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import { Observable } from 'rxjs';
import { of } from 'rxjs';
import { Hero } from '../models/hero';
import { HEROES } from './mock-heroes';
export class HeroService {
private static _instance: HeroService;
getHeroes(): Observable<Hero[]> {
return of(HEROES);
public static get Instance(): HeroService {
// Do you need arguments? Make it a regular method instead.
return this._instance || (this._instance = new this());
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