medium-rxjs-reactive-service.ts

@Injectable()
export class UserSearchService {

  constructor(private _http: Http) {}

  searchUsers(username: string): Observable<User[]> {
    return username ?
      this._http.get(`https://api.github.com/search/users?q=${username}`)
        .map(response => response.json())
        .map(content => content.items) :
      Observable.of<User[]>([]);
  }
}