LLD - Behavioral Design Patterns — Part 1
In the Observer pattern, what is the main responsibility of the Subject?
In the Observer pattern, what is the main responsibility of the Subject?
easy🧠 Conceptual Q2 of Q15
Step-by-Step Solution
Solution:
Step 1: Identify Subject's role
The Subject holds the state and manages observers.Step 2: Understand notification responsibility
When the Subject's state changes, it must notify all registered observers.Final Answer:
To notify all registered observers about state changes -> Option BQuick Check:
Subject responsibility = Notify observers [OK]
Quick Trick: Subject tells observers when state changes [OK]
Common Mistakes:
MISTAKES- Thinking Subject updates observers' internal data
- Confusing unregistering with notification
- Assuming Subject creates observers
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