Angular - RxJS Operators
In an Angular app, you want to ignore user clicks that occur while an HTTP request triggered by a previous click is still in progress. Which RxJS operator best fits this requirement?
In an Angular app, you want to ignore user clicks that occur while an HTTP request triggered by a previous click is still in progress. Which RxJS operator best fits this requirement?
hard🧠 Conceptual Q8 of 15
Step-by-Step Solution
Solution:
Step 1: Understand the requirement
Ignore new clicks while a request is active.Step 2: Match operator behavior
exhaustMap ignores new source emissions while the inner observable is active, perfect for this use case.Step 3: Contrast with others
mergeMap allows concurrent requests; concatMap queues them; switchMap cancels previous requests.Final Answer:
exhaustMap -> Option BQuick Check:
exhaustMap ignores new emissions during active inner observable [OK]
Quick Trick: exhaustMap ignores new clicks during active requests [OK]
Common Mistakes:
MISTAKES- Using mergeMap causing multiple concurrent requests
- Using switchMap which cancels previous requests instead of ignoring
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