Top Angular 2 Interview Questions and Answers - Essential Guide for Job Seekers

Last updated on Feb 07, 2024
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Angular 2 Interview Questions

To survive in the modern industry and to earn a very good salary, learning only JavaScript programming language is not sufficient, you must move on to learning JavaScript Frameworks also i.e., Angular. It doesn’t matter if you are thinking to start your career in software development or are already a software developer, you will always find Angular 2 Interview Questions useful. This is an open-source component-based UI framework that is written in TypeScript and is mainly used in building web, mobile, and desktop applications in HTML and JavaScript. Angular is an evolved and upgraded version of Angular JS and is invented by Google. For writing codes, Angular provides many language choices like Typescript, Dart, ES5, ES6. It supports both data and property blinding which allows a user to control DOM i.e., Data Object Model by binding class and HTML properties.

Quick Facts About Angular 2
What is the latest version of Angular? Angular 14 released on 2nd June 2022
When did angular 6 release? 14th September 2016
Who is the developer of Angular 2? Google
What language does Angular use? TypeScript
License MIT License
Official website

Frequently Asked Angular 2 Interview Questions for Developers

Here in this article, we will be listing frequently asked Angular 2 Interview Questions and Answers with the belief that they will be helpful for you to gain higher marks. Also, to let you know that this article has been written under the guidance of industry professionals and covered all the current competencies.

Q61. What is services and also explain its features in angular 2?

Services allow greater separation of concerns in Angular applications. They also provide modularity by allowing developers to extract common functionalities out of components. Adding Services to Angular applications makes components free from data access code.


Service has the following features:

  • Singleton, i.e. only one instance of service will exist throughout the application.
  • Capable of returning data in the form of Observables and promises.
  • Decorated with @Injectable() decorator
Q62. What is the basic building block of Angular 2?
Here is the list of main building blocks of Angular 2:
  • Modules
  • Dependency injection
  • Data binding
  • Components
  • Templates
  • Directives
  • Metadata
  • Services
Q63. What is resolver in angular 2?

In actual, resolver (class) is a powerful technique which is used to achieve the best user experience when browsing between pages in the application. For the implementation of the resolver class, it is important to create a new folder called resolves. Thereafter put resolvers with same template resolveName.resolver.ts

Q64. What is Activatedroutesnapshot in angular 2?

Activatedroutesnapshot in Angular 2 is basically an immutable object which is used to represent a particular version of ActiveRoute.

For the implementation of Activatedroutesnapshot object following syntax can be used.

export class ActivatedRoute {
   /** The current snapshot of this route **/
   snapshot: ActivatedRouteSnapshot;

Q65. What is Router state in angular 2?

Router state represents all the state of the router as a tree of activated routes.

interface RouterState extends Tree {
   snapshot: RouterStateSnapshot
   toString(): string

Q66. What is the significance of the catalyzer in Angular 2?

Codelyzer refers to an open-source tool that is used to run or detect if the predefined coding guidelines are followed or not. It only performs the static code analysis in angular 2 and typescript project because all platforms follow a set of easy and conventional coding to maintain it in a better way. Codelyzer also runs on the top of tslint where its coding convention is completely defined in the tslint.json file. The developer can also run it through an angular click.

Q67. If the path does not exist how will you redirect it or how you will deal with 404 in Angular 2?

Using the angular routing command it gets easier to navigate through the view page or any other file during any tasks. One can also configure the URL to redirect any other URL and this feature can also be handled to address the problem of "404 not found". By using the location services one can go back and forward along with the page history. Its syntax is- e can use {path: '/OUR_PATH', redirectTo: ['redirectPathName']}

This is one of the most common Angular 2 interview questions.

Q68. How will you deal with angular 2 application errors?

The applications in angular 2 have an error handling option which also includes the react JS library to use the catch function. In turn, the catch function includes a link that sends information about the error handler function. under this function one can send the error as a question to console file other instances will send it back in the main program to ensure the continuation of the operation of the main program. Once it is fixed whenever the error arises it will be redirected in the browser's console.

Q69. What is gulp in Angular?

Gulp is a mission runner that approves you to define a sequence of repeatable tasks that can be run any time you need. You can automate boring matters like the minification and uglification of your javascript or some thing else you do in order to make your code production-ready.

Q70. What is HammerJS in Angular 2?

It is a famous library that helps you add aid for contact gestures (e.g. rotate, swipe, pan, zoom ) to your page. We will enhance a swipe-able card. Angular 2 presents a token known as HAMMER_GESTURE_CONFIG which accepts a HammerGestureConfig type.

How to install HammerJS

npm install hammerjs --save

Tips to Crack Angular 2 Interview Questions
  • Angular Interviews are not just about learning Java Concepts but one of the toughest questions is to know about software and system designs.
  • Practice is the key factor to crack any type of interview. Angular interviews are no exception too.
  • You should know about basics such as TypeScript, Services, Metadata, Components, etc.
  • If you know about the answer but you are taking too much time to explain it, then that land you nowhere. So yes, Time Yourself i.e. answer your question within a time limit.
  • Teach a concept to your friend or anyone which you have learned. By this, you will know if you learn that concept.
  • Honesty is the best policy. If you don’t know the answer just admit it without wasting the interviewer and your time.
Reviewed and verified by Umesh Singh
Umesh Singh

My name is Umesh Singh having 11+ experience in Node.JS, React JS, Angular JS, Next JS, PHP, Laravel, WordPress, MySQL, Oracle, JavaScript, HTML and CSS etc. I have worked on around 30+ projects. I lo...