juniorReactive Programming
What is Observer Pattern?
Updated May 6, 2026
Short answer
A pattern where observers subscribe to subjects to receive updates.
Deep explanation
It decouples producers and consumers. Observers are notified automatically when state changes.
Real-world example
Notification systems in apps.
Common mistakes
- Tight coupling between subject and observers.
Follow-up questions
- How is it used in RxJS?
- What are its limitations?