Angular - RxJS Operators
Why is it important that the function passed to
catchError returns an Observable?Why is it important that the function passed to catchError returns an Observable?
hard🧠 Conceptual Q10 of 15
Step-by-Step Solution
Solution:
Step 1: Understand catchError's role in stream recovery
It replaces the error stream with a new Observable to keep the stream alive.Step 2: Why Observable return is required
Returning an Observable ensures the stream continues correctly; returning other types breaks the contract.Final Answer:
Because catchError replaces the error stream with a new Observable to continue the flow. -> Option BQuick Check:
catchError must return Observable to continue stream [OK]
Quick Trick: catchError returns Observable to replace error and continue stream [OK]
Common Mistakes:
MISTAKES- Thinking catchError converts to Promise
- Assuming catchError works only synchronously
- Believing catchError unsubscribes on non-Observable return
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