Angular2 Observable – Await multiple function calls before proceeding

I have been doing this with forkJoin

import {Observable} from 'rxjs/Observable';
import 'rxjs/add/observable/forkJoin';

Observable.forkJoin(
  this.http.get('./friends.json').map((res: Response) => res.json()),
  this.http.get('./customer.json').map((res: Response) => res.json())
)
.subscribe(res => this.combined = {friends: res[0].friends, customer: res[1]});

Some more info here: http://www.syntaxsuccess.com/viewarticle/angular-2.0-and-http