TypeScript - wait for an observable/promise to finish, and return observable

Question

I am quite new to TypeScript & RxJS, and I am trying to return an Observable after another Observable is finished:

public myObs         


        

Answer 1

While flatMap() may work, since you are not passing in a parameter that is used[see param (x)], the best operator for you to use in this scenario is forkJoin().

Please see this example: https://stackoverflow.com/a/38049268/1742393

   Observable.forkJoin(
    this.http.get('/app/books.json').map((res:Response) => res.json()),
    this.http.get('/app/movies.json').map((res:Response) => res.json())
).subscribe(
  data => {
    this.books = data[0]
    this.movies = data[1]
  },
  err => console.error(err)
);