Angular - RxJS and Observables Fundamentals
Which of the following is the correct syntax to create a simple observable that emits the value 5 and completes?
Which of the following is the correct syntax to create a simple observable that emits the value 5 and completes?
easy📝 Syntax Q3 of 15
Step-by-Step Solution
Solution:
Step 1: Review observable creation syntax
Creating an observable requires passing a function with an observer that callsnextandcomplete.Step 2: Check each option
Only new Observable(observer => { observer.next(5); observer.complete(); }) correctly uses the constructor with a function that emits 5 and completes.Final Answer:
new Observable(observer => { observer.next(5); observer.complete(); }) -> Option BQuick Check:
Correct observable syntax = new Observable(observer => { observer.next(5); observer.complete(); }) [OK]
Quick Trick: Use new Observable with observer function to emit values [OK]
Common Mistakes:
MISTAKES- Using Observable.create incorrectly
- Passing value directly to Observable constructor
- Using non-existent emit method
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