async pipe

Unwraps a value from an asynchronous primitive.

The async pipe subscribes to an Observable or Promise and returns the latest value it has emitted. When a new value is emitted, the async pipe marks the component to be checked for changes. When the component gets destroyed, the async pipe unsubscribes automatically to avoid potential memory leaks.

Time: {{ time | async }}
export class AppComponent {
  time = new Observable<string>((observer: Observer<string>) => {
    setInterval(() => Date().toString()), 1000);
observable|async Time: Tue Jun 25 2019 22:48:40 GMT+0000 (UTC)