angular-docs-cn/public/docs/_examples/toh-5/ts/app/hero.service.ts

// #docplaster
// #docregion
import { Hero } from './hero';
import { HEROES } from './mock-heroes';
import { Injectable } from '@angular/core';

@Injectable()
export class HeroService {
  getHeroes(): Promise<Hero[]> {
    return Promise.resolve(HEROES);
  }

  getHeroesSlowly(): Promise<Hero[]> {
    return new Promise<Hero[]>(resolve =>
      setTimeout(resolve, 2000)) // delay 2 seconds
      .then(() => this.getHeroes());
  }

  // #docregion getHero
  getHero(id: number): Promise<Hero> {
    return this.getHeroes()
               .then(heroes => heroes.find(hero => hero.id === id));
  }
  // #enddocregion getHero
}