Angular 2 Interview Questions and Answers for Beginners and Experienced Developers


We have come up with the detailed Angular 2 interview questions and answers. To help developers of all experiences, we have divided the questions with respect to the skills and experience level.

The two things that you need to know about Angular 2 right off the bat include; it’s a highly effective platform for the development of mobile applications, and secondly that there is no such thing as being completely prepared for a job interview. Now that we have given you the gem of wisdom, let’s discuss it in a bit of detail.

We are living in the digital world where businesses of all sizes and shapes are looking to find their way onto the digital platforms. And with an ever-increasing number of businesses looking to join the online bandwagon, there is a high demand for a skilled mobile application developer who can give businesses the right solution to serve business needs.

However, the talent comes at a cost, right? The high demand for skilled developers has led to significantly better compensation being offered by the businesses for their services. If we are to take the numbers given by Glassdoor, the average annual compensation of Front End Developers (a skill of Angular programming) may range from USD 77K to over 100k.

Well, that’s good news if you are considering pursuing the development phase or are an experienced developer since there are plenty of opportunities for you to explore. However, to be able to grab the best opportunity and make the most of your skills, you need to be prepared to make the best impression in the interviews with your knowledge and skills.d with this in mind,

So, let’s get started…

HirinGuru Skill Assessment for Angular 2 Developers

HiringGuru is one of the leading technical recruitment platform offering employers and HR professionals with interactive and automated tools and features they need to screen the top talent for remote recruitment. The platform brings in extensive resources for recruiters to streamline their hiring process like a repository of angular 2 interview questions and answers, which doesn’t just help recruiters but also enable potential candidates to get better prepared for the hiring process. Here’re some reasons why HiringGuru is trusted by the leading businesses to manage their recruitment needs;

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When it’s about choosing the right talent for programming or development resumes don’t really speak the true skills and expertise of a candidate. Thereby, it’s important for recruiters to look beyond the resumes and assess the true coding skills of the candidates using expertly developed screening criteria. That’s precisely how HiringGuru tends to assist companies with; giving them the right tools and techniques they need to assess the true potential of candidates.

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Large tech companies are able to maintain the qualitative edge over competitors given the well-defined recruitment strategy that enables them to consistently acquire the top talent for the positions. With HiringGuru, businesses of all sizes now have access to the professional standard screening tests, assisting them to execute and maintain the highest technical standard for the hiring procedure.

HirinGuru – Assisting businesses to find the best fit!

What makes HiringGuru a premium technical recruitment platform is that it brings in several hiring tools and features as a means to make the hiring process easier and efficient for businesses. For instance, the platform doesn’t just offer a well-maintained repository of Angular 2+ interview questions, but also have real-world coding problems and projects to assess the true talent of the candidates. Some of the assessment methods offered by HiringGuru includes;

Aptitude Tests

Get access to the most exhaustive repository of technical MCQs, professionally developed, and periodically updated to assess the true talent of candidates.

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If you are looking to assess candidates for an Angular 2 development position, HiringGuru doesn’t just bring in endless Angular 2 interview questions and answers but also brings in astute coding tests that give the best assessment of the technical prowess of the candidates.

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Domain tests are meant to enable recruiters to assess the skills and knowledge of candidates about their field of expertise and their capacity to perform different tasks.

Angular 2 Interview Questions and Answers Topic for Beginners

Ok, before we began looking at some of the top Angular 2 interview questions, let’s first see the list of important topics you need to go through in greater detail for better interview performance.

  • Filters
  • Modules
  • Templates
  • Services
  • Expression
  • Routine
  • Data Binding
  • MVC
  • Scope
  • Directives
  • Expressions
  • Templates

15 Best Angular 2 Interview Questions and Answers for Beginners

Ok, now that we have gone through the basics of Angular 2 and what makes it such an effective development framework for mobile and web applications, let’s start our Angular 2+ interview questions. First, we will be looking at Angular 2 interview questions and answers for beginners, before moving on to the questions and answers for experienced professionals.

1. What is Angular 2?

While this may seem a simple question, there’s a good chance that the interviewer may gauge you for your basic knowledge about the framework. In this regard, it’s better to keep your answer brief and to the point, reflecting your understanding of the framework.

For instance, you may answer, “Angular 2 is the latest version of Angular framework, which technically is a Google maintained JavaScript framework. It’s an open-source front-end development framework used for the development of mobile and web applications.

2. How are you familiar with the framework?

Again, the purpose here is to assess your familiarity and knowledge of the platform by asking you about your previous experience with the framework.

The answer to this question may be like, “I am quite familiar with the framework, as I have worked in the framework previously for different projects completed with the previous employer. The framework played an important role to streamline the online business processes, as well as, to enable the development of high-quality and attractive web platforms for clients.

3. What is Angular 2 used for?

Angular 2 is widely used for the development of large-high-quality web and mobile applications. The framework provides developers with easy to implement design modules, which makes it more efficient to develop an interactive platform with simplified architecture. The features and tools offered by Angular 2 make the entire process of developing mobile and web applications much simplified and interactive.

4. Tell me the difference between Angular and Angular JS?

The key difference between Angular 2 and Angular JS is in the command, and architecture of each framework. For instance, AngularJS depends on the JavaScript language along with the MVC design model for its operations, whereas, Angular 2 uses Typescript language and components and directives to run.

5. What’s the scope in Angular 2?

The Scope represents an Object in Angular 2, which defines the complete application model. Apart from this, Scope also represents the execution context of the expressions, which is generally called within a hierarchy; resembling the Document Object Model (DOM), application structure.

6. What is data binding in Angular 2?

Data binding enables communication betting the components being developed with the DOM, which makes it one of the more significant features of the Angular 2 framework. The data binding feature in Angular 2 comprises of four main forms, including;

  • Two-way
  • Property
  • Event
  • String interpolation

7. What are the directives in Angular 2?

The directives represent the connection of specific behavior in Angular 2 with the various elements within the DOM. 

8. What is NgModule?

The NgModule in Angular 2 defines the connections between the different parts of an application. All Angular 2 applications come with at least one NgModule which would be bootstrap by the developer to launch or run the application.

9. What is the use of Filters in Angular?

Filters in Angular 2 may be added for controllers, application services, templates, and applications as a means to format expression values and organize data under specified criteria, making it easier for users to navigate through the web pages.

Q10. What’s the process to optimize the Angular 2 application?

The process of optimization for Angular 2 will comprise of the following steps;

  • Determining the uses of the framework
  • Depending on the scope of work, removing the third-party libraries, along with the dependencies
  • For large applications, we may choose an alternative fully-bundled app
  • AOT compilations may also be added to streamline the process for Angular 2

Q11. What’s a pipe?

Pipe in Angular 2 is used to transform and format the data.

Q12. What is the directive?

Directives in Angular 2 are used to design reusable elements and add behavior into the existing DOM elements.

Q13. Define AOT compilation

AOT or Ahead of Time is a feature that enables the compilation of components and temples at build time, instead of in the browser at runtime. The components and templates are transformed into native JavaScript and HTML.

Another benefit of AOT is that it enables faster download and rendering times, whereas, also help developers to identify build-time errors easily.

Q14. How would you handle error in the Angular 2 application?

Angular 2 comes with a built-in error handling option. All we need to do is to include the ReachJS catch library, after which we can use the catch function, which sends developers the Error Handler function.

Q15. What’s the role of decorator in Angular 2?

Decorators in Angular 2 are used to identify an object or class type. The decorators also bring additional metadata, which governs the processing of components.

25 Best Angular 2 Interview Questions and Answers for Experienced Developers

Well, now that we are over the easier angular 2 interview questions meant for the beginners, let’s now move on to some more technical angular 2 interview questions and answers which may be asked for experienced positions.

Q1. Differentiate between service () and factory ()

Service () in Angular 2 represents the function and is used as the application’s business layer. The factory () function is also quite similar to the service (), however, it brings in more flexibility for the developers as compared to the latter.

Q2. What’s $Scope and scope in Angular 2

The $Scope function in Angular 2 is meant to execute the dependency injection (DI). The $Scope can be injected into the directives, service, or controllers. Alternatively, Scope in Angular 2 is a directive link and can represent anything including a function parameter, name, or others.

Q3. What’s the scope hierarchy?

In Angular 2 the $Scope objects are structured into a definite hierarchy, which consists of a root scope and may also comprise other “child scopes”. Simply, a root scope may include multiple child scopes, which are structured in scope hierarchy.

Q4. Define AOT compilation

AOT or Ahead of Time is a feature that enables the compilation of components and temples at build time, instead of in the browser at runtime. The components and templates are transformed into native JavaScript and HTML.

Another benefit of AOT is that it enables faster download and rendering times, whereas, also help developers to identify build-time errors easily.

Q5. Explain jQLite.

The JQuery lite comes as default in the Angular 2 package and is used to manipulate the DOM. The primary function of JQlite is to enable better compatibility of applications with different browsers.

Q6. Explain Angular Modules.

NgModules represents the modularity system, which is followed by all the web and mobile applications developed in Angular 2. The modularity system comprises of a cohesive block of codes, exclusively meant for the capability sets like domain, workflow, or others.

Q7. What components are used to develop a custom directive?

A custom directive may be developed using any of the below-mentioned components including;

  • Comment
  • Element directives
  • Attribute
  • CSS

Q8. List Angular 2 filters

Some of the AngularJS filters include;

  • JSON 
  • number
  • Date
  • filter 
  • Currency
  • orderBy 
  • uppercase 
  • lowercase 
  • limit

Q9. Define Dependency Injection.

The dependency injections are software design pattern, where the objects are carried as dependencies within the components.

Q10. What does dirty checking represent in Angular 2?

The dirty checking is used to scan and compare the complete values of the new model with the old models for necessary changes.

Q11. Explain transpiling.

The Trasnpiling refers to the process of changing the programming language of source code

Q12. How to animate in Angular 2?

For animation, the developer would have to use Animate Library in Angular 2.

Q13. Explain transclusion.

The transclusion is meant to change the position of original children of directives to specific locations in a new template.

Q14. What are the events in Angular 2?

Events are used to customize the behavior of DOM events.

Q15. State some testing tools for Angular 2 applications?

Some testing tools for Angular 2 applications include;

  • Bowserify
  • Karma
  • Sion
  • Mocha
  • Angular Mocks

Q16. How can we create a service in Angular 2?

Service can be created in Angular 2 by any of the below-mentioned ways:

  • Factory
  • Service
  • Provider

Q17. What is a singleton pattern?

The Singleton pattern is used to restrict the use of a class. It is mostly used for services or dependency injections.

Q18. Define REST in Angular 2?

REST stands for Representational State Transfer and is an API used to pinpoint data through the requested URL

Q19. Define bootstrapping.

Bootstrapping refers to the initialization of an angular 2 app

Q20. State difference between compile and link

Link is used in Angular 2 for DOM registration and manipulation, whereas, the compile function is used for manipulation in template DOM, and to collect directives.

Q21. Define Constants in Angular 2.

Constants define the global data in angular 2

Q22. What is Angular Global APIs?

Angular Global APIs are used to perform various tasks including objects iterations, data conversion, and others.

Q23. Are Nested Controllers allowed in Angular 2?


Q24. Is Angular 2 compatible with all browsers?

Yes. The Angular 2 framework is completely compatible with all major browsers including Chrome, Opera, Firefox, Safari, etc.

Q25. When would you use factory and service if they are equivalent?

Factor function is preferred with an object, whereas, the service function is preferred with class.

What is Angular 2?

Angular 2 is a popular development framework widely used to create large high-performance mobile and web applications with interactive interface and easy maintenance. Some of the worth mentioning features of the Angular 2 platform includes;


The previous version of the framework was more focused on Controller, however, Angular 2 is more intended towards Components over controllers. The primary purpose of components is to assist in the development of application into various modules. This approach enables the development of applications with easy maintenance over the lifecycle of the application.


The Angular 2 is a Superset of JavaScript-based on TypeScript and maintained by Microsoft.


Services in Angular 2 refers to the set of codes that can be shared amongst the various components of an application.

Benefits of Angular 2

There are various benefits of Angular 2 over other development frameworks, as well as, from the previous versions of Angular. Some of the benefits include;

  • Faster Rendering
  • Better performance
  • Simple code
  • Component-based simplified architecture
  • Easy to read and run
  • Mobile optimization

Angular 2 + Interview Questions – Be prepared for your dream job!

Well, by now you must be better prepared to face the music for Angular 2 interview questions and answers. As we said before, there is nothing as being perfectly prepared for the angular 2 interviews, however, by going through these questions on top of your previous skills and knowledge you will certainly have a better chance to impress the interviewers and secure a better position.

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