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What is the primary reason to unsubscribe from Observables in Angular components?

easy🧠 Conceptual Q1 of 15
Angular - RxJS and Observables Fundamentals
What is the primary reason to unsubscribe from Observables in Angular components?
ATo automatically refresh the component's template
BTo improve the initial loading time of the component
CTo enable Angular's change detection to run faster
DTo prevent memory leaks by stopping ongoing data streams when the component is destroyed
Step-by-Step Solution
Solution:

  1. Step 1: Understand Observable subscriptions

    Subscriptions keep data streams active even if the component is destroyed.

  2. Step 2: Identify impact of not unsubscribing

    Active subscriptions after component destruction cause memory leaks and unexpected behavior.

  3. Final Answer:

    To prevent memory leaks by stopping ongoing data streams when the component is destroyed -> Option D

  4. Quick Check:

    Unsubscribing stops resource usage after component lifecycle ends [OK]
Quick Trick: Always unsubscribe to avoid memory leaks [OK]
Common Mistakes:
MISTAKES
  • Assuming Angular auto-unsubscribes all Observables
  • Believing unsubscribing improves template rendering speed

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