Angular Interview questions & answers

Angular JS continues to be a top programming language for web developers since 2019, making now the perfect time to become an Angular developer. Many companies are actively seeking skilled Angular programmers.

If you’re applying for Angular roles, be ready to tackle some Angular-specific questions in your interviews, along with coding tests. To help you prepare, we’ve gathered some of the most common Angular interview questions you should expect this year.

Common Angular Interview Questions

The interview will start with some general questions about Angular concepts.

What is Angular?

Angular is a TypeScript-based open-source web application framework developed and maintained by Google. It simplifies the development of web applications by integrating features such as dependency injection, declarative templates, and end-to-end tooling.

Mention some Angular features

Angular is an ideal front-end JavaScript framework because it:

• Enables the creation of accessible applications with ARIA-enabled components and built-in accessibility test infrastructure.
• Supports command-line interface tools for easy component addition, deployment, testing, etc.
• Provides Animation Support with an intuitive API to create complex animations with minimal code.
• Supports Cross-Platform App Development, allowing you to build desktop and progressive web apps.
• Offers Code Generation that turns templates into highly optimized code for modern JavaScript VMs.
• Features Code Splitting with its Component Router, improving load times.
• Integrates well with popular code editors and IDEs, improving development efficiency.

What are the advantages and disadvantages of using Angular?

Advantages include:

• Support for dependency injection, validations, and RESTful services.
• Two-way data-binding.
• Use of the MVC pattern architecture.
• Robust features like animations and event handlers.
• Strong community support.

Disadvantages are:

• Steep learning curve.
• Potential performance issues with dynamic applications.
• Complex SPAs can be inconvenient and laggy.

What is the difference between Angular and AngularJS?

• Architecture: AngularJS uses MVC, Angular uses components and directives.
• Performance: Angular offers better performance with improved features.
• Language: AngularJS uses JavaScript; Angular uses TypeScript.
• Mobile Support: Angular has better support for mobile platforms.

Main Angular Technical Questions

Expect to discuss more technical aspects and possibly do some coding.

What are the building blocks of Angular?

• Components control views and are the fundamental building block.
• Data Binding coordinates parts of templates with parts of components.
• Dependency Injection provides required dependencies to new components.
• Directives instruct Angular on how to process a template.

What is Data Binding?

Data binding is the synchronization between the model and the view.

• Event Binding allows the app to respond to user input.
• Property Binding integrates values from app data into HTML.
• Two-way Binding reflects changes in the application state directly into the view and vice-versa.

Define the ng-content Directive

The ng-content Directive is used in Angular to facilitate content projection/reuse of components.

What is a “service” in Angular?

In Angular, a service is a singleton object that organizes and shares business logic, data, and functions across various parts of an application.

Always be prepared

Be honest during your interviews, especially when discussing topics you are less familiar with. Good luck!