Question

What is an observable?

Answer 1

An Observable is a unique Object similar to a Promise that can help manage async code. Observables are not part of the JavaScript language so we need to rely on a popular Observable library called RxJS. The observables are created using new keyword.

Let see the simple example of observable,

import { Observable } from 'rxjs';

const observable = new Observable(observer => {

  setTimeout(() => {

    observer.next('Hello from a Observable!');

  }, 2000);

});