getResult (): Observable<result[]> {
    return this.http.get(this.url)
      .map(this.extractData)
      .catch(this.handleError);
  }


  private extractData(res: Response) {
    let body = res.json();

    // save the data in the service
    this.data = body;

    return body || { };
  }

getData() {

         this.data // undefeind !!!!
}

this.myService.getResult()
      .subscribe(res => {this.data= res;
        },
        error => {
          console.log("error on getData function: " + error);
        }
      );

getResult (): Observable<result[]> {
    return this.http.get(this.url)
      .map((res)=>this.extractData(res))
      .catch((err)=>this.handleError(err));
  }