Decoded Frontend - Angular Interview Hacking %21%21top%21%21

Explain that OnPush skips checking a component unless its @Input references change, an event originates from the component, or an observable emits via the async pipe.

export const authGuard: CanActivateFn = (route, state) => const authService = inject(AuthService); const router = inject(Router); return authService.isAuthenticated() ? true : router.parseUrl('/login'); ; Use code with caution. Resolver Optimization

Remember: The interviewer isn't looking for syntax. They are looking for . Show them you understand the why , not just the what .

| Feature | AngularJS (1.x) | Angular (2+) | | --- | --- | --- | | Architecture | MVC | Component‑based / MVVM | | Language | JavaScript | TypeScript | | Dependency Injection | Service locator pattern | Hierarchical DI system | | Mobile support | Limited | Full mobile support | | Performance | Slower digest cycle | Optimized change detection |

Don't just say one is better. Explain that Reactive Forms are more scalable and easier to unit test because the logic is defined in the TypeScript class rather than the HTML template. Decoded Frontend - Angular Interview Hacking %21%21TOP%21%21

Instead of loading your entire bundle upfront, partition your application into smaller chunks:

updateUser() // Signal mutation triggers fine-grained updates this.users.update(users => [...users, newUser]);

exhaustMap : Ignores new outer values while the current inner observable is running. Ideal for preventing double-submits on a login button. Memory Leak Mitigation

Unlike standard Q&A lists, this "hacking" approach uses and detailed feedback to expose knowledge gaps before the real interview. Junior/Middle Focus Senior "Hacking" Focus Components Basic lifecycle hooks Smart vs. Dumb patterns Performance Basic lazy loading AOT vs. JIT and SSR State Management Simple services Standalone components and Signals Testing Unit testing basics Conscious testing strategies Practical Tips for Success Explain that OnPush skips checking a component unless

– Change detection + DI + lifecycle hooks (with code examples) Day 2 – RxJS marble diagrams + common patterns + state management Day 3 – Mock interviews + optimizing a real small Angular app

// The Hack: Collect all validators automatically export const VALIDATORS = new InjectionToken<Validator[]>('VALIDATORS');

By anchoring your preparation in these architectural pillars, you transform your technical interview from a stressful examination into a collaborative, high-level engineering discussion.

→ Show you can pick the right tool, not just the popular one. | Feature | AngularJS (1

Old way (Memory leak risk):

ngOnDestroy() this.destroy$.next(); this.destroy$.complete();

By focusing on architectural intent, modern framework features, and performance trade-offs, you reverse-engineer the interviewer's rubric and position yourself as an expert frontend engineer.