Top 10 Angular Interview Questions for Beginners and Candidates with 0-2 Years of Experience | Prepare for Your Angular Interview

As a fresh graduate or someone with 0-2 years of experience in Angular development, preparing for an interview can be a daunting task. However, with the right preparation and practice, you can increase your chances of landing your dream job. To help you with your interview prep, here are the top 10 Angular interview questions for freshers and professionals with 0-2 years of experience:

1. What is Angular and how does it differ from AngularJS?
   Angular is a TypeScript-based open-source web application framework developed and maintained by Google. It is commonly used for building single-page applications (SPAs) and dynamic web applications. Angular is a complete rewrite of AngularJS, which is an older version of the framework. The main differences between Angular and AngularJS are the language used (Angular uses TypeScript, AngularJS uses JavaScript), the architecture (Angular introduces components and modules), and performance improvements (Angular is faster and more efficient).

2. What is the difference between Angular components and directives?
   Angular components are the building blocks of an Angular application and are used to create reusable UI elements. Components have their own template, styles, and behavior. Directives, on the other hand, are used to add behavior to existing elements in the DOM. Directives can be used to manipulate the DOM, apply styling, or modify behavior.

3. What are Angular modules and why are they important?
   Angular modules are used to consolidate components, directives, pipes, and services into cohesive blocks of functionality. Modules help organize the codebase and make it more maintainable. They also help with dependency injection and lazy loading of components, making the application more scalable and efficient.

4. What is data binding in Angular and what are the different types of data binding?
   Data binding in Angular is the automatic synchronization of data between the component class and the HTML template. There are four types of data binding in Angular:

   • Interpolation: {{ expression }}
   • Property binding: [property]="expression"
   • Event binding: (event)="expression"
   • Two-way binding: [(ngModel)]="property"

5. What is Angular CLI and how can it be used to generate a new Angular project?
   Angular CLI (Command Line Interface) is a command-line tool provided by Angular to streamline the development process. It can be used to generate a new Angular project, scaffold components, services, and modules, and run development and production builds. To generate a new Angular project using Angular CLI, you can run the following command:

   ng new project-name

6. What is dependency injection in Angular and why is it important?
   Dependency injection is a design pattern used in Angular to provide components with the necessary dependencies. It helps decouple components from their dependencies, making them more reusable and easier to test. Dependency injection in Angular is achieved using Angular’s built-in dependency injection system.

7. What are observables in Angular and how are they used?
   Observables are a part of the RxJS library and are used to work with asynchronous data streams in Angular. Observables can emit multiple values over time and can be subscribed to by components to receive these values. Observables are commonly used for making HTTP requests, handling user input, and managing state in Angular applications.

8. What is Angular routing and how is it implemented?
   Angular routing is used to navigate between different components in an Angular application. It allows users to switch between different views and maintain the application state. Routing in Angular is implemented using the RouterModule, which defines the routes and their corresponding components. Angular routing also supports lazy loading, which helps improve the performance of the application by loading components on demand.

9. What is Angular service and how is it different from a component?
   Angular services are used to encapsulate reusable functionality that can be shared across components in an Angular application. Services are singleton objects that are instantiated once and shared throughout the application. They are used to handle business logic, make HTTP requests, and manage application state. Components, on the other hand, are used to define the UI and presentation logic of the application.

10. What are the lifecycle hooks in Angular and how are they used?
    Angular provides a set of lifecycle hooks that allow developers to tap into different phases of a component’s lifecycle. Some of the most commonly used lifecycle hooks in Angular are:
    • ngOnChanges: called when a component’s input properties change
    • ngOnInit: called after the component is initialized
    • ngOnDestroy: called before the component is destroyed
    • ngAfterViewInit: called after the component’s view has been initialized

In conclusion, preparing for an Angular interview as a fresher or someone with 0-2 years of experience requires a solid understanding of the core concepts of Angular and practical experience working on Angular projects. By familiarizing yourself with the top 10 Angular interview questions outlined in this tutorial and practicing your answers, you can improve your chances of impressing potential employers and landing your dream job. Good luck!