More info on the visitor pattern, which was originally published by the Gang of Four: https://en.wikipedia.org/wiki/Visitor_pattern https://en.wikipedia.org/wi

More info on the visitor pattern, which was originally published by the Gang of Four: https://en.wikipedia.org/wiki/Visitor_pattern https://en.wikipedia.org/wiki/Visitor_pattern Rarely seen in its pure form in the wild, but it's vastly useful, and surprisingly versatile, when you need it.