nitayneeman/canceling-an-observable.example.js

## canceling-an-observable.example.js
Rx.Observable
  .interval(1000)
  .first((value) => value === 3)
  .subscribe(
    (value) => console.log(`Emitted value: ${value}`),
    (error) => console.error(error),
    () => console.log('Completed')
  );
	Rx.Observable
	.interval(1000)
	.first((value) => value === 3)
	.subscribe(
	(value) => console.log(`Emitted value: ${value}`),
	(error) => console.error(error),
	() => console.log('Completed')
	);