How does combining the Observer and Singleton patterns benefit state management in Angular applications?

hard📝 Conceptual Q9 of 15

Angular - Advanced Patterns

AThe Observer pattern ensures multiple instances of the service exist, while Singleton limits event emissions.

BA Singleton service acts as a single source of truth, while Observer pattern allows components to react to state changes asynchronously.

CSingleton pattern manages multiple event streams, and Observer pattern restricts state updates to one component.

DCombining these patterns eliminates the need for Angular's change detection.

Step-by-Step Solution

Solution:

Step 1: Singleton as centralized state
Singleton ensures one shared instance managing the app state.
Step 2: Observer for reactive updates
Observer pattern lets components subscribe and react to state changes asynchronously.
Final Answer:
A Singleton service acts as a single source of truth, while Observer pattern allows components to react to state changes asynchronously. -> Option B
Quick Check:
Singleton centralizes state; Observer enables reactive updates [OK]

Quick Trick: Singleton centralizes state; Observer enables reactive updates [OK]

Common Mistakes:

Master "Advanced Patterns" in Angular

9 interactive learning modes - each teaches the same concept differently

Want More Practice?

15+ quiz questions · All difficulty levels · Free

More Angular Quizzes