How to 'wait' for two observables in RxJS

Question

In my app i have something like:

this._personService.getName(id)
      .concat(this._documentService.getDocument())
      .subscribe((response) => {
              


        

Answer 1

Use forkJoin() method of observables. Check this link for reference

From the RXJS docs

This operator is best used when you have a group of observables and only care about the final emitted value of each. One common use case for this is if you wish to issue multiple requests on page load (or some other event) and only want to take action when a response has been receieved for all. In this way it is similar to how you might use Promise.all

Observable.forkJoin([character, characterHomeworld]).subscribe(results => {
  // results[0] is our character
  // results[1] is our character homeworld
  results[0].homeworld = results[1];
  this.loadedCharacter = results[0];
});

Code taken from: https://coryrylan.com/blog/angular-multiple-http-requests-with-rxjs