Add element to Observable array typescript

I have an angular 2 Component which make use of service that is getting data from rest api.

import { OnInit, Component } from '@angular/core';
import { Hero } from './hero';
import { HeroService } from './hero.service2';
import { Observable } from 'rxjs';


@Component({
selector: 'my-list',
templateUrl: 'app/hero-list.component.html',
})
export class HeroListComponent implements OnInit {
errorMessage: string;
heroes: Observable<Hero[]>;
mode = 'Observable';

constructor (
private heroService: HeroService
) {}

ngOnInit() { this.getHeroes(); }

getHeroes() {
this.heroes = this.heroService.getHeroes()
}

addHero (name: string) {
if (!name) { return; }

this.heroService.addHero(name)
.subscribe(
hero => this.getHeroes()
);
}
}


How can i improve addHero ? Because right now it looks like very inefficient. I would like to just add hero that is returned by this.heroService.addHero() to heroes Observable. How do i do that?

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