[Solved] You want to create an Angular component that listens to a user input Observable and updates a display value.... Which approach best manages the subscription lifecycle and avoids memory leaks? | Angular

Angular - RxJS and Observables Fundamentals

You want to create an Angular component that listens to a user input Observable and updates a display value. The Observable may emit multiple times quickly. Which approach best manages the subscription lifecycle and avoids memory leaks?

AUse a global variable to store data and avoid subscribing

BSubscribe in the constructor and never unsubscribe

CSubscribe in ngOnInit without unsubscribing, relying on Angular to clean up

DSubscribe in ngOnInit and unsubscribe in ngOnDestroy using a Subscription object

Step-by-Step Solution

Solution:

Step 1: Proper subscription management
Subscribing in ngOnInit ensures the component starts listening after creation.
Step 2: Unsubscribe in ngOnDestroy to prevent leaks
Unsubscribing cleans up resources when the component is removed, avoiding memory leaks.
Final Answer:
Subscribe in ngOnInit and unsubscribe in ngOnDestroy using a Subscription object -> Option D
Quick Check:
Subscribe ngOnInit + unsubscribe ngOnDestroy = safe lifecycle [OK]

Quick Trick: Pair subscribe in ngOnInit with unsubscribe in ngOnDestroy [OK]

Common Mistakes:

MISTAKES

Subscribing in constructor which is too early
Not unsubscribing and causing leaks
Using global variables instead of Observables

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More Angular Quizzes

Which approach best manages the subscription lifecycle and avoids memory leaks?

Step 1: Proper subscription management

Step 2: Unsubscribe in `ngOnDestroy` to prevent leaks

Final Answer:

Quick Check:

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