Visitor pattern moves some logic of certain types of objects to an external entity(named the visitor), and that external entity/visitor is responsible for performing operations on the object. This pattern separates the logic to work with certain types of objects. This article demonstrates Visitor pattern implementations in GoLang.
Visitor pattern allows detailed implementation of methods in concrete classes, and also ensures a common interface for visiting different implementations. This article demonstrates Visitor pattern implementations in TypeScript.
Visitor pattern moves the operation or calculation part from the element/subject classes to a completely separate class. That separate class is called the visitor. As the operation/calculation is moved to the visitor class, so if we want to change the operation then we can just change the visitor class. No change in the subject classes is required in that case.
Visitor pattern is used to move the operation/calculation part from a group of classes to a completely separate(Visitor) class. This article demonstrates Visitor pattern implementations in Java.