LLD - Behavioral Design Patterns — Part 2
Which behavioral pattern is best suited when you want multiple objects to be notified automatically when one object changes its state?
Which behavioral pattern is best suited when you want multiple objects to be notified automatically when one object changes its state?
easy🧠 Conceptual Q11 of 15
Step-by-Step Solution
Solution:
Step 1: Understand the need for automatic notifications
The problem requires multiple objects to be updated when one object changes state, which means a one-to-many dependency.Step 2: Match the pattern to the problem
The Observer pattern is designed exactly for this: it lets observers subscribe to an object and get notified on changes.Final Answer:
Observer pattern -> Option AQuick Check:
Change notification = Observer [OK]
Quick Trick: Notifications to many? Use Observer pattern [OK]
Common Mistakes:
MISTAKES- Confusing Strategy with Observer
- Using Command for notifications
- Choosing Chain of Responsibility for updates
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