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Angular 4 Interview Questions for Interview Preparation

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Angular 4 interview questions are an integral part of front-end tech interviews since Angular is a hugely popular web and application development framework. Angular 4 is open source and based on JavaScript. It uses HTML, CSS, and TypeScript to build compelling user interfaces used worldwide. To ace your Angular 4 interview, you must practice the most frequently-asked Angular 4 interview questions in FAANG interviews.

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Angular 4 interview questions are an integral part of front-end technical and coding interviews. In this article, we will go through the top interview questions Angular 4 for freshers and experienced front-end developers.

We will cover these topics:

  • What Do Angular 4 Developers Do?
  • Topics to Prepare for Your Angular 4 Interview
  • Top Angular 4 Interview Questions
  • Angular 4 Interview Questions for Experienced Professionals
  • Angular 4 Interview Questions for Candidates with 10 Years of Experience
  • Angular 4 Interview Questions for Developers
  • More Sample Interview Questions for Angular 4 Developers
  • FAQs on Angular 4 Interview
  • How to Prepare for Angular 4 Interviews?

What Do Angular 4 Developers Do?

Angular 4 developers are responsible for delivering complete front-end application solutions. They ensure that the application solutions they deliver are high on performance, efficiency, and responsiveness on desktop and mobile. They are also responsible for writing, testing, and documenting code in HTML, CSS, and JavaScript. 

They liaison between graphic designers, HTML coders, and front-end developers. They also need to coordinate their workflow with the team of back-end developers when working on RESTful API integration. Their role also includes communicating with external web services from time to time.

With every business going online the world over, the demand for skilled front-end Angular developers has risen rapidly over the last few years.

Topics to Prepare for Your Angular 4 Interview

The questions asked in Angular 4 interview questions are typically based on the following topics:

  • Core JavaScript
  • Angular framework
  • TypeScript
  • HTML and CSS
  • RESTful API integration
  • Node
  • Webpack

Top Angular 4 Interview Questions and Answers

Most Angular 4 questions asked in FAANG interviews are based on the Angular framework and the concepts mentioned above. To help you prepare for your Angular interview, we have compiled the most frequently asked interview questions on Angular 4 below:

We have put together some Angular 4 interview questions and answers that are commonly asked in tech interviews. Make sure you practice questions like these to increase your chances of nailing your front-end developer interview.

Q1. What are the different types of binding options in Angular 4?

A. Data binding is a crucial Angular component. The binding process in Angular 4 establishes synchronization between different layers of an application, such as Model and View. The data binding feature has been available since Angular 2. There are several different kinds of binding available such as:

  • Event binding: It involves the values of a variable from the View layer to the Model layer.
  • Property binding: It involves the values of a variable from the Model layer to the View layer.
  • Two-way binding: It is a combination of event binding and property binding.

Q2. Differentiate between Directives and Components in Angular 4.

A. An Angular Directive is used to define a Class and used at run time for instantiating and processing. An Angular component is defined using a Decorator and is a basic class that interacts with components of web pages such as HTML and UI elements. Every component possesses a predefined template.
Q3. How is Typescript useful in Angular 4?

A. Typescript is a general-purpose programming language by Microsoft, and it serves as a superset of JavaScript. The entire Angular 4 framework is built on Typescript, so it is the primary language for Angular developers. To develop Angular apps, Typescript is used to write code that is later transpiled for multiple browser versions or platforms using a transpiler.
Q4. Explain the concept of Components in Angular 4.

A. An Angular Component is a basic class that interacts with components of web pages such as HTML and UI elements and is defined using decorators. Every component comes with a predesigned template and allows for the definition of selector, style, and template inside the component to add more functionality.

Q5. What do you understand about Modules in Angular 4?

A. An Angular Module is a file where Components, Directives, Pipes, and Services are grouped to make a fully functional application. Angular applications have root modules that are defined within the Typescript file format app.module.ts. A NgModule is used to define a module in Angular 4.

Recommended Reading: Google Frontend Engineer Interview Prep

Angular 4 Interview Questions for Experienced Professionals

Here are some Angular 4 interview questions and answers for experienced front-end engineers and developers:

  1. Explain the concept of Routing in Angular 4.
  2. What do you understand about Directives in Angular 4?
  3. Explain Dependency Injection (DI) in the context of Angular 4.
  4. How will you conduct isolated unit tests in Angular 4?
  5. Explain the concept of Services in Angular 4.
  6. What is the purpose of deep linking in Angular 4? 
  7. What are the essential differences between Angular 4 and Angular 5? 
  8. Explain the concept of eager loading in Angular 4.

Recommended Reading: Angular 2 Interview Questions

Angular 4 Interview Questions for Candidates with 10 Years of Experience

Here are some advanced Angular 4 interview questions for experienced candidates:

  1. What is the use of primeng in Angular 4?
  2. How will you debug Angular 4 projects from Visual Studio 2017? 
  3. What is the need for Ngmodel in Angular 4?
  4. How will you create a new component using CLI in Angular 4? 
  5. What are the different types of component decorators used in Angular 4?
  6. Explain the purpose of CanActivate in Angular 4?

Recommended Reading: Angular 6 Interview Questions

Angular 4 Interview Questions for Developers

Take a look at these Angular 4 interview questions for developers:

  1. What is the essential difference between Angular and AngularJS?
  2. How will you add an external JS file to Angular 4? 
  3. Explain the concept of the JWT interceptor.
  4. Explain JIT and AOT in Angular 4.
  5. Explain the concept of Transpiling in Angular 4.
  6. What is the best way to handle Events in Angular 4? 
  7. Explain the concept of filters in Angular 4.
  8. Differentiate between AngularJS 4 and AngularJS.
  9. How will you set up an HTTP Request Header in Angular 4? 

Recommended Reading: Angular 7 Interview Questions

More Sample Interview Questions for Angular 4 Developers

  1. Explain the types of data binding.
  2. Describe the features of Angular4.
  3. Explain the concept of unit testing in Angular 4.
  4. Explain the concept of ElementRef in Angular 4.
  5. How are Services used in Angular 4?
  6. Differentiate between interpolation and property binding. 
  7. Differentiate between pure and impure pipes.
  8. How will you send and set cookies in Angular 4?
  9. How will you handle HTTP error responses in Angular 4? 
  10. What is the use of a subscribe method in Angular 4?
  11. How or why is Angular 4 faster? 
  12. What are the types of Angular Directives in Angular 4?
  13. Explain the concept of dependency injection in Angular 4.
  14. How will you create a custom pipe in Angular 4?
  15. Explain the concept of @NgModule Metadata Properties.
  16. Differentiate between DOM and BOM.
  17. Explain the concept of lazy loading.

Recommended Reading: Angular Interview Questions You Must Prepare for in 2022

FAQs on Angular 4 Interview Questions

Q1. What is the salary of an Angular developer?
The average starting salary of an Angular developer is approximately $114,989 per year. Senior developers can make up to $140,724 per year. 

(Source: talent.com).

Q2. Are Angular 4 developer jobs in demand?
A. Angular 4 developer jobs continue to be in demand because the Angular framework is used for developing modular capabilities, scalable libraries, and advanced interactive features in web applications of enterprises the world over. Because of the Dependency Injection feature, the Angular platform uses HTML extensively, making the assembly of the application very easy. With additional features like versatility and independence thanks to the sophisticated MVC architecture, Angular 4 is one of the most in-demand UI frameworks in the market today.

Q3. Which companies use Angular?
A. Some of the major companies that use Angular for web development are Microsoft Office, Gmail, PayPal, Forbes, Deutsche Bank, Samsung, UpWork, Grasshopper, Delta, Santander, Mixer, Overleaf, and more.

Q4. What are the top skills an Angular developer should have?
A. The top skills an Angular developer should have are Core JavaScript, Angular framework, TypeScript, HTML and CSS, RESTful API integration, adjacent technologies such as Node and Webpack, eye for detail to write high-quality code, good communication skills, and teamwork skills.

Q5. What are the top Angular 4 interview questions?

Some of the most commonly asked Angular 4 questions are: 

  • Explain the types of data binding. 
  • Describe the features of Angular4. 
  • Explain the concept of unit testing in Angular 4. 
  • Explain the concept of ElementRef in Angular 4. 
  • How are Services used in Angular 4? 
  • What is the essential difference between Angular and AngularJS? Differentiate between DOM and BOM. 
  • Explain the concept of lazy loading.

Ready to Nail Your Next Angular 4 Interview?

With the demand for Angular jobs rising, the competition is stiff. The key to acing the interview is to be adequately prepared for the interview. Register for IK’s webinar today to learn how you can leverage best-in-class interview preparation courses and mock interviews with experts.

With exclusive access to the Interview Kickstart Curriculum, you will cover every aspect of an Angular 4 interview, from coding problems to front-end systems design and specific domain knowledge about the Angular 4 framework, along with in-depth preparation for behavioral and leadership interview rounds.

Interview Kickstart has helped over 9,000 engineers land coveted offers from FAANG and tier-1 companies. Our instructors are technical leads and hiring managers at FAANG and know exactly what it takes to crack Angular developer interviews.

The only thing that lies between you and your dream FAANG job is your interview prep. Sign up for our FREE webinar to take your prep to the next level!


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