@Injectable()
export class UsersInfoService {
  private _users: User[]=[];
  private isLoggedIn = false;
  private URL = '/assets/data';
  constructor(private http: Http) {
   this.getData();
  }

  addUser(user: User) {
    this._users.push(user);
  }

  getUser(id) {
    console.log(this._users);
    this._users.find(user =>user.id === id);
  }

  getUsers() {
    return this._users;
  }

getData(){
     this.http.get(this.URL + '/user.json')
      .map(res => res.json() as User[])
      .subscribe((res) => {
        this._users.push(res);
      },
      err => console.error(err),
      () => console.log('done')
      );
        console.log(this._users);
}
  checkAuth(emailAddress, password) {
     console.log("checkAuth :" + this._users);
    this._users.forEach(user => {
      if (user.emailAddress === emailAddress && user.password === password) {
        return true
      }
    });
    return false;
  }
}

[
  {
  "id":"1",
  "userName":"admin@site.com",
  "firstName":"admin",
  "lastName": "admin",
  "dateOfBirth":"05/05/1985",
  "emailAddress":"admin@site.com",
  "password":"admin123"
},
{
  "id":"2",
  "userName":"admin2@site.com",
  "firstName":"admin2",
  "lastName": "admin2",
  "dateOfBirth":"05/05/1985",
  "emailAddress":"admin2@site.com",
  "password":"admin456"
}
]