[Solved] Which of the following is the correct syntax to create a simple observable in Angular? - Ans: const obs = new Observable(subscriber => { subscriber.next('Hello');... | Angular

Angular - RxJS and Observables Fundamentals

Which of the following is the correct syntax to create a simple observable in Angular?

Aconst obs = Observable.create('Hello');

Bconst obs = new Observable(subscriber => { subscriber.next('Hello'); subscriber.complete(); });

Cconst obs = new Promise(subscriber => { subscriber.next('Hello'); });

Dconst obs = Observable.emit('Hello');

Step-by-Step Solution

Solution:

Step 1: Recall the Observable constructor syntax
Observables are created with new Observable and a function receiving a subscriber object.
Step 2: Check each option for correct syntax
const obs = new Observable(subscriber => { subscriber.next('Hello'); subscriber.complete(); }); uses new Observable with subscriber.next and subscriber.complete correctly; others misuse methods or types.
Final Answer:
const obs = new Observable(subscriber => { subscriber.next('Hello'); subscriber.complete(); }); -> Option B
Quick Check:
Correct Observable syntax = B [OK]

Quick Trick: Use new Observable(subscriber => {...}) to create observables. [OK]

Common Mistakes:

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Which of the following is the correct syntax to create a simple observable in Angular?