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Service-based State

Introduction

Services with BehaviorSubject provide a simple yet powerful state management solution for mid-sized applications.

Pattern

@Injectable({ providedIn: 'root' })
export class UserStateService {
  private currentUser = new BehaviorSubject<User | null>(null);
  readonly user$ = this.currentUser.asObservable();

  setUser(user: User) { this.currentUser.next(user); }
  clearUser() { this.currentUser.next(null); }
  get currentUserValue() { return this.currentUser.value; }
}

When to Use

Shared state across a feature
Simple state without complex side effects

Summary

Service-based state balances simplicity with functionality for most applications.”