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User Experience

1. Core Angular Concepts (must-know)

• Architecture: NgModules, Components, Directives, Services, Dependency Injection (providers, hierarchical injector).
• Component basics: Lifecycle hooks (ngOnInit, ngOnChanges, ngDoCheck, ngAfterViewInit, ngOnDestroy), change detection strategies (Default vs OnPush).
• Templates & binding: Interpolation, property/attribute/binding events, two-way binding [(ngModel)], structural directives (*ngIf, *ngFor), attribute directives ([ngClass], [ngStyle]).
• Routing: RouterModule, Routes, lazy loading, route guards (CanActivate, CanDeactivate, Resolve), route params, child routes, preloading strategies.
• Forms: Template-driven vs Reactive Forms, FormControl/FormGroup/FormArray, custom validators, async validators, valueChanges, form performance.
• HTTP & Observables: HttpClient, interceptors, RxJS basics (Observable vs Promise), subjects, BehaviorSubject, operators (map, switchMap, mergeMap, concatMap, exhaustMap, catchError, debounceTime, takeUntil).
• State management: Component state vs service state, NgRx fundamentals (store, actions, reducers, selectors, effects), alternatives (Akita, NGXS, small RxJS stores).
• Change detection & performance: Zone.js basics, manual change detection (ChangeDetectorRef, markForCheck, detach), trackBy for ngFor, OnPush pitfalls.
• Testing: Component/unit tests (TestBed), shallow vs isolated tests, mocking HttpClient (HttpTestingController), Jasmine/Karma or Jest setup.
• Build & deployment: Angular CLI, build optimization (AOT, production flags, budgets), file hashing, differential loading (legacy browsers), service workers (PWA).
• Security: XSS prevention (DomSanitizer), template sanitization, avoiding innerHTML, Content Security Policy basics.
• i18n & accessibility: Angular i18n, a11y best practices (ARIA, keyboard navigation).
• Tooling: ESLint, Prettier, Husky, Nx monorepo basics, Storybook for components.

Standalone Components: Be ready to explain the transition away from NgModules and how it simplifies tree-shaking and component testing. Decoded Frontend - Angular Interview Hacking %21%21TOP%21%21