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Solution - New Observable


import { Observable } from 'rxjs';

const o = new Observable((subscriber) => {;
o.subscribe((value) => {

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Let's review the solution code above:

  • First, we import the Observable class from the rxjs dependency.
  • Next, we create a new instance of the Observable class.
  • We provide a callback function that is invoked with the subscriber.
  • We invoke the next() method on the subscriber, specifying the value of 1.
  • We invoke the subscribe() method on the Observable instance and log out the value.