What is async pipe?

What is Angular 2 Async Pipe?

What is Async Pipe?
Angular 2 provides us special kinds of pipe that is called Async pipe and the Async pipe subscribes to an Observable or Promise and returns the latest value it has emitted.

The Async pipe allows us to bind our templates directly to values that arrive asynchronously manner and this is the great ability for the promises and observables.

Stayed Informed What is Pipes?

Example for AsyncPipe with Promise using NgFor,

@Component({
    selector: 'app-promise',
    template: '<ul> < li * ngFor="let user of users | async">  Id: {{user.id }}, Name: {{user.name }} </li>< /ul>'
})
export class PromiseComponent {
    //USERS DECLARATIONS.
    users = [];

    //FETCHING JSON DATA FROM REST APIS
    userRestApiUrl: string = 'https://api.github.com/users/hadley/orgs';

    //HOME COMPONENT CONSTRUCTOR
    constructor(private userService: UserService) { }

    //GET USERS SERVICE ON PAGE LOAD.
    ngOnInit() {
        this.userService.getUsers(this.userRestApiUrl).subscribe(data => this.users = data);
    }
}


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