getObservableFromFetch(url){
  //Create and return an Observable.
  return Observable.create(observer => {
    //Make use of Fetch API to get data from URL
    fetch(url)
      .then(res => {
        /*The response.json() doesn't return json, it returns a "readable stream" which is a promise which needs to be resolved to get the actual data.*/
        return res.json();
      })
      .then(body => {
        observer.next(body);
        /*Complete the Observable as it won't produce any more event */
        observer.complete();
      })
      //Handle error
      .catch(err => observer.error(err));
  })
}