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Why does Angular's HttpClient GET method return an Observable instead of a Promise?

hard🧠 Conceptual Q10 of 15
Angular - HTTP Client
Why does Angular's HttpClient GET method return an Observable instead of a Promise?
AObservables support multiple values and cancellation, Promises do not
BPromises are deprecated in Angular
CObservables are easier to write than Promises
DPromises cannot handle HTTP requests
Step-by-Step Solution
Solution:

  1. Step 1: Compare Observables and Promises

    Observables can emit multiple values over time and support cancellation, unlike Promises which resolve once.

  2. Step 2: Understand Angular design choice

    HttpClient uses Observables to allow features like retry, cancellation, and operators for complex async flows.

  3. Final Answer:

    Observables support multiple values and cancellation, Promises do not -> Option A

  4. Quick Check:

    HttpClient uses Observables for flexibility [OK]
Quick Trick: Observables allow cancel and multiple values, Promises don't [OK]
Common Mistakes:
MISTAKES
  • Thinking Promises are deprecated
  • Believing Promises can't do HTTP
  • Assuming Observables are simpler

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