Top Angular Interview Questions and Answers for 2022

Angular has been making an audacious change among businesses with the variety of applications it is capable of developing. If we were to guess who is behind developing robust web applications and helps in business productivity enhancements then the answer is the Angular developers. They make this framework take the shape of an actual application with fully functional features and functionalities. Hence, if you see an Angular development company, they are very specific on whom to hire for their app development process. For the freshly brewed novice candidates as well as the experienced ones, there is an equal need for both these types of developers if they know how to deliver results. For better understanding and screening, we have designed a set of questionnaires of the most often requested Angular interview questions and answers to familiarize  you with the types of Angular interview questions.

These basic angular interview questions can be asked by interviewers to the potential candidates in their job interviews and also these questions will help many developers who are selected for onsite project development. With our understanding and best practices for Angular development, we have covered all regularly requested basic and advanced Angular interview questions and answers in this collection of Angular interview questions to assist developers to effortlessly pass their job interview.

1. What is Angular? Why was Angular introduced  into the Market as a Client-Side Framework?

If we go by the stats then, there are around 1.2 million Angular developers working on different technologies at the moment. With over 12K contributors, Angular is also one of the most popular open source frameworks. Also, the majority of developers would know this for a fact that Angular is an open-source typescript framework used to develop Single Page application/s. Angular uses HTML and typescripts libraries to develop these applications. Angular components are built around reusable, shareable components, such as RESTful APIs for connecting to old systems, databases, and apps.

To answer the second part of the question, why angular was introduced as a client-side framework. Prior to the advent of JavaScript-based client-side frameworks, dynamic websites were created using templates. Templates were nothing more than HTML code with blank areas to display data and content to be fed into. Typically, this information was obtained from a database. We would then provide the created HTML content to the user after integrating the template and data. As you can see, it was a bit difficult, and it required a lot of processing in certain circumstances.

To address these challenges, individuals devised a new method in which they deliver the data needed to generate a page from their web servers to web browsers and then let JavaScript mix this data with a specified template. Angular universal is used in server-side rendering Some advantages of using Angular universal are improved SEO, faster loading, and improved user experience. And then the data was sent to the client via the internet in a programmable format like XML or JSON. Ever since the introduction of Angular, the performance of apps has improved. Some of the reasons for using angular over traditional web technology are, it facilitates client and server communication, supports Two-way data binding, provides different Angular templates, and facilitates the building of a single-page application

2. Which is the Latest Version of Angular and What are the Key Differentiating Factors?

Which is the latest version of Angular and what are the key differentiating factors?

The latest and stable version of Angular is 12 which was recently released in September 2021. After Angular 10, there were many enhancements that have made the development process faster, effective and robust. This has also made Angular the most worthy choice among the developer community. What sets angular framework apart from others of the same Javascript frameworks is features like declarative templates, end-to-end tooling, dependency injection, expression syntax and other features make the angular development process simpler.

3. What are the Components in Angular?

In any framework, whether Vue, or Angular, the components are the fundamental building blocks that make the interface different. It is the same with the Angular user interface as well. A component is made up of HTML, CSS, and JavaScript for a specific area of a user interface. For every Angular application, there is at least one component, this root component is the one that helps you connect with other components in a hierarchy with the page document object model (DOM).  Consider this to be a special HTML element that can only understand the Angular framework. These components are separated, which means that styles and code from one component do not influence other components because they are namespaced by the compiler. The Angular framework then assembles multiple values from these components to create the user interface that will be rendered by the browser. 

In this framework, the components are organized into NG modules and this module collects necessary information and converts it into functional sets into a defined set of Ng modules. There is a root module that initiates bootstrapping. These components also have classes which are known as decorators and then there are metadatas, application components and others.

4. What are Some of the Advantages of Angularjs over other Frameworks?

What are some of the advantages of Angularjs over other frameworks?

The Angular framework has a noteworthy contribution in the developers community. Some of the most popular advantages of Angular are listed here:

  • MVC architecture – We know that Angular is an MVC framework and it expresses a clear belief about how the application should be constructed. This architecture also supports bi-directional data flow and refreshes the actual DOM.
  • Ng Modules: As we discussed, modules are another essential part of Angular. It  is made up of many design patterns like components, directives, pipelines, and services that aid in the construction of applications.
  • Dependency injection: This functionality enables developers to quickly work with components that are dependent on other components.
  • Other general benefits include clean and manageable code, unit testing, reusable components, data binding, and a responsive experience that is second to none.

5. What is AOT compilation? What are the advantages of AOT?

If you want to crack this one, you must know AOT. An angular application is made up of components and templates that a browser cannot comprehend. As a result, before you start the implementation process in the browser, every Angular app must be built. The Angular compiler accepts JavaScript code, compiles it, and then delivers an output in JS code. It is known as AOT compilation, and it occurs just once per user per event. This sets true for all angular applications

For AOT, angular supports two types of compilation:

  • JIT (Just-in-Time) compilation: Here the program is built within the browser while it is running.
  • AOT (Ahead-of-Time)- Here the compilation occurs before the application is built.

The advantages of being ahead of time in the compilation process are

Less errors: The errors are easily detected and handled throughout the construction phase.

Enhanced Security: Before an application runs in the browser, the AOT compiler inserts HTML and templates into the JS files, eliminating the need to read additional HTML files and thereby improving application security.

Faster results- As the program is built before running within the browser, the browser loads the executable code and renders it promptly.

Minimal Ajax Requests: Just because the compiler provides the external HTML and CSS files together with the application. Thus, you can send separate AJAX requests for those source files and reduce the AJAX request count to only the necessary ones.

6. Explain What is String Interpolation and Property Binding in Angular?

If we go by the term interpolation then interpolation means interconnecting and binding strings with data. This is also called one-way data binding. In this process, there is a special syntax used under double curly braces to display the component data. Within the brackets, you can include the JavaScript expressions. The Angular expression  needs can also be executed to retrieve the desired outcomes and insert HTML code into it. As a part of this cycle, the code needs a regular update and storing process. 

Say for instance if you want to store data, then you can store data as

{{data}}

7. Explain the Concept of Dependency Injection?

If you want to get selected for your dream job, the key to it is to know every little concept of Angular framework. Dependency injection is one of the key aspects in Angular. Also sometimes known as DI, is a software design paradigm that addresses how code obtains its dependencies. The operation “config” uses dependency injection to get aspects of the application that must be configured when the module is loaded.

In the dependency injection there are majorly three ways of handling dependencies.

  • The first way is to initiate the use of a new operator 
  • Another  way is to determine it by keeping a global reference value.
  • The last way is to move the data to the place where it is needed the most.

8. Explain What is MVVM Architecture?

The MVVM design is important in removing tight coupling between components. This architecture is made up of three parts:

A model is a representation of the business logic and data of a certain application. To put it another way, it is made up of entity structures. The model contains the business logic, as well as model classes, remote and local data sources, and the repository.

The view is the visible layer of the program that contains the UI code. The action of the user is delivered to the ViewModel through the view. It does not, however, receive a direct answer. To receive a response, the view must subscribe to the ViewModel’s observables.

ViewModel: The View Model is the application’s abstract layer that links and functions as a bridge between the View and the Model. It has no idea which View should be used because it does not have direct access to the View. The two are linked through data binding, and the ViewModel records any changes made to the View and makes the required modifications to the Model.

9. List Out Differences Between AngularJS and Angular

Angular technology has a spinoff effect on business development strategy. But there is always this confusion between AngularJS and Angular framework which needs to be differentiated. Let’s simplify this with a differentiating table. 

Differentiating ParameterAngular JSAngular
ArchitectureIt is backed up by an MVC modelThis one is backed up with components and directives
Supporting LanguageJavaScriptTypescript
Mobile App supportDoes not cover all the platformsIt encompasses the usage of almost all software platforms.
General ManagementFor bigger projects with complex and big source code.It is better and easy to manage and code larger projects.
Dependency InjectionNot ApplicableSupports at  many levels

10. Explain What is the Difference between Angular and Backbonejs?

Also, the final question in this list of angular interview questions can be related to backbone js. Now if you don’t know what backbone js is then here’s the quick brief about it. Backbone js is a javascript library with a JSON interface and is completely dependent on Javascript library functions. Most of the time, it is used because it is light weighted and supports dependency injections. But then why is it important to know the comparison between Angular and Backbone Js. Let’s get clearer with the difference table.

Differentiating TableBackbone JSAngular
TypeBackbone.js is completely dependent on Javascript libraries with RESTful JSON interface and MVP framework.Everyone knows angular is an open-source JS-based front-end app development framework that uses HTML for newer attributes.
ArchitectureIn Backbone.js, you can find MVP architecture but it does not allow data binding.In Angular, the similar aspect is MVC architecture but it also allows two-day data binding for improved application activity.
DOMBackbone.js follows a direct DOM approach where the changes in architecture are made as per DOM.Angular prime space of working is HTML and as per the changes the redevelopment of DOM takes place.
PerformanceIn tiny data sets or small webpages, Backbone.js offers a substantial speed advantage over Angular.Angular has comparatively higher efficiency in terms of performance because of two-way data binding.
Community SupportBacked up by a great community of developers, there is continuous support on each problem.Developed by google and the support is impeccable for Angular framework.

11. Conclusion

They say Knowledge has no limits and so, that doesn’t mean that this blog will continue. Our effort to make that the angular developers get their dream job comes to an end here. We hope that through this one, we were able to clear all your fundamentals of Angular. We have tried and covered everything that includes the basics, latest version, advantages, latest features and some inevitable component descriptions. This blog on angular interview questions shows clear difference between angular and angular.js and backbone.js. Our last advice to the candidates will be to be confident on what they know and showcase during the interview. Angular is a top-programming language used by many developers and if so, if you want to be one of them, prepare yourself with the best basics and thumb rules. 

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Itesh Sharma

Itesh Sharma is core member of Sales Department at TatvaSoft. He has got more than 6 years of experience in handling the task related to Customer Management and Project Management. Apart from his profession he also has keen interest in sharing the insight on different methodologies of software development.

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