[Solved] How can you use catchError to log an error and then rethrow it to be handled elsewhere? - Ans: catchError(err => { console.error(err); return throwError(() => err); }) | Angular

Angular - RxJS Operators

How can you use catchError to log an error and then rethrow it to be handled elsewhere?

AcatchError(err => { console.error(err); return of(err); })

BcatchError(err => { console.error(err); return throwError(() => err); })

CcatchError(err => throwError(err))

DcatchError(err => { throw err; })

Step-by-Step Solution

Solution:

Step 1: Log error inside catchError
Use console.error(err) to log the error.
Step 2: Rethrow error as Observable
Return throwError(() => err) to rethrow error as Observable for further handling.
Final Answer:
catchError(err => { console.error(err); return throwError(() => err); }) -> Option B
Quick Check:
Log then rethrow error as Observable with throwError [OK]

Quick Trick: Log error then return throwError to rethrow inside catchError [OK]

Common Mistakes:

MISTAKES

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How can you use catchError to log an error and then rethrow it to be handled elsewhere?