Return from nested observable

nested-observable-switchmap.ts

import { Observable, of } from "rxjs";
import { switchMap, map } from "rxjs/operators";

class DataFactory {
  static getSetupData() {
    return of({ param1: "someparam" });
  }

  static getUsefulData(setupData: any) {
    // pretend we use setupData in some fancy way
    return of({ datapoint: "x" });
  }

  static getData(): Observable<string> {
    return DataFactory.getSetupData().pipe(
      switchMap((setupData) => DataFactory.getUsefulData(setupData)),
      map((usefulData) => usefulData.datapoint)
    );
  }
}

DataFactory.getData().subscribe((d) => console.log("Recieved Value", d));