angular-docs-cn/public/docs/_examples/cb-dependency-injection/ts/app/hero.service.ts

// #docregion
import { Injectable } from '@angular/core';
import { Hero }       from './hero';

@Injectable()
export class HeroService {

  // TODO move to database
  private heroes: Array<Hero> = [
    new Hero(1, 'RubberMan', 'Hero of many talents', '123-456-7899'),
    new Hero(2, 'Magma', 'Hero of all trades', '555-555-5555'),
    new Hero(3, 'Mr. Nice', 'The name says it all', '111-222-3333')
 ];

  getHeroById(id: number): Hero {
    return this.heroes.find(hero => hero.id === id);
  }

  getAllHeroes(): Array<Hero> {
    return this.heroes;
  }
}