Get latest value of an Observable and a Behaviour Subject

Question

I have a observable and a behaviour subject. I want to get their latest values, check if they are both true and assign the result to an observable.

1. Observable will select a boolean from the NgRx Store:

   this.i18nStateService.defaultMarketChangeTriggered()
   

2. BehaviourSubject is also a boolean

   this.cookieService.isCookieLayerConfirmed$
   

This is my approach.

   this.result$ = this.i18nStateService.defaultMarketChangeTriggered()
              .pipe(
                map(defaultMarketChangedTriggered => defaultMarketChangedTriggered  && !this.cookieService.isCookieLayerConfirmed$)
              );

Answer 1

I think you need a combination approach. Try using combineLatest.

import { combineLatest } from 'rxjs';

this.result$ = combineLatest(this.i18nStateService.defaultMarketChangeTriggered(),
                             this.cookieService.isCookieLayerConfirmed$).pipe(

            // pluck the combination of those two observables individually to these variables
       map(([defaultMarketChangeTriggered, isCookieLayerConfirmed]) => defaultMarketChangeTriggered && isCookieLayerConfirmed), 
);