Bird
0
0

In Angular, which RxJS operator allows multiple subscribers to share a single Observable execution, preventing multiple source invocations?

hard🚀 Application Q9 of 15
Angular - RxJS and Observables Fundamentals
In Angular, which RxJS operator allows multiple subscribers to share a single Observable execution, preventing multiple source invocations?
Afilter()
Bmap()
CshareReplay()
Dconcat()
Step-by-Step Solution
Solution:

  1. Step 1: Understand multicasting

    Sharing a single execution means multicasting the Observable.

  2. Step 2: Identify operator

    shareReplay() shares the source and replays last emissions to new subscribers.

  3. Final Answer:

    shareReplay() -> Option C

  4. Quick Check:

    shareReplay() enables shared subscription [OK]
Quick Trick: Use shareReplay() to multicast Observables [OK]
Common Mistakes:
MISTAKES
  • Using map() or filter() for sharing execution
  • Assuming concat() shares source
  • Not using any operator and causing multiple executions

Want More Practice?

15+ quiz questions · All difficulty levels · Free

Free Signup - Practice All Questions
More Angular Quizzes
HTTP Client - PUT and DELETE requests - Quiz 11easy HTTP Client - PUT and DELETE requests - Quiz 12easy HTTP Client - Setting headers and params - Quiz 9hard Routing - Defining routes array - Quiz 5medium Routing - Why routing is needed for SPAs - Quiz 9hard RxJS and Observables Fundamentals - Async pipe for template subscriptions - Quiz 4medium Services and Dependency Injection - Service-to-service injection - Quiz 15hard Services and Dependency Injection - Service scope (root, module, component) - Quiz 2easy Services and Dependency Injection - How dependency injection works in Angular - Quiz 12easy Template-Driven Forms - Showing validation errors - Quiz 8hard