Interview Q&A

Short answer: Angular Universal is a technology that enables Server-Side Rendering (SSR) of Angular applications. Instead of rendering the app purely in the browser (client-side), the initial HTML is rendered on the server and sent to the client. Improves SEO because search engines get fully rendered HTML content immediately, which they can index better. Also improves perceived performance and faster first paint.

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: Change detection is the mechanism Angular uses to update the DOM when the application's state changes. When data-bound properties change, Angular runs a change detection cycle to check if the view needs updating. It checks component data and updates the UI accordingly. Happens automatically after events, HTTP requests, timers, etc.

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: Feature Template-Driven Forms Reactive Forms Approach Declarative, based on directives in template Programmatic, model-driven in TypeScript Form Setup Mostly in HTML template Mostly in TypeScript code Validation Simple, template-based More powerful, reactive & scalable Form Control Implicitly created by Angular Explicitly created and managed Scalability Suitable for simple forms Best for complex forms Change…

Explain a bit more

Detection Asynchronous Synchronous Testing Harder to test Easier to unit test

Real-world example (ShopNest)

ShopNest’s ProductListComponent binds *ngFor to products and uses (click) to add to cart.

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 Ivy is the Angular next-generation rendering engine and compiler introduced officially in Angular 9.

Explain a bit more

It improves: Bundle size: Smaller generated code via better tree shaking and code generation. Build times: Faster incremental builds. Runtime performance: Faster rendering and change detection. Better debugging: More readable generated code and better error messages. Ivy enables partial compilation and supports new features like locality principle (compile only used components).

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 applications. Instead of rendering the app purely in the browser (client-side), the initial HTML is rendered on the server and sent to the client. Improves SEO because search engines get fully rendered HTML content immediately, which they can index better. Also improves perceived performance and faster first paint. Real-world example… (ShopNest)…… ShopNest admin can be built in Angular with…

Explain a bit more

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: wait TestBed.configureTestingModule({ declarations: [MyComponent] }).compileComponents(); fixture = TestBed.createComponent(MyComponent); component = fixture.componentInstance; fixture.detectChanges(); }); it('should create component', () => { expect(component).toBeTruthy(); }); wait TestBed.configureTestingModule({ declarations:… [MyComponent]…… }).compileComponents(); fixture =…

Explain a bit more

TestBed.createComponent(MyComponent); component = fixture.componentInstance; fixture.detectChanges(); }); it('should create component', () => { expect(component).toBeTruthy(); }); wait TestBed.configureTestingModule({ declarations: [MyComponent] }).compileComponents(); fixture = TestBed.createComponent(MyComponent); component = fixture.componentInstance; fixture.detectChanges(); }); it('should create component', () => { expect(component).toBeTruthy(); }); wait TestBed.configureTestingModule({ declarations:… [MyComponent] }).compileComponents(); fixture = TestBed.createComponent(MyComponent); component = fixture.componentInstance; fixture.detectChanges();…

Real-world example (ShopNest)

ShopNest’s ProductListComponent binds *ngFor to products and uses (click) to add to cart.

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: The Angular CLI (Command Line Interface) is a tool to generate, build, test, and maintain Angular apps efficiently. It automates repetitive tasks and enforces best practices. You can create a new Angular app with: ng new my-angular-app This command scaffolds a complete Angular project with all necessary files and configurations.

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: An Angular Module (NgModule) is a container to group related components, directives, pipes, and services. It organizes an Angular app into cohesive blocks of functionality. Helps with code organization, compilation, dependency injection, and lazy loading. Every Angular app has at least one root module (AppModule).

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's state changes. When data-bound properties change, Angular runs a change detection cycle to check if the view needs updating. It checks component data and updates the UI accordingly. Happens automatically after events, HTTP requests, timers, etc.

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: pproach Declarative, based on directives in template Programmatic, model-driven in TypeScript Form Setup Mostly in HTML template Mostly in TypeScript code Validation Simple, template-based More powerful, reactive & scalable Form Control Implicitly created by Angular Explicitly created and managed Scalability Suitable for simple forms Best for… complex…… forms… Change Detection synchronous Synchronous Testing Harder…

Real-world example (ShopNest)

ShopNest’s ProductListComponent binds *ngFor to products and uses (click) to add to cart.

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 is a TypeScript-based open-source front-end web application framework developed by Google for building single-page applications (SPAs).

Explain a bit more

Key Differences: Feature AngularJS (v1.x) Angular (2+) Language JavaScript TypeScript Architecture MVC (Model-View-Controller) Component-based Mobile Support No Yes Performance Slower due to two-way binding Faster with unidirectional data flow Dependency Injection Limited Robust and built-in Real-Time

Example code

AngularJS was used in legacy projects (e.g., dashboards in older admin panels). Angular is used in modern SPAs like Google Ads, Gmail, Netflix dashboards, etc.

Real-world example (ShopNest)

A shared CartService is injected into header and product pages so both see the same cart count.

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: ng serve builds and launches a development server that hosts your app locally. It watches for file changes and automatically reloads the app (live-reload). Useful during development for rapid testing. ng serve

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: SSR means rendering the app’s HTML on the server before sending it to the client. With Angular Universal, the app runs on Node.js server rendering Angular components into HTML. The client then takes over via Angular’s client-side rendering (hydration).

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? ng serve builds and launches a development server that hosts your app locally. It watches for file changes and automatically reloads the app (live-reload). Useful during development for rapid testing. ng serve

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: @NgModule is a decorator that defines a module. It declares which components, directives, and pipes belong to the module. It imports other modules needed for its components. It exports components/modules to make them available elsewhere. It configures services/providers scoped to the module.

Example code

@NgModule({ declarations: [MyComponent, MyDirective], imports: [CommonModule], exports: [MyComponent] }) export class MyModule {}

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: Change Detection Strategy Description When to Use Default Angular checks every component in the component tree every cycle Simple apps or components with frequent changes OnPush Angular checks component only if input references change or events Optimizes performance, suitable for immutable data & smart components How to set OnPush: @Component({ selector: 'app-example', changeDetection:…

Explain a bit more

ChangeDetectionStrategy.OnPush, template: `...` }) export class ExampleComponent {} Key Difference: Default: Runs change detection every time. OnPush: Runs only when inputs change by reference or manual trigger.

Real-world example (ShopNest)

A shared CartService is injected into header and product pages so both see the same cart count.

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: The Angular compiler converts Angular templates and TypeScript code into efficient JavaScript code. There are two modes: JIT (Just-in-Time): Compilation happens in the browser at runtime. AOT (Ahead-of-Time): Compilation happens during the build phase, producing optimized JS files. It processes: Templates → render functions Metadata → static code to improve runtime Ivy compiler is the latest Angular compiler.

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: TestBed is the primary API to configure and initialize the environment for unit testing Angular components and services. It allows you to declare components, provide services, import modules, and compile templates.

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: trackBy is a function used with *ngFor to tell Angular how to track list items uniquely. Why it matters: Without trackBy, Angular recreates DOM elements on each update, causing performance overhead. ✅

Example code

<div *ngFor="let item of items; trackBy: trackById"> {{ item.name }} </div> trackById(index: number, item: any) { return item.id; // unique id per item } Angular reuses existing DOM elements instead of recreating them.

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 loads feature modules only when needed (e.g., when a user navigates to a route). Benefits: Reduces initial bundle size → faster app startup. Improves performance and user experience. Enables better code splitting and modularity. Angular supports lazy loading via dynamic route configuration: { path: 'products', loadChildren: () => import('./products/products.module').then(m => m.ProductsModule) }

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: JWT is a compact, URL-safe token format that securely transmits information between parties. Contains a payload with user info and claims, digitally signed. Angular apps use JWT to: Store authentication state. Send it with API requests to authorize access. Decode JWT to get user roles, expiry, etc.

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: Comman Purpose ng serve Builds app in memory, runs a dev server, watches files, reloads on changes (for development) ng build Builds app to disk, generates production or development-ready output files

Real-world example (ShopNest)

A shared CartService is injected into header and product pages so both see the same cart count.

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: CommonModule provides common directives like *ngIf, *ngFor, ngClass, etc. You import it in feature modules or any module other than the root module. Don’t import BrowserModule in feature modules; instead, import CommonModule there.

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 reuses existing DOM elements instead of recreating them.

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: Definition: A Burndown Chart is a visual tool that shows the remaining work in a Sprint or project over time. Purpose: Helps teams monitor progress toward completing the Sprint backlog. Enables early identification of scope creep or falling behind. Follow On: How to use: X-axis: Days in Sprint Y-axis: Remaining effort (usually in story points or hours) Ideal line vs. actual line

Example code

Midway through a Sprint, a team sees the burndown flatlining (no work is getting “done”). This prompts a conversation — they discover a blocker in API access and address it before the Sprint is derailed. Scrum Implementation & Best Practices:

Real-world example (ShopNest)

Agile for ShopNest means ship a thin checkout slice every sprint, get feedback, then improve—not a 6-month big-bang release.

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.