You have a system with multiple element types and want to add a new operation without modifying existing element classes. How does the Visitor pattern help in this scenario?

hard📝 Trade-off Q15 of 15

LLD - Behavioral Design Patterns — Part 2

ABy using inheritance to extend element classes with new operations

BBy creating a new visitor class implementing the operation for all element types

CBy adding new methods to each element class directly

DBy storing operations inside element objects as data

Step-by-Step Solution

Solution:

Step 1: Understand the problem of adding new operations
Modifying existing element classes is risky and breaks encapsulation.
Step 2: Apply Visitor pattern solution
Create a new visitor class that implements the new operation for all element types, keeping element classes unchanged.
Final Answer:
By creating a new visitor class implementing the operation for all element types -> Option B
Quick Check:
Visitor adds operations via new visitor classes [OK]

Quick Trick: Add new visitor class for new operations [OK]

Common Mistakes:

MISTAKES

Modifying element classes directly
Using inheritance to add operations
Embedding operations as data in elements

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More LLD Quizzes

You have a system with multiple element types and want to add a new operation without modifying existing element classes. How does the Visitor pattern help in this scenario?

Step 1: Understand the problem of adding new operations

Step 2: Apply Visitor pattern solution

Final Answer:

Quick Check:

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