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Understand Angular's DI system and service architecture patterns
Learn module architecture, lazy loading, and scalable Angular patterns
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Angular components and lifecycle hooks
RxJS observables and operators
Services and dependency injection
Angular modules and lazy loading
Reactive forms and template-driven forms
State management with NgRx
A: Angular's DI is a design pattern where classes receive dependencies from external sources rather than creating them. Services are registered in providers (root, module, or component level). The Injector creates a hierarchical tree of injectors. Use @Injectable() decorator and specify providedIn: 'root' for singleton services across the app.
A: Default change detection checks all components on every browser event. OnPush only checks when: input references change, events originate from the component, or async pipe emits. OnPush improves performance by reducing checks. Use with immutable data patterns and markForCheck() when needed.
A: RxJS operators transform observable streams. Common ones: map (transform values), filter (conditional emission), switchMap (cancel previous, switch to new observable), mergeMap (run concurrently), debounceTime (delay emissions), catchError (error handling). Operators are pure functions that create new observables.
A: Lifecycle hooks are callback methods: ngOnInit (after first ngOnChanges), ngOnChanges (when input properties change), ngDoCheck (custom change detection), ngAfterViewInit (after view initialization), ngOnDestroy (cleanup before destruction). Use ngOnInit for initialization, ngOnDestroy for subscriptions cleanup.
Understand the difference between template-driven and reactive forms
Master RxJS operators and know when to unsubscribe from observables
Practice with NgRx or Akita for state management in large applications
Know how to implement lazy loading for better performance
Understand Angular modules, shared modules, and feature modules structure
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