } ; this . _firstRender = true ; this . _initializeRegions ( options ) ; Marionette . ItemView . call ( this , options ) ; }
Ensure the regions are available when the `initialize` method is called.
Ensure the regions are available when the initialize method is called .