[Solved] You want to handle user search input so that if a search is running, new inputs are ignored until... searchInput$.pipe( ???(query => performSearch(query)) ).subscribe(results => display(results)); | Angular

Angular - RxJS Operators

You want to handle user search input so that if a search is running, new inputs are ignored until it finishes. Which operator should you use and why?

searchInput$.pipe(
  ???(query => performSearch(query))
).subscribe(results => display(results));

A<code>exhaustMap</code> because it ignores new searches while one is running

B<code>concatMap</code> because it queues searches and runs them one by one

C<code>mergeMap</code> because it runs all searches simultaneously

D<code>switchMap</code> because it cancels previous searches on new input

Step-by-Step Solution

Solution:

Step 1: Understand the requirement
The user wants to ignore new search inputs while a search is running, preventing duplicates.
Step 2: Match operator behavior
exhaustMap ignores new inner observables if one is active, perfect for this use case. mergeMap runs all, concatMap queues, switchMap cancels previous.
Final Answer:
exhaustMap because it ignores new searches while one is running -> Option A
Quick Check:
Ignore new inputs during active task = exhaustMap [OK]

Quick Trick: Ignore new tasks while running = exhaustMap [OK]

Common Mistakes:

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You want to handle user search input so that if a search is running, new inputs are ignored until it finishes. Which operator should you use and why?