Angular - Lifecycle Hooks
You have multiple subscriptions in a component. Which is the best way to clean them up in
ngOnDestroy?You have multiple subscriptions in a component. Which is the best way to clean them up in ngOnDestroy?
hard📝 Conceptual Q8 of 15
Step-by-Step Solution
Solution:
Step 1: Understand managing multiple subscriptions
Managing many subscriptions individually is error-prone and verbose.Step 2: Use Subscription container
Subscription container (like Subscription.add or Subscription[]) allows grouping subscriptions and unsubscribing all at once.Final Answer:
Use a Subscription container and call unsubscribe once in ngOnDestroy -> Option AQuick Check:
Group subscriptions for single unsubscribe call [OK]
Quick Trick: Group subscriptions to unsubscribe once in ngOnDestroy [OK]
Common Mistakes:
- Unsubscribing each subscription manually
- Assuming Angular auto-unsubscribes
- Setting subscriptions to null without unsubscribing
Master "Lifecycle Hooks" in Angular
Want More Practice?
15+ quiz questions · All difficulty levels · Free
Free Signup - Practice All QuestionsMore Angular Quizzes