New/Better way of releasing object?

Noticed some codes are using a new (better?) way of releasing objects in the "dealloc". As below, an extra "," was added and then followed by assigning it to "nil"... Which is quite interesting...

- (void)dealloc

{

    [_window release], _window=nil;

    [_viewController release], _viewController=nil;

    [super dealloc];

}

Posted in: sample code