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.

Q41. What are lifecycle hooks and why it is important?

In Angular, lifecycle hooks are functions which will be called at specific points of a component lifecycle in Angular applications.

They are highly crucial for a component architecture based application.

Q42. What is Angular 2 and also explain its components?

Angular 2 is the upgraded and evolved version of AngularJS, a JavaScript framework that was invented by Google. Angular 2 is used for building single-page web or mobile applications.

Components are essential elements of Angular 2 apps, and an application can have a number of components. In Angular 2, components perform all the tasks that were done by scopes, controllers and directives, such as creating or adding Data, logic, and custom elements.

In Angular 2 a component consists of the following:
  • Template
  • Class
  • Metadata
Q43. What happens when the page containing Angular based application loads?

When a page containing Angular based application loads, these below-mentioned scenarios will be completed.

  • The browser will load the HTML document and evaluate it.
  • The file for AngularJS JavaScript will be loaded and the Angular global object will be created.
  • Finally, the JavaScript that registers controller function will be executed.
Q44. What is deep linking in Angular 2?

In Angular 2, deep linking is a process of the URL that will take to users to a specific page or content directly without crossing the application from the homepage. The deep linking process helps with website or application indexing so that search engines can easily crawl these links.

Q45. What is the factory method in Angular 2?

As services are reusable singleton objects in AngularJS which is used to organize and share codes across the application, they can be injected into filters, controllers, and directives. Angular 2 offers three ways to create a service; factory, service, and provider.

The factory function allows developers to include some logic before creating the object and returns the created object. The syntax for factory function is as follows.

app.factory('serviceName',function(){ return serviceObj;})

Q46. What is routing in angular 2?

Routing is what lets in you to create Single Page Applications. AngularJS routes allow you to create distinct URLs for one of a kind content material in your application. It helps in redirecting users to exceptional pages based totally on the alternative they pick out on the main page. AngularJS routes enable one to show more than one content depending on which route is chosen. A route is unique in the URL after the # sign.

Q47. How to redirect to 404 or other path if the path does not exist in Angular 2?

Using angular routing you can navigate from one view or page to another while performing your tasks. You can configure a URL to redirect to the next URL. This feature can be handled to address the "404 Not Found" problem. Using location services in Angular routing you can go back and forward through the history of pages.

Syntax : We can use {path: '/OUR_PATH', redirectTo: ['redirectPathName']}


{path: '/404', name: 'PageNotFound', component: NotFoundComponent}

Q48. What is the use of codelyzer in angular 2?

It is an open source tool for running and checking if the pre-defined coding guidelines were followed or not. It does static code analysis for typescript and angular projects.

It runs on top of tslint and coding conventions are defined in tslint.json file. Editors such as Visual Studio Code support codelyzer by doing basic settings.

Q49. What is the difference between a service() and a factory()?
factory() service()
The factory function allows developers to add certain logic before the creation of an object. This one is a constructor function which helps creating the object with a new keyword. Developers can add functions and properties to a service object by using the keyword.
It will return the created object. It returns nothing.
app.factory('serviceName',function(){ return serviceObj;}
Q50. What is the difference between Angular 2 and AngularJS?
  AngularJS Angular 2
1. No mobile support Mobile-oriented
2. Only supports Dart, ES6 and ES5 Offer more language choices
3. Easy to set up Dependent on libraries. Requires efforts to set up.
4. Based on controllers and scope Component-based.
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...