Angular2. How can I check if an observable is completed?

Question

In my page there is a button that generates a report. That report needs data that is loaded using a http call to a rest endpoint when the page is loaded, but I do not have a

Answer 1

If you're doing this to debug, the simplest solution is to use the complete argument of tap:

tap(next: null, error: null, complete: () => void)

With a source source$ it would look like this:

source$.pipe(
  tap(undefined, undefined, console.log)
);