Angular Subtopics for Exam Preparation

Q1 What is AngularJS and how does it differ from Angular? Beginner AngularJS (Angular 1.x) is a JavaScript-based open-source front-end framework created by Google. It follows MVC architecture and supports two-way data binding using scope. Angular (2+) is a mod

Master AngularJS Interview Questions with Clear Answers, Examples, and Modern Concepts

What is AngularJS and how does it differ from Angular?

Beginner

AngularJS (Angular 1.x) is a JavaScript-based open-source front-end framework created by Google. It follows MVC architecture and supports two-way data binding using scope.

Angular (2+) is a modern rewrite built with TypeScript. It uses a component-based architecture, has better performance, improved tooling, and a more scalable structure for modern applications.

Feature	AngularJS	Angular
Language	JavaScript	TypeScript
Architecture	MVC	Component-based
Data Binding	Two-way	One-way + events
Performance	Older and slower	Faster and modern

#AngularJS vs Angular #Angular architecture #Angular interview

What are Angular Components? Explain with an example.

Beginner

A Component is the main building block of Angular UI. Each component controls a part of the screen and includes template, logic, metadata, and styles.

Template – HTML view
Class – TypeScript logic
Metadata – @Component decorator
Styles – component-specific CSS

@Component({
  selector: 'app-hello',
  template: `<h1>Hello, {{ name }}!</h1>`
})
export class HelloComponent {
  name: string = 'Angular';
}

#Angular components #Component decorator #Angular UI

What is Data Binding in Angular? Explain all types.

Beginner

Data binding connects component data with the UI. Angular supports multiple binding types to pass data between the view and component.

Type	Syntax	Direction
Interpolation	{{ value }}	Component to View
Property Binding	[property]="value"	Component to View
Event Binding	(event)="handler()"	View to Component
Two-way Binding	[(ngModel)]="value"	Both directions

#Data binding #ngModel #Angular basics

What are Directives in Angular? Explain types with examples.

Beginner

Directives let you extend or change the behavior of HTML elements in Angular.

Component Directives – directives with template
Structural Directives – modify DOM structure like *ngIf and *ngFor
Attribute Directives – change appearance or behavior like ngClass

#Angular directives #ngIf #ngFor

What is Dependency Injection in Angular?

Beginner

Dependency Injection (DI) is a design pattern where a class gets the services or dependencies it needs from outside, instead of creating them itself. Angular uses a built-in DI system to make applications cleaner and more reusable.

#Dependency Injection #Angular services #Injectable

What is an Angular Module (NgModule)?

Beginner

An NgModule is a container that groups related components, directives, pipes, and services. It helps organize Angular applications into functional sections.

Tip: In modern Angular, standalone components are becoming more common, but NgModule is still a very common interview topic.

#NgModule #Angular architecture #AppModule

What is the Angular Component Lifecycle?

Beginner

Angular components move through different lifecycle stages from creation to destruction. Angular provides lifecycle hooks to run custom logic at each stage.

Hook	Purpose
ngOnChanges	Runs when input changes
ngOnInit	Runs after component initialization
ngDoCheck	Custom change detection
ngAfterViewInit	Runs after view initialization
ngOnDestroy	Runs before destroy

#Lifecycle hooks #ngOnInit #ngOnDestroy

What are Angular Pipes? How do you create a custom pipe?

Beginner

Pipes transform data in templates for display. Angular provides built-in pipes such as date, currency, uppercase, and async. You can also create custom pipes to format values your own way.

#Angular pipes #Custom pipe #Async pipe

What is Angular Routing and how do you set it up?

Intermediate

Angular Routing allows navigation between different views or components in a single-page application. It is set up using the Angular Router and route configuration.

#Angular routing #RouterModule #SPA navigation

Q10

What is Lazy Loading in Angular? Why is it important?

Intermediate

Lazy Loading means loading feature modules only when they are needed. This reduces initial bundle size and improves app loading performance.

Why important: it improves startup speed, reduces unnecessary downloads, and makes large Angular apps more efficient.

#Lazy loading #Angular performance #Code splitting

Q11

What is RxJS and how is it used in Angular?

Intermediate

RxJS is a library for reactive programming using Observables. Angular uses RxJS heavily for HTTP requests, event streams, async data handling, and state-based interactions.

this.http.get<User[]>('/api/users')
  .pipe(
    map(users => users.filter(user => user.active))
  )
  .subscribe(result => console.log(result));

#RxJS Angular #Observable #Reactive programming

Q12

What is the difference between Observable and Promise?

Intermediate

Feature	Observable	Promise
Values	Multiple values over time	Single value
Lazy / Eager	Lazy	Eager
Cancellation	Yes	No
Operators	Rich operators	Limited chaining

Observables are more powerful in Angular because they work naturally with streams, retries, cancellation, and operators.

#Observable vs Promise #Angular async #RxJS

Q13

What is Angular HttpClient? How do you make HTTP requests?

Intermediate

HttpClient is Angular’s built-in module for making HTTP requests. It supports GET, POST, PUT, DELETE, typed responses, interceptors, and RxJS Observables.

constructor(private http: HttpClient) {}

getUsers() {
  return this.http.get<User[]>('/api/users');
}

createUser(user: User) {
  return this.http.post('/api/users', user);
}

#Angular HttpClient #API calls #Angular REST

Q14

What are Angular Guards? Explain CanActivate and CanDeactivate.

Intermediate

CanActivate – decides whether a user can access a route
CanDeactivate – decides whether a user can leave a route
CanLoad – controls lazy-loaded modules
Resolve – preloads data before opening the route

canActivate(): boolean {
  if (this.auth.isLoggedIn()) return true;
  this.router.navigate(['/login']);
  return false;
}

#Angular guards #CanActivate #Route protection

Q15

What is Change Detection in Angular? What are strategies?

Intermediate

Change Detection is the process Angular uses to update the DOM when component data changes. The two main strategies are Default and OnPush.

Strategy	Behavior
Default	Checks more often, easier to use
OnPush	More optimized, runs on reference changes and explicit triggers

#Change detection #OnPush #Angular performance

Q16

What are Angular Services and how do they differ from Components?

Intermediate

	Service	Component
Purpose	Business logic / shared logic	UI rendering
Template	No	Yes
Reuse	High	UI-focused

#Angular services #Service vs Component #Injectable

Q17

What are Angular Forms? Explain Template-Driven vs Reactive Forms.

Intermediate

Feature	Template-Driven	Reactive
Logic	In template	In component class
Best for	Simple forms	Complex forms
Testing	Harder	Easier

#Angular forms #Reactive forms #Template-driven

Q18

What are HTTP Interceptors in Angular?

Intermediate

HTTP Interceptors let you inspect or modify requests and responses globally. They are often used for auth tokens, logging, centralized error handling, and loaders.

#HTTP interceptor #JWT token #Global error handling

Q19

What is @Input() and @Output() in Angular?

Intermediate

@Input() sends data from parent to child. @Output() sends events from child to parent using an EventEmitter.

@Input() title: string;
@Output() clicked = new EventEmitter<string>();

#Input Output #Parent child communication #EventEmitter

Q20

What is ViewChild and ContentChild in Angular?

Intermediate

ViewChild lets you access a child component, directive, or DOM element inside the component’s own template. ContentChild lets you access projected content passed through ng-content.

#ViewChild #ContentChild #DOM access

Q21

What is Angular Ivy? What are its benefits?

Advanced

Smaller bundle sizes
Faster compilation
Better debugging
Improved template type checking
Helps modern Angular features work better

#Angular Ivy #Compilation #Performance

Q22

What are Standalone Components in Angular?

Advanced

Standalone Components are Angular components that do not need an NgModule. They directly declare their own dependencies through the imports array.

#Standalone components #Modern Angular #bootstrapApplication

Q23

What is NgRx? When would you use it?

Advanced

NgRx is a Redux-style state management library for Angular. It is useful in large applications where many components need to share predictable state.

Use NgRx when your application has complex shared state, multiple async flows, and you want predictable data updates.

#NgRx #State management #Redux Angular

Q24

What are Angular Signals? Explain the new reactivity model.

Advanced

Angular Signals are a newer reactivity model that updates dependent values when data changes. They help Angular track changes in a more fine-grained and modern way.

count = signal(0);
doubled = computed(() => this.count() * 2);

#Angular Signals #Reactivity #Computed signals

Q25

What is Angular Universal (SSR)? Why use Server-Side Rendering?

Advanced

Better SEO
Faster first contentful paint
Improved Core Web Vitals
Better social sharing previews

ng add @angular/ssr

#Angular Universal #SSR #Angular SEO

Q26

What are Angular Resolvers? How do they work?

Advanced

A Resolver is a route service that fetches data before the route is activated, so the component gets ready-to-use data when it loads.

resolve(route: ActivatedRouteSnapshot) {
  return this.userService.getUser(route.params['id']);
}

#Angular resolver #Pre-fetch data #Route data loading

Q27

What is the async pipe in Angular? When should you use it?

Intermediate

The async pipe subscribes to an Observable or Promise and returns the latest value. It also automatically unsubscribes when the component is destroyed, helping prevent memory leaks.

users$ = this.http.get<User[]>('/api/users');

<div *ngFor="let user of users$ | async">
  {{ user.name }}
</div>

Best practice: prefer the async pipe over manual subscription in templates when possible.

#Async pipe #Memory leak prevention #Angular best practices

Q28

What is ng-template, ng-container, and ng-content?

Intermediate

Element	Purpose
ng-template	Reusable template fragment, not rendered directly
ng-container	Logical wrapper without extra DOM
ng-content	Content projection into a component

<ng-container *ngIf="isAdmin">
  <button>Delete</button>
</ng-container>

<app-card>
  <p>Projected content here</p>
</app-card>

#ng-template #ng-container #ng-content

Q29

What is trackBy in Angular and why should you use it with ngFor?

Intermediate

trackBy helps Angular identify list items uniquely when rendering with *ngFor. It improves performance by avoiding unnecessary DOM re-creation.

#trackBy #ngFor performance

Q30

What is Ahead-of-Time (AOT) compilation in Angular?

Advanced

AOT compilation converts Angular templates and components into efficient JavaScript during build time, leading to faster rendering and earlier template error detection.

#AOT #Angular build optimization

Q31

What is Just-in-Time (JIT) compilation in Angular?

Advanced

JIT compilation compiles the application in the browser during runtime. It is useful in development, but AOT is generally preferred for production performance.

#JIT #Angular compilation

Q32

What is the difference between constructor and ngOnInit?

Intermediate

The constructor is used for dependency injection and basic setup. ngOnInit is used for component initialization logic after Angular sets input properties.

#constructor vs ngOnInit #Lifecycle

Q33

What is the difference between Subject, BehaviorSubject, and ReplaySubject?

Advanced

Subject emits to current subscribers only. BehaviorSubject keeps the latest value and gives it to new subscribers. ReplaySubject replays previous values to new subscribers.

#Subject #BehaviorSubject #ReplaySubject

Q34

What is zone.js in Angular?

Advanced

zone.js helps Angular detect async operations and know when to trigger change detection automatically.

#zone.js #Change detection

Q35

What is content projection in Angular?

Intermediate

Content projection allows you to pass external content into a component using ng-content. It is similar to slots in web components.

#Content projection #ng-content

Q36

What is a custom directive in Angular?

Intermediate

A custom directive lets you create reusable behavior that can be attached to elements, such as highlighting, access control, or interaction handling.

#Custom directive #Angular directives

Q37

How do you optimize performance in Angular applications?

Advanced

Use lazy loading
Use OnPush change detection
Use trackBy with ngFor
Avoid unnecessary subscriptions
Use async pipe where possible
Split large components

#Angular performance #Lazy loading #OnPush

Q38

What is dependency injection hierarchy in Angular?

Advanced

Angular resolves services using an injector hierarchy. A service can be provided at the root, module, component, or directive level, which affects its scope and instance sharing.

#DI hierarchy #Angular injector

Q39

What is a pure pipe vs impure pipe in Angular?

Advanced

A pure pipe runs only when input references change. An impure pipe runs on every change detection cycle and can be more expensive.

#Pure pipe #Impure pipe

Q40

How do you handle errors in Angular applications?

Advanced

Use Http Interceptors for API errors
Use try/catch where appropriate
Use RxJS catchError
Create reusable error UI
Log important issues centrally

#Angular error handling #catchError #HTTP interceptor

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Angular Subtopics for Exam Preparation

Master AngularJS Interview Questions with Clear Answers, Examples, and Modern Concepts

What is AngularJS and how does it differ from Angular?

Beginner

Feature	AngularJS	Angular
Language	JavaScript	TypeScript
Architecture	MVC	Component-based
Data Binding	Two-way	One-way + events
Performance	Older and slower	Faster and modern

#AngularJS vs Angular #Angular architecture #Angular interview

What are Angular Components? Explain with an example.

Beginner

A Component is the main building block of Angular UI. Each component controls a part of the screen and includes template, logic, metadata, and styles.

Template – HTML view
Class – TypeScript logic
Metadata – @Component decorator
Styles – component-specific CSS

@Component({
  selector: 'app-hello',
  template: `<h1>Hello, {{ name }}!</h1>`
})
export class HelloComponent {
  name: string = 'Angular';
}

#Angular components #Component decorator #Angular UI

What is Data Binding in Angular? Explain all types.

Beginner

Data binding connects component data with the UI. Angular supports multiple binding types to pass data between the view and component.

Type	Syntax	Direction
Interpolation	{{ value }}	Component to View
Property Binding	[property]="value"	Component to View
Event Binding	(event)="handler()"	View to Component
Two-way Binding	[(ngModel)]="value"	Both directions

#Data binding #ngModel #Angular basics

What are Directives in Angular? Explain types with examples.

Beginner

Directives let you extend or change the behavior of HTML elements in Angular.

Component Directives – directives with template
Structural Directives – modify DOM structure like *ngIf and *ngFor
Attribute Directives – change appearance or behavior like ngClass

#Angular directives #ngIf #ngFor

What is Dependency Injection in Angular?

Beginner

#Dependency Injection #Angular services #Injectable

What is an Angular Module (NgModule)?

Beginner

An NgModule is a container that groups related components, directives, pipes, and services. It helps organize Angular applications into functional sections.

Tip: In modern Angular, standalone components are becoming more common, but NgModule is still a very common interview topic.

#NgModule #Angular architecture #AppModule

What is the Angular Component Lifecycle?

Beginner

Angular components move through different lifecycle stages from creation to destruction. Angular provides lifecycle hooks to run custom logic at each stage.

Hook	Purpose
ngOnChanges	Runs when input changes
ngOnInit	Runs after component initialization
ngDoCheck	Custom change detection
ngAfterViewInit	Runs after view initialization
ngOnDestroy	Runs before destroy

#Lifecycle hooks #ngOnInit #ngOnDestroy

What are Angular Pipes? How do you create a custom pipe?

Beginner

Pipes transform data in templates for display. Angular provides built-in pipes such as date, currency, uppercase, and async. You can also create custom pipes to format values your own way.

#Angular pipes #Custom pipe #Async pipe

What is Angular Routing and how do you set it up?

Intermediate

Angular Routing allows navigation between different views or components in a single-page application. It is set up using the Angular Router and route configuration.

#Angular routing #RouterModule #SPA navigation

Q10

What is Lazy Loading in Angular? Why is it important?

Intermediate

Lazy Loading means loading feature modules only when they are needed. This reduces initial bundle size and improves app loading performance.

Why important: it improves startup speed, reduces unnecessary downloads, and makes large Angular apps more efficient.

#Lazy loading #Angular performance #Code splitting

Q11

What is RxJS and how is it used in Angular?

Intermediate

RxJS is a library for reactive programming using Observables. Angular uses RxJS heavily for HTTP requests, event streams, async data handling, and state-based interactions.

this.http.get<User[]>('/api/users')
  .pipe(
    map(users => users.filter(user => user.active))
  )
  .subscribe(result => console.log(result));

#RxJS Angular #Observable #Reactive programming

Q12

What is the difference between Observable and Promise?

Intermediate

Feature	Observable	Promise
Values	Multiple values over time	Single value
Lazy / Eager	Lazy	Eager
Cancellation	Yes	No
Operators	Rich operators	Limited chaining

Observables are more powerful in Angular because they work naturally with streams, retries, cancellation, and operators.

#Observable vs Promise #Angular async #RxJS

Q13

What is Angular HttpClient? How do you make HTTP requests?

Intermediate

HttpClient is Angular’s built-in module for making HTTP requests. It supports GET, POST, PUT, DELETE, typed responses, interceptors, and RxJS Observables.

constructor(private http: HttpClient) {}

getUsers() {
  return this.http.get<User[]>('/api/users');
}

createUser(user: User) {
  return this.http.post('/api/users', user);
}

#Angular HttpClient #API calls #Angular REST

Q14

What are Angular Guards? Explain CanActivate and CanDeactivate.

Intermediate

CanActivate – decides whether a user can access a route
CanDeactivate – decides whether a user can leave a route
CanLoad – controls lazy-loaded modules
Resolve – preloads data before opening the route

canActivate(): boolean {
  if (this.auth.isLoggedIn()) return true;
  this.router.navigate(['/login']);
  return false;
}

#Angular guards #CanActivate #Route protection

Q15

What is Change Detection in Angular? What are strategies?

Intermediate

Change Detection is the process Angular uses to update the DOM when component data changes. The two main strategies are Default and OnPush.

Strategy	Behavior
Default	Checks more often, easier to use
OnPush	More optimized, runs on reference changes and explicit triggers

#Change detection #OnPush #Angular performance

Q16

What are Angular Services and how do they differ from Components?

Intermediate

	Service	Component
Purpose	Business logic / shared logic	UI rendering
Template	No	Yes
Reuse	High	UI-focused

#Angular services #Service vs Component #Injectable

Q17

What are Angular Forms? Explain Template-Driven vs Reactive Forms.

Intermediate

Feature	Template-Driven	Reactive
Logic	In template	In component class
Best for	Simple forms	Complex forms
Testing	Harder	Easier

#Angular forms #Reactive forms #Template-driven

Q18

What are HTTP Interceptors in Angular?

Intermediate

HTTP Interceptors let you inspect or modify requests and responses globally. They are often used for auth tokens, logging, centralized error handling, and loaders.

#HTTP interceptor #JWT token #Global error handling

Q19

What is @Input() and @Output() in Angular?

Intermediate

@Input() sends data from parent to child. @Output() sends events from child to parent using an EventEmitter.

@Input() title: string;
@Output() clicked = new EventEmitter<string>();

#Input Output #Parent child communication #EventEmitter

Q20

What is ViewChild and ContentChild in Angular?

Intermediate

ViewChild lets you access a child component, directive, or DOM element inside the component’s own template. ContentChild lets you access projected content passed through ng-content.

#ViewChild #ContentChild #DOM access

Q21

What is Angular Ivy? What are its benefits?

Advanced

Smaller bundle sizes
Faster compilation
Better debugging
Improved template type checking
Helps modern Angular features work better

#Angular Ivy #Compilation #Performance

Q22

What are Standalone Components in Angular?

Advanced

Standalone Components are Angular components that do not need an NgModule. They directly declare their own dependencies through the imports array.

#Standalone components #Modern Angular #bootstrapApplication

Q23

What is NgRx? When would you use it?

Advanced

NgRx is a Redux-style state management library for Angular. It is useful in large applications where many components need to share predictable state.

Use NgRx when your application has complex shared state, multiple async flows, and you want predictable data updates.

#NgRx #State management #Redux Angular

Q24

What are Angular Signals? Explain the new reactivity model.

Advanced

Angular Signals are a newer reactivity model that updates dependent values when data changes. They help Angular track changes in a more fine-grained and modern way.

count = signal(0);
doubled = computed(() => this.count() * 2);

#Angular Signals #Reactivity #Computed signals

Q25

What is Angular Universal (SSR)? Why use Server-Side Rendering?

Advanced

Better SEO
Faster first contentful paint
Improved Core Web Vitals
Better social sharing previews

ng add @angular/ssr

#Angular Universal #SSR #Angular SEO

Q26

What are Angular Resolvers? How do they work?

Advanced

A Resolver is a route service that fetches data before the route is activated, so the component gets ready-to-use data when it loads.

resolve(route: ActivatedRouteSnapshot) {
  return this.userService.getUser(route.params['id']);
}

#Angular resolver #Pre-fetch data #Route data loading

Q27

What is the async pipe in Angular? When should you use it?

Intermediate

The async pipe subscribes to an Observable or Promise and returns the latest value. It also automatically unsubscribes when the component is destroyed, helping prevent memory leaks.

users$ = this.http.get<User[]>('/api/users');

<div *ngFor="let user of users$ | async">
  {{ user.name }}
</div>

Best practice: prefer the async pipe over manual subscription in templates when possible.

#Async pipe #Memory leak prevention #Angular best practices

Q28

What is ng-template, ng-container, and ng-content?

Intermediate

Element	Purpose
ng-template	Reusable template fragment, not rendered directly
ng-container	Logical wrapper without extra DOM
ng-content	Content projection into a component

<ng-container *ngIf="isAdmin">
  <button>Delete</button>
</ng-container>

<app-card>
  <p>Projected content here</p>
</app-card>

#ng-template #ng-container #ng-content

Q29

What is trackBy in Angular and why should you use it with ngFor?

Intermediate

trackBy helps Angular identify list items uniquely when rendering with *ngFor. It improves performance by avoiding unnecessary DOM re-creation.

#trackBy #ngFor performance

Q30

What is Ahead-of-Time (AOT) compilation in Angular?

Advanced

AOT compilation converts Angular templates and components into efficient JavaScript during build time, leading to faster rendering and earlier template error detection.

#AOT #Angular build optimization

Q31

What is Just-in-Time (JIT) compilation in Angular?

Advanced

JIT compilation compiles the application in the browser during runtime. It is useful in development, but AOT is generally preferred for production performance.

#JIT #Angular compilation

Q32

What is the difference between constructor and ngOnInit?

Intermediate

The constructor is used for dependency injection and basic setup. ngOnInit is used for component initialization logic after Angular sets input properties.

#constructor vs ngOnInit #Lifecycle

Q33

What is the difference between Subject, BehaviorSubject, and ReplaySubject?

Advanced

Subject emits to current subscribers only. BehaviorSubject keeps the latest value and gives it to new subscribers. ReplaySubject replays previous values to new subscribers.

#Subject #BehaviorSubject #ReplaySubject

Q34

What is zone.js in Angular?

Advanced

zone.js helps Angular detect async operations and know when to trigger change detection automatically.

#zone.js #Change detection

Q35

What is content projection in Angular?

Intermediate

Content projection allows you to pass external content into a component using ng-content. It is similar to slots in web components.

#Content projection #ng-content

Q36

What is a custom directive in Angular?

Intermediate

A custom directive lets you create reusable behavior that can be attached to elements, such as highlighting, access control, or interaction handling.

#Custom directive #Angular directives

Q37

How do you optimize performance in Angular applications?

Advanced

Use lazy loading
Use OnPush change detection
Use trackBy with ngFor
Avoid unnecessary subscriptions
Use async pipe where possible
Split large components

#Angular performance #Lazy loading #OnPush

Q38

What is dependency injection hierarchy in Angular?

Advanced

Angular resolves services using an injector hierarchy. A service can be provided at the root, module, component, or directive level, which affects its scope and instance sharing.

#DI hierarchy #Angular injector

Q39

What is a pure pipe vs impure pipe in Angular?

Advanced

A pure pipe runs only when input references change. An impure pipe runs on every change detection cycle and can be more expensive.

#Pure pipe #Impure pipe

Q40

How do you handle errors in Angular applications?

Advanced

Use Http Interceptors for API errors
Use try/catch where appropriate
Use RxJS catchError
Create reusable error UI
Log important issues centrally

#Angular error handling #catchError #HTTP interceptor

Angular Subtopics for Exam Preparation

Master AngularJS Interview Questions with Clear Answers, Examples, and Modern Concepts

What is AngularJS and how does it differ from Angular?

What are Angular Components? Explain with an example.

What is Data Binding in Angular? Explain all types.

What are Directives in Angular? Explain types with examples.

What is Dependency Injection in Angular?

What is an Angular Module (NgModule)?

What is the Angular Component Lifecycle?

What are Angular Pipes? How do you create a custom pipe?

What is Angular Routing and how do you set it up?

What is Lazy Loading in Angular? Why is it important?

What is RxJS and how is it used in Angular?

What is the difference between Observable and Promise?

What is Angular HttpClient? How do you make HTTP requests?

What are Angular Guards? Explain CanActivate and CanDeactivate.

What is Change Detection in Angular? What are strategies?

What are Angular Services and how do they differ from Components?

What are Angular Forms? Explain Template-Driven vs Reactive Forms.

What are HTTP Interceptors in Angular?

What is @Input() and @Output() in Angular?

What is ViewChild and ContentChild in Angular?

What is Angular Ivy? What are its benefits?

What are Standalone Components in Angular?

What is NgRx? When would you use it?

What are Angular Signals? Explain the new reactivity model.

What is Angular Universal (SSR)? Why use Server-Side Rendering?

What are Angular Resolvers? How do they work?

What is the async pipe in Angular? When should you use it?

What is ng-template, ng-container, and ng-content?

What is trackBy in Angular and why should you use it with ngFor?

What is Ahead-of-Time (AOT) compilation in Angular?

What is Just-in-Time (JIT) compilation in Angular?

What is the difference between constructor and ngOnInit?

What is the difference between Subject, BehaviorSubject, and ReplaySubject?

What is zone.js in Angular?

What is content projection in Angular?

What is a custom directive in Angular?

How do you optimize performance in Angular applications?

What is dependency injection hierarchy in Angular?

What is a pure pipe vs impure pipe in Angular?

How do you handle errors in Angular applications?

Top angular js interview questions

Similar Topics

Top 5 Topics

Top 5 Categories

Angular Subtopics for Exam Preparation

Master AngularJS Interview Questions with Clear Answers, Examples, and Modern Concepts

What is AngularJS and how does it differ from Angular?

What are Angular Components? Explain with an example.

What is Data Binding in Angular? Explain all types.

What are Directives in Angular? Explain types with examples.

What is Dependency Injection in Angular?

What is an Angular Module (NgModule)?

What is the Angular Component Lifecycle?

What are Angular Pipes? How do you create a custom pipe?

What is Angular Routing and how do you set it up?

What is Lazy Loading in Angular? Why is it important?

What is RxJS and how is it used in Angular?

What is the difference between Observable and Promise?

What is Angular HttpClient? How do you make HTTP requests?

What are Angular Guards? Explain CanActivate and CanDeactivate.

What is Change Detection in Angular? What are strategies?

What are Angular Services and how do they differ from Components?

What are Angular Forms? Explain Template-Driven vs Reactive Forms.

What are HTTP Interceptors in Angular?

What is @Input() and @Output() in Angular?

What is ViewChild and ContentChild in Angular?

What is Angular Ivy? What are its benefits?

What are Standalone Components in Angular?

What is NgRx? When would you use it?

What are Angular Signals? Explain the new reactivity model.

What is Angular Universal (SSR)? Why use Server-Side Rendering?

What are Angular Resolvers? How do they work?

What is the async pipe in Angular? When should you use it?

What is ng-template, ng-container, and ng-content?

What is trackBy in Angular and why should you use it with ngFor?

What is Ahead-of-Time (AOT) compilation in Angular?

What is Just-in-Time (JIT) compilation in Angular?

What is the difference between constructor and ngOnInit?