LLD - Behavioral Design Patterns — Part 2
You are designing a notification system where some users may not want notifications. How can the Null Object pattern help here?
You are designing a notification system where some users may not want notifications. How can the Null Object pattern help here?
hard📝 Trade-off Q8 of Q15
Step-by-Step Solution
Solution:
Step 1: Identify problem with disabled notifications
Users who don't want notifications cause null or conditional checks.Step 2: Apply Null Object pattern
Provide a NullNotifier that safely ignores notify calls, removing need for checks.Final Answer:
Provide a NullNotifier that implements notify but does nothing, avoiding null checks. -> Option AQuick Check:
Null Object avoids conditional logic [OK]
Quick Trick: Null Object handles optional behavior safely [OK]
Common Mistakes:
MISTAKES- Using exceptions for control flow
- Relying on global flags
- Removing required methods
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