You want to design an Angular app where multiple components react to user login status changes instantly. Which design pattern best fits this need and why?

hard📝 Conceptual Q15 of 15

Angular - Advanced Patterns

AObserver pattern, because it lets components subscribe and react to login status updates.

BSingleton pattern, because it creates multiple instances of login components.

CFactory pattern, because it generates new login forms dynamically.

DDecorator pattern, because it styles the login button differently.

Step-by-Step Solution

Solution:

Step 1: Understand the problem context
Multiple components need to react instantly when login status changes.
Step 2: Match design pattern to behavior
The Observer pattern allows components to subscribe to changes and update automatically.
Step 3: Evaluate other options
Singleton ensures single instance but doesn't handle event updates; Factory creates objects; Decorator changes appearance.
Final Answer:
Observer pattern, because it lets components subscribe and react to login status updates. -> Option A
Quick Check:
Observer = subscribe and react to changes [OK]

Quick Trick: Observer pattern = react to changes instantly [OK]

Common Mistakes:

Confusing Singleton with event notification
Using Factory for event handling
Thinking Decorator changes behavior, not style

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More Angular Quizzes

You want to design an Angular app where multiple components react to user login status changes instantly. Which design pattern best fits this need and why?

Step 1: Understand the problem context

Step 2: Match design pattern to behavior

Step 3: Evaluate other options

Final Answer:

Quick Check:

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