It's been a while since I've written a pure programming post. I was recently implementing a specialist collection class that contained items of a number of different types. I needed to be able to iterate over the collection performing different actions depending on the specific type. There are lots of different ways to do this,…

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Neil Madden

Explores the Visitor design pattern through a modern lens using Java 25, demonstrating how to implement a fluent visitor interface for traversing data structures. Shows how visitors provide better encapsulation than direct pattern matching, allowing radical changes to underlying representations while maintaining the same logical interface. Connects the pattern to functional programming concepts by explaining visitors as a generalized fold/reduce operation over arbitrary data structures.

Fluent Visitors: revisiting a classic design pattern

A functional programming view on the humble Visitor