you can refactor those nested observables using mergeMap: this._settingsService.settings$.mergeMap(settings => { this.settings = settings;

you can refactor those nested observables using mergeMap: this._settingsService.settings$.mergeMap(settings => { this.settings = settings; return this._weatherService.getLatestWeather(this._location, settings); }) .subscribe( weather => this.weather = weather, error => this.errorMessage = <any>error );