Interview Q&A

Short answer: What are pipeline templates and how are they used? Answer: Templates let you reuse pipeline steps across projects — great for standardization.

Example code

You can create a reusable file: 📄 .azure-pipelines/build-template.yml steps: script: dotnet restore script: dotnet build Then in your main pipeline: extends: template: .azure-pipelines/build-template.yml This keeps your YAML DRY (Don’t Repeat Yourself) and consistent.

Real-world example (ShopNest)

ShopNest’s YAML pipeline builds on every PR, runs unit tests, then deploys to a staging slot on main-branch merges.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: "ApplicationInsights": { "ConnectionString": "InstrumentationKey=xxxx-xxxx-xxxx" }

Real-world example (ShopNest)

Azure DevOps holds ShopNest repos, boards, and release pipelines in one place so build + deploy stay repeatable.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: Restore packages as usual:? is a common interview topic in Azure DevOps. Give a clear definition, then one concrete example.

Real-world example (ShopNest)

Azure DevOps holds ShopNest repos, boards, and release pipelines in one place so build + deploy stay repeatable.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: dd SonarQube tasks to your build pipeline: task: SonarQubePrepare@5 inputs: SonarQube: 'MySonarServiceConnection' scannerMode: 'MSBuild' projectKey: 'MyProject' projectName: 'MyApp' script: dotnet build task: SonarQubeAnalyze@5 task: SonarQubePublish@5 inputs: pollingTimeoutSec: '300'

Real-world example (ShopNest)

Azure DevOps holds ShopNest repos, boards, and release pipelines in one place so build + deploy stay repeatable.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: <<<<<<< HEAD old code ======= new code >>>>>>> feature/login

Real-world example (ShopNest)

Azure DevOps holds ShopNest repos, boards, and release pipelines in one place so build + deploy stay repeatable.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: Use async/await with Angular's waitForAsync or Jasmine’s done callback. Use Angular’s fakeAsync and tick() to simulate asynchronous passage of time. Example with fakeAsync: it('should fetch data asynchronously', fakeAsync(() => { let data; service.getData().subscribe(result => data = result); tick(); // simulate async time passing expect(data).toEqual(['expected data']); }));

Real-world example (ShopNest)

ShopNest admin can be built in Angular with modules/components, services for API calls, and reactive forms for product edit.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: Lazy loading delays loading feature modules until the user navigates to their route. Implemented with the router using loadChildren and dynamic imports.

Example code

const routes: Routes = [ { path: 'admin', loadChildren: () => import('./admin/admin.module').then(m => m.AdminModule) } ]; This reduces initial bundle size and improves app startup time.

Real-world example (ShopNest)

ShopNest admin can be built in Angular with modules/components, services for API calls, and reactive forms for product edit.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: ngular? Create a validator function returning an error object or null. ✅ Example (Custom validator checking forbidden name): function forbiddenNameValidator(nameRe: RegExp): ValidatorFn { return (control: AbstractControl): ValidationErrors | null => { const forbidden = nameRe.test(control.value); return forbidden ? { forbiddenName: { value:… control.value…… }… ngular? ngular? Create a validator function returning an…

Explain a bit more

error object or null. ✅ Example (Custom validator checking forbidden name): function forbiddenNameValidator(nameRe: RegExp): ValidatorFn { return (control: AbstractControl): ValidationErrors | null => { const forbidden = nameRe.test(control.value); return forbidden ? { forbiddenName: { value: control.value }… ngular? Create a validator function returning an error object or null. ✅ Example (Custom validator checking forbidden name): function forbiddenNameValidator(nameRe: RegExp): ValidatorFn { return (control: AbstractControl): ValidationErrors | null => { const forbidden = nameRe.test(control.value); return forbidden ? {… ngular?… const forbidden = nameRe.test(control.value);

Example code

return forbidden ? { forbiddenName: { value: control.value } } : null; }; } // Usage: new FormControl('', [forbiddenNameValidator(/admin/i)])

Real-world example (ShopNest)

ShopNest admin can be built in Angular with modules/components, services for API calls, and reactive forms for product edit.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: decorators. Decorators are functions that add metadata to classes, methods, or properties. Common Angular Decorators: Decorator Description @Componen Declares a component @NgModule Declares a module @Injectab le Declares a service for DI @Input() Pass data from parent to child @Output() Emit events from child to parent @Directiv Create custom… directives…… @Component({ selector: 'app-header', templateUrl:…

Example code

Use @Input() in a product card to pass product details from a parent ProductListComponent.

Real-world example (ShopNest)

ShopNest admin can be built in Angular with modules/components, services for API calls, and reactive forms for product edit.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: Use Async Validators returning Observable<ValidationErrors | null>. ✅

Example code

function uniqueUsernameValidator(service: UserService): AsyncValidatorFn { return (control: AbstractControl): Observable<ValidationErrors | null> => { return service.checkUsername(control.value).pipe( map(isTaken => (isTaken ? { uniqueUsername: true } : null)) ); }; } // Usage: new FormControl('', null, uniqueUsernameValidator(this.userService));

Real-world example (ShopNest)

ShopNest admin can be built in Angular with modules/components, services for API calls, and reactive forms for product edit.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: Pipes transform data in templates. Used with the pipe | operator. Angular provides built-in pipes like date, currency, uppercase, async, etc.

Example code

<p>{{ birthday | date:'longDate' }}</p>

Real-world example (ShopNest)

ShopNest admin can be built in Angular with modules/components, services for API calls, and reactive forms for product edit.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: Use HttpClientTestingModule and HttpTestingController to mock and control HTTP requests.

Example code

beforeEach(() => { TestBed.configureTestingModule({ imports: [HttpClientTestingModule] }); httpTestingController = TestBed.inject(HttpTestingController); }); it('should call GET API', () => { service.getData().subscribe(data => { expect(data).toEqual(mockData); }); const req = httpTestingController.expectOne('api/data'); expect(req.request.method).toBe('GET'); req.flush(mockData); httpTestingController.verify(); });

Real-world example (ShopNest)

ShopNest admin can be built in Angular with modules/components, services for API calls, and reactive forms for product edit.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: Angular CLI supports custom builders to extend build behavior. Create a Node.js package implementing the Builder interface. Define builder options and logic in a builders.json. Use the custom builder in angular.json for build or serve targets. Use case: Customized builds, code analysis, or special deployment pipelines.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: synchronously in Angular? Use Async Validators returning Observable<ValidationErrors | null>. ✅ function uniqueUsernameValidator(service: UserService): syncValidatorFn { return (control: AbstractControl): Observable<ValidationErrors | null> => { return service.checkUsername(control.value).pipe( map(isTaken => (isTaken ? {… uniqueUsername: true } :…… null)) ); }; } // Usage: new FormControl('', null,…

Explain a bit more

uniqueUsernameValidator(this.userService)); synchronously in Angular? synchronously in Angular? Use Async Validators returning Observable<ValidationErrors | null>. ✅

Example code

function uniqueUsernameValidator(service: UserService): syncValidatorFn { return (control: AbstractControl): Observable<ValidationErrors | null> => { return service.checkUsername(control.value).pipe( map(isTaken => (isTaken ? {… uniqueUsername: true } :… null)) ); }; } // Usage: new FormControl('', null, uniqueUsernameValidator(this.userService)); synchronously in Angular? synchronously in Angular? Use Async Validators returning Observable<ValidationErrors | null>. ✅ Example: function uniqueUsernameValidator(service: UserService): syncValidatorFn { return (control: AbstractControl): Observable<ValidationErrors | null> => { return service.checkUsername(control.value).pipe( map(isTaken => (isTaken ? { uniqueUsername: true } :… null)) ); }; } // Usage: new FormControl('', null, uniqueUsernameValidator(this.userService)); synchronously in Angular? Use Async Validators returning Observable<ValidationErrors | null>. ✅ Example: function uniqueUsernameValidator(service: UserService): syncValidatorFn { return (control: AbstractControl): Observable<ValidationErrors | null> => { return service.checkUsername(control.value).pipe( map(isTaken => (isTaken ? { uniqueUsername: true } : null)) ); }; } // Usage: new FormControl('', null, uniqueUsernameValidator(this.userService));

Real-world example (ShopNest)

ShopNest admin can be built in Angular with modules/components, services for API calls, and reactive forms for product edit.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: Implement a global error handler by extending Angular’s ErrorHandler class: @Injectable() export class GlobalErrorHandler implements ErrorHandler { handleError(error: any) { // log to server or show user notification console.error('Global error:', error); } } Provide it in your AppModule: providers: [{ provide: ErrorHandler, useClass: GlobalErrorHandler }] Can also use HTTP interceptors to catch API errors.

Real-world example (ShopNest)

ShopNest admin can be built in Angular with modules/components, services for API calls, and reactive forms for product edit.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: pplication? Implement a global error handler by extending Angular’s ErrorHandler class: @Injectable() export class GlobalErrorHandler implements ErrorHandler { handleError(error: any) { // log to server or show user notification console.error('Global error:', error); } } Provide it in your AppModule: providers: [{ provide: ErrorHandler,… useClass:……… pplication? pplication? Implement a global error handler by…

Explain a bit more

extending Angular’s ErrorHandler class: @Injectable() export class GlobalErrorHandler implements ErrorHandler { handleError(error: any) { // log to server or show user notification console.error('Global error:', error); } } Provide it in your AppModule: providers: [{ provide: ErrorHandler, useClass:… pplication? Implement a global error handler by extending Angular’s ErrorHandler class: @Injectable() export class GlobalErrorHandler implements ErrorHandler { handleError(error: any) { // log to server or show user notification console.error('Global error:', error); } } Provide it in your AppModule: providers: [{ provide:… pplication?…

Real-world example (ShopNest)

ShopNest admin can be built in Angular with modules/components, services for API calls, and reactive forms for product edit.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: Create a class with the @Pipe decorator implementing PipeTransform. Implement a transform() method with your logic. Example: @Pipe({ name: 'exclaim' }) export class ExclaimPipe implements PipeTransform { transform(value: string): string { return value + '!!!';

Example code

}
} Use in template: <p>{{ 'Hello' | exclaim }}</p> <!-- Outputs: Hello!!! -->

Real-world example (ShopNest)

ShopNest admin can be built in Angular with modules/components, services for API calls, and reactive forms for product edit.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: AOT compiles templates before runtime, improving startup performance. Enable via: ng build --aot Usually enabled automatically with --prod. Can be configured in angular.json: "configurations": { "production": { "aot": true }

Real-world example (ShopNest)

ShopNest admin can be built in Angular with modules/components, services for API calls, and reactive forms for product edit.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: Angular uses the fileReplacements option in angular.json.

Explain a bit more

You create environment files like environment.ts and environment.prod.ts. During build, Angular replaces the environment file based on the target configuration. Example in angular.json: "configurations": { "production": { "fileReplacements": [ { "replace": "src/environments/environment.ts", "with": "src/environments/environment.prod.ts" } } } Allows different API endpoints, debug flags, or configurations per environment. Best Practices

Real-world example (ShopNest)

ShopNest admin can be built in Angular with modules/components, services for API calls, and reactive forms for product edit.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: Angular modules (NgModules) are containers that group related components, directives, pipes, and services. Purpose: Organize code Enable lazy loading Manage dependencies

Example code

@NgModule({ declarations: [LoginComponent], imports: [CommonModule, FormsModule], exports: [LoginComponent] }) export class AuthModule {} Real-Time Example: AuthModule for login and registration AdminModule for dashboard, user management

Real-world example (ShopNest)

ShopNest admin can be built in Angular with modules/components, services for API calls, and reactive forms for product edit.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: Use the reset() method on FormGroup or NgForm.

Explain a bit more

✅ Examples: this.profileForm.reset(); myForm.resetForm(); You can also pass default values: this.profileForm.reset({ firstName: 'John', lastName: '' }); Summary Table: Concept Template-Driven Reactive Setup Use FormsModule, ngModel Use ReactiveFormsModule, FormGroup Validation Template-driven (HTML attrs) Programmatic with Validators Form Definition Implicit Explicit in TypeScript Custom Validation Limited Full control via functions Async Validation Not supported Supported with AsyncValidators Testing Harder Easier and more robust FormBuilder N/A Simplifies form creation Change Detection & Performance Optimization

Real-world example (ShopNest)

ShopNest admin can be built in Angular with modules/components, services for API calls, and reactive forms for product edit.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: Protractor is built on WebDriverJS for Angular E2E tests. Write test specs using Jasmine syntax. Run tests against a running Angular app. Example test: describe('App E2E Test', () => { it('should display welcome message', () => { browser.get('/'); expect(element(by.css('h1')).getText()).toEqual('Welcome'); }); }); Run with: ng e2e

Real-world example (ShopNest)

ShopNest admin can be built in Angular with modules/components, services for API calls, and reactive forms for product edit.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: Test form validity by setting control values and checking validity state.

Example code

it('should mark form invalid when empty', () => { component.form.controls['email'].setValue(''); expect(component.form.valid).toBeFalse(); }); it('should mark form valid with correct email', () => { component.form.controls['email'].setValue('test@example.com'); expect(component.form.valid).toBeTrue(); }); Advanced Angular Topics

Real-world example (ShopNest)

ShopNest admin can be built in Angular with modules/components, services for API calls, and reactive forms for product edit.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: Offload heavy computations or tasks to: Web Workers to run in background threads. ngZone.runOutsideAngular() to prevent triggering change detection unnecessarily. Use RxJS operators like debounce, throttle to optimize async streams. Break large tasks into smaller chunks. Miscellaneous Angular Concepts

Real-world example (ShopNest)

ShopNest admin can be built in Angular with modules/components, services for API calls, and reactive forms for product edit.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: ngular? Test form validity by setting control values and checking validity state. it('should mark form invalid when empty', () => { component.form.controls['email'].setValue(''); expect(component.form.valid).toBeFalse(); }); it('should mark form valid with correct email', () => {… component.form.controls['email'].setValue('test@example.com');…… expect(component.form.valid).toBeTrue(); }); dvanced Angular Topics…

Explain a bit more

ngular? ngular? Test form validity by setting control values and checking validity state.

Example code

it('should mark form invalid when empty', () => { component.form.controls['email'].setValue(''); expect(component.form.valid).toBeFalse(); }); it('should mark form valid with correct email', () => {… component.form.controls['email'].setValue('test@example.com');… expect(component.form.valid).toBeTrue(); }); dvanced Angular Topics ngular? ngular? Test form validity by setting control values and checking validity state. Example: it('should mark form invalid when empty', () => { component.form.controls['email'].setValue(''); expect(component.form.valid).toBeFalse(); }); it('should mark form valid with correct email', () => { component.form.controls['email'].setValue('test@example.com');… expect(component.form.valid).toBeTrue(); }); dvanced Angular Topics ngular? Test form validity by setting control values and checking validity state. Example: it('should mark form invalid when empty', () => { component.form.controls['email'].setValue(''); expect(component.form.valid).toBeFalse(); }); it('should mark form valid with correct email', () => { component.form.controls['email'].setValue('test@example.com'); expect(component.form.valid).toBeTrue(); }); dvanced Angular Topics

Real-world example (ShopNest)

ShopNest admin can be built in Angular with modules/components, services for API calls, and reactive forms for product edit.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.