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Why might forgetting to unsubscribe from Observables cause subtle bugs in Angular applications?

hard🧠 Conceptual Q10 of 15
Angular - RxJS and Observables Fundamentals
Why might forgetting to unsubscribe from Observables cause subtle bugs in Angular applications?
ABecause subscriptions only run once and then stop
BBecause Angular automatically unsubscribes, so no bugs occur
CBecause unsubscribing slows down the app
DBecause subscriptions keep running, causing unexpected side effects and memory leaks
Step-by-Step Solution
Solution:

  1. Step 1: Understand subscription behavior

    Subscriptions continue emitting values until unsubscribed.

  2. Step 2: Effects of not unsubscribing

    They cause memory leaks and unexpected behavior as they keep running in background.

  3. Final Answer:

    Because subscriptions keep running, causing unexpected side effects and memory leaks -> Option D

  4. Quick Check:

    Unsubscribed subscriptions prevent bugs and leaks = D [OK]
Quick Trick: Active subscriptions cause bugs if not unsubscribed [OK]
Common Mistakes:
MISTAKES
  • Assuming Angular auto-unsubscribes
  • Thinking unsubscribing hurts performance
  • Believing subscriptions run only once

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