Observable Finally on Subscribe

Question

According to this artcle, onComplete and onError function of the subscribe are mutually exclusive.

Meaning either onEr

Answer 1

The only thing which worked for me is this

fetchData()
  .subscribe(
    (data) => {
       //Called when success
     },
    (error) => {
       //Called when error
    }
  ).add(() => {
       //Called when operation is complete (both success and error)
  });