// Create simple observable that emits three values const myObservable = of(1, 2, 3); // Create observer object const myObserver = { next: x => console.log('Observer got a next value: ' + x), error: err => console.error('Observer got an error: ' + err), complete: () => console.log('Observer got a complete notification'), }; // Execute with the observer object myObservable.subscribe(myObserver); // Logs: // Observer got a next value: 1 // Observer got a next value: 2 // Observer got a next value: 3 // Observer got a complete notification