1.  
  2. // Create simple observable that emits three values
  3. const myObservable = of(1, 2, 3);
  4.  
  5. // Create observer object
  6. const myObserver = {
  7.   next: x => console.log('Observer got a next value: ' + x),
  8.   error: err => console.error('Observer got an error: ' + err),
  9.   complete: () => console.log('Observer got a complete notification'),
  10. };
  11.  
  12. // Execute with the observer object
  13. myObservable.subscribe(myObserver);
  14. // Logs:
  15. // Observer got a next value: 1
  16. // Observer got a next value: 2
  17. // Observer got a next value: 3
  18. // Observer got a complete notification
  19.