LLD - Behavioral Design Patterns — Part 2
In a system with many element classes, how does the Visitor pattern facilitate adding a new operation without modifying existing element classes?
In a system with many element classes, how does the Visitor pattern facilitate adding a new operation without modifying existing element classes?
hard📝 Trade-off Q8 of Q15
Step-by-Step Solution
Solution:
Step 1: Understand Visitor pattern usage
Visitor pattern allows adding operations by defining new visitor classes.Step 2: Avoid modifying elements
Elements remain unchanged; new operations are added via visitors.Step 3: Implementation
Create a new Visitor class with the operation and pass it to elements' accept methods.Final Answer:
By creating a new Visitor class implementing the operation and passing it to elements. -> Option AQuick Check:
New visitors add operations without element changes [OK]
Quick Trick: New Visitor classes add operations without element edits [OK]
Common Mistakes:
MISTAKES- Modifying element classes directly
- Using inheritance instead of visitors
- Embedding logic inside elements
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