Drabito Technologies interview question

Differences between switchMap and mergeMap in RxJS and when to use each. How to toggle all checkboxes on or off by using a single checkbox input. Detailed discussion on the importance of NGRX in their development workflow. Questions about Angular services—particularly the use of @Injectable({ providedIn: 'root' }), how many instances it creates, and how to scope a service specifically to a single component instead of providing it globally.