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10 Angular Interview Questions You Must Be Prepared For

March 21, 2022


What are the most frequently asked advanced Angular interview questions?

Angular is one of the most popular JavaScript frameworks widely used for application development. It’s a free and open-source framework based on TypeScript, developed by Google.

Angular has advantages while providing a standardized structure for developers to work with as a framework. It provides an easy and powerful way to build front-end web-based applications.

Freelancer.com, Netflix, GoodFilms and many other sites were built using Angular.

In this blog post, we’ll take a look at the most popular Angular interview questions and answers.

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10 Advanced Angular Interview Questions and Answers

1. Why was Angular introduced as a client-side framework?

Google has even open-sourced the Closure toolkit, a set of libraries and optimized compiler it uses to build Gmail.

The problem, however, was that Google’s Closure tools were not very developer-friendly.

Therefore, vanillaJS and jQuery have been used by developers to develop dynamic single-page applications.

As websites got more complex with added features and functionality, it became harder for developers to maintain code.
Therefore, Angular was created to solve these problems, making it easier for developers by breaking the code into smaller pieces of information known in Angular as Components.

2. What does subscribing mean in RxJS?

In RxJS, when using observables, we need to subscribe to use the data flowing through them.
This data is generated from a publisher and consumed by a subscriber. When subscribed, a message can be displayed or processed in case of an error.

In Angular applications, observables will connect to observers. When they observe new values or changes in data, they will run code with the help of Subscription, and all subscribed components will get updated results.

3. What is multicasting in Angular?

The task of responding to multiple subscribers with data is called multicast.
You can reuse the first listener and send values to each subscriber. Using multicast requires using an RxJS topic. Because observables are unicast, they don’t allow multiple subscribers. However, subjects allow multiple subscribers and are multicast.

4. What is a directive in Angular?

In Angular, directives provide the program with logic and make it understand how to modify the Document Object Model (DOM) during template creation.

A directive is used in Angular to extend the syntax and capabilities of a regular HTML view.

Angular ships with many directives. However, we can create our directives and let Angular know what they are doing, so the compiler knows them and uses them during the compilation step.

5. What is the role of SPA in Angular?

SPA stands for Single Page Application.
SPA technology is easy to create and extremely fast compared to traditional web technology.

It’s a web application that only loads a single web document and then updates the body content of that single document via JavaScript APIs such as XMLHttpRequest and Fetch when different content is shown.

6. What are the differences between AngularJS and Angular?

Angular JS is a Javascript open-source front-end framework mostly used for developing single-page web applications (SPA). It’s an ever-growing and expanding framework that provides better ways to develop web applications.

Angular is a popular open-source TypeScript framework created by Google for developing web applications. Front-end developers use frameworks like Angular or React to present and manipulate data efficiently.

However, there are important fundamental differences between Angular JS and Angular, such as:


Angular JS


Architecture It supports the Model-View-Controller design. It uses components and directives.
Written Language Written in JavaScript. Written in Microsoft’s TypeScript language, which is a superset of ECMAScript 6 (ES6).
Mobile support It does not support mobile browsers. Angular is supported by all popular mobile browsers.
Expression Syntax ng-bind is used to bind data from view to model and vice versa. Properties enclosed in “()” and “[]” are used to bind data between view and model.
Dependency Injection It does not use Dependency Injection. Angular is supported by all popular mobile browsers.
Routing AngularJS uses $routeprovider.when() for routing configuration. Angular uses @Route Config{(…)} for routing configuration.
Structure It is less manageable in comparison to Angular. It has a better structure compared to AngularJS; easier to create and maintain large applications, but falls behind AngularJS in the case of small applications.

7. How do you use HTTP interceptors?

HttpInterceptors are part of the @angular/common/http module and are used to inspect/convert HTTP requests and responses.

Blockers can be really useful for features like caching and logging.

To create an Interceptor, it’s necessary to implement the HttpInterceptor interface from the @angular/common/http package. Each time the application makes an HTTP request using the HttpClient service, the Interceptor calls the intercept() method.

8. What are the template and reactive forms?

Forms are a common feature used in any application.

Below are some of the differences between the two:

  • Template-driven forms rely on “FormsModule” while reactive forms rely on “ReactiveFormsModule”
  • Template-driven forms are asynchronous, whereas Reactive forms are mostly synchronous
  • In a template-driven approach, most of the logic is driven by the template, whereas in a reactive-driven approach the logic resides mainly in the component or typed code.

9. What is Angular CLI and how do I use it?

Angular CLI is a command-line interface.

Angular supports CLI tools that allow professionals to use them to add components, deploy them instantly, perform testing and other functions. All Webpack configuration is done entirely by the CLI and does not fall into the hands of the developer unless they choose to make the settings themselves.

Also, the CLI helps developers by creating code that follows the best practices defined by Angular’s main site.

10. What is the Angular Router?

The Angular Router is used to manage navigation from one view to another in a single page frontend application.
However, it provides navigation by interpreting a browser URL as an instruction to change the view.

You can define routes with matching components and let Angular handle the routing process.

Practice this Angular interview questions and nail that interview!


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