In object-oriented systems, we often need to perform different operations on complex data structures. If the operation logic is embedded directly inside the data structure, it will not only increase the complexity of the class, but also make the code difficult to maintain and expand. The Visitor Pattern provides an elegant way to define new operations for these structures by separating operations from data structures. This article will introduce the concept of the Visitor Pattern in detail, the difference from other patterns, the problems it solves, and implementation examples in Golang...

In software development, we often need to traverse elements in data structures, such as collections, arrays, or linked lists. In order to avoid coupling the traversal logic inside the data structure and improve the readability and scalability of the code, the Iterator Pattern came into being. This article will introduce in detail the concept of the Iterator Pattern, the difference from other patterns, the problems it solves, and how to implement and use the Iterator Pattern in Golang. What is the Iterator Pattern?