The article emphasizes that the Visitor pattern should not be combined with instanceof checks, as it violates the Open/Closed principle and results in tight coupling among classes. This combination can lead to maintainability issues, duplicated code, and brittle designs. The author advocates for a proper implementation of the Visitor pattern by favoring polymorphism and encapsulating behavior, which enhances readability and reduces dependencies between the algorithm and the objects, allowing for easier modifications without impacting existing classes.
Combining the Visitor pattern with instanceof checks leads to a fragile and hard-to-maintain design, violating the Open/Closed principle and creating tight coupling.
Correctly implementing the Visitor pattern requires favoring polymorphism over instanceof checks, ensuring maintainable, readable, and expandable code.
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