If you work in a language that can pass closures as arguments, then you don't need a special visitor pattern. It is one of those patterns, that exists because o

If you work in a language that can pass closures as arguments, then you don't need a special visitor pattern. It is one of those patterns, that exists because of limitations of languages. Or, if you want to call passing a closure visitor pattern in some cases, it becomes so natural, that it does not deserve special mention as something out of the ordinary. You may be too smart for it.