How to return value inside subscribe Angular 4

Question

I\'m new to observables in angular. I have a problem wanting to return a value inside a subscribe method. I have the following method (getFirebaseData(idForm:string):o

Answer 1

Observable runs when you subscribe to it and what return from subscription is always a subscription object like setInterval. first sample: because this is a async call, second console.log won't wait for subscribe to finish before it executes.

getTotalQuestions(idForm: string) {
  let totalQuestions: number;
  return this.getFirebaseData(idForm + "/Metadatos").pipe(
     map(items =>
      items.map(item => {
        totalQuestions = item.Total;
        console.log(totalQuestions);
      });
    ));
}

getTotalQuestions('231').subscribe(console.log)