Angular Interview Questions and Answers

  • By Pooja Ghodekar
  • March 4, 2024
  • Angular
Angular Interview Questions and Answers

Angular Interview Questions and Answers

Excel in Angular interviews with our curated collection of interview questions. Whether you’re a beginner or an experienced developer, dive into key Angular concepts, architecture, and best practices. In this blog, you will get expected the Angular Interview Questions and Answers for your job interview.

 What is Angular? How does it differ from AngularJS?

Angular is a platform and framework for building client-side web applications using TypeScript. It’s a complete rewrite of AngularJS (Angular 1.x) and offers significant improvements in performance, modularity, and developer experience.


Explain the key features of Angular.

Some key features of Angular include:

Modular architecture with components

Two-way data binding

Dependency injection

Directives (structural and attribute)

Services for code reuse and sharing

Routing and navigation

Forms and form validation

HTTP client module for making server requests


What is TypeScript? why is it used in Angular?

TypeScript is a superset of JavaScript that adds optional static typing, classes, and interfaces to JavaScript. It’s used in Angular to enhance developer productivity, provide better tooling and IDE support, and enable features like type checking and code refactoring.


What are the main components of an Angular application?

The main components of an Angular application are:

Modules: Organize the application into cohesive blocks of functionality.

Components: Building blocks of Angular applications that control parts of the UI.

Services: Reusable code for data processing, accessing APIs, etc.

Directives: Extend HTML with custom behavior or functionality.


What is data binding in Angular? Explain the different types of data binding.

  the automatic synchronization of data between the model and the view is nothing but data binding.

Types of data binding in Angular:

One-way data binding (from component to view or from view to component)

Two-way data binding (synchronization between model and view in both directions)

Event binding (handling DOM events in the view)

Property binding (setting element properties based on component data)

Components and Directives:


What is a component in Angular? How do you create a component?

A component is a TypeScript class with an associated HTML template and CSS styles that control a part of the UI.

Component is the basic building block of Angular applications.

You create a component using the Angular CLI command ng generate component <component-name>.


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Explain the lifecycle hooks in Angular components.

Lifecycle hooks are methods that Angular calls at certain points in the component’s lifecycle.

Some commonly used lifecycle hooks include ngOnInit, ngOnChanges, ngAfterViewInit, ngOnDestroy, etc.

These hooks allow you to perform initialization, cleanup, and respond to changes in the component.


What are Angular directives? Differentiate between structural and attribute directives.


Angular directives are markers on a DOM element that tell Angular to do something to that element.

Structural directives alter the structure of the DOM (e.g., *ngFor, *ngIf).

Attribute directives change the appearance or behavior of an element (e.g., ngClass, ngStyle).


How do you create custom directives in Angular?

You create custom directives in Angular by using the @Directive decorator.

Define a class that implements OnInit and OnDestroy interfaces (if needed).

Use @HostListener and @HostBinding decorators to listen to events and bind to element properties.

insert the directive to the declarations array of the Angular module.

Services and Dependency Injection:


What is a service in Angular? How do you create and use services?

A service in Angular is a singleton object that can be used to encapsulate and share data, logic, or functionality across components.

You create a service using the Angular CLI command ng generate service <service-name>.

Services are typically injected into components or other services using Angular’s dependency injection system.


 How we can inject a service into a component in Angular?

You inject a service into a component by declaring a constructor parameter of the service type in the component class.

Angular’s dependency injection system automatically provides an instance of the service when the component is created.

Angular’s injector hierarchy ensures that the component receives the appropriate instance of the service.


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Routing and Navigation:

What is routing in Angular? How do you configure routing in an Angular application?

Routing in Angular allows you to define navigation paths and views for different parts of your application.

You configure routing in an Angular application by importing the RouterModule and defining routes in the AppRoutingModule or individual feature modules.

Routes are defined using the RouterModule.forRoot() method and the RouterModule.forChild() method for feature modules.

Explain lazy loading in Angular routing and its benefits.

Lazy loading is a technique in which modules are loaded asynchronously when needed, rather than all at once when the application starts.

Lazy loading improves the initial loading time of the application by loading only the essential modules upfront and deferring the loading of other modules until they are required.

To lazy load modules in Angular routing, you use the loadChildren property in the route configuration.


How do you handle route parameters in Angular?

Route parameters are placeholders in the URL that are used to pass dynamic data to a route.

You define route parameters in the route path using the:paramName syntax.

In the component, you access route parameters using the ActivatedRoute service and the params observable.


Forms and Validation:

What are the different types of forms in Angular? Explain template-driven forms and reactive forms.

angular provide twi type of form template-driven forms and reactive forms.

Template-driven forms are created and managed by Angular based on directives added to the template.

Reactive forms are created programmatically using form controls and form groups.


How do you perform form validation in Angular?

Angular provides built-in validators such as required, minLength, maxLength, pattern, etc., that can be used to perform form validation.

You can apply validators to form controls either in the template or programmatically in the component.

Angular also provides async validators for performing asynchronous validation tasks.

Do watch our Components Of Angular video on YouTube.


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