11 Sample Angular Interview Questions and Answers

Angular is the leading application development platform for creating interactive and dynamic single-page apps and is often used by both web developers and computer programmers. If you’re looking for a job in web or software development, be prepared to answer Angular interview questions. Monster will walk you through the questions on Angular you might get asked and how you can answer them.

There is a high demand for computer professionals who possess Angular skills. For example, the Bureau of Labor Statistics projects an increase of 23% in new web development jobs over the next ten years.

If you’re experienced with Angular, you likely already mentioned it on your web developer resume. However, employers will want to know more about your Angular experience if it’s an important part of your new role. To help you demonstrate your Angular know-how, we’ve outlined 11 sample Angular interview questions and answers below. Take some time to practice responding to each question, so you know what you’re going to say in advance.

11 Angular Interview Questions

1. Tell Me What You Know About Angular.
2. What Are the Building Blocks of an Angular Application?
3. What Is TypeScript?
4. Explain How Data Binding Works in Angular.
5. What Is AngularJS and How Does It Differ From Angular?
6. What Is the Scope in AngularJS?
7. Describe How Routing Works in AngularJS.
8. Walk Me Through the AngularJS Bootstrap Process.
9. How Does Angular 8 Differ From Previous Versions?
10. Describe the Angular 8 Architecture.
11. Explain What Bazel Does in Angular 8.

Fundamental Angular Interview Questions

First, we’ll start with the fundamental Angular interview questions employers will ask. These include the basics and building blocks of Angular, TypeScript, and data binding.

Question #1: Tell Me What You Know About Angular.

First and foremost, employers will ask you to demonstrate your basic understanding of Angular. Create your answer by including the following details:

• A brief overview of Angular.
• Why developers use Angular.
• The key features of Angular.

How You Could Answer

“Angular is a free and open-source TypeScripted-based web application framework. Google released it in 2016 to create single-page applications using TypeScript, HTML, CSS, and the Angular command-line interface tool.

Angular’s consistent structure allows developers to create web pages and single-page apps without having to rebuild code from scratch. It also provides a comprehensive model-view-controller framework and document object model, so developers understand the ideal structure of an application.”

Question #2: What Are the Building Blocks of an Angular Application?

Angular uses specific building blocks that make it unique in the web dev tool space. While this seems like a simple question, your answer will demonstrate your proficiency in Angular programming.

When creating your answer, be sure to identify and explain the following details:

• The six building blocks in Angular applications.
• The purpose of each building block.

How You Could Answer

“An Angular application should include six key building blocks: modules, components, templates, metadata, services, and dependency injection. More specifically:

• An Angular app should have a root module to provide the bootstrap mechanisms to launch it. This is also called “AppModule.”
• Angular applications contain components that define the classes that hold the app data and logic. Components also define a portion of the user interface.
• Templates use data binding to combine Angular markup with HTML. This modifies HTML elements before displaying them on a web page or app.
• Angular uses metadata to process classes and configure their expected behavior.
• Angular creates a service class when data and/or logic isn’t associated with a view but must be shared across components.
• Lastly, dependency injection streamlines the use of component classes without fetching data from a server, logging to the console, or validating user input.”

Question #3: What Is TypeScript?

Since Angular works with TypeScript, employers will likely ask for a description of it. Your answer should include:

• A definition of TypeScript.
• How it works.
• Why developers prefer it over other programming languages.

How You Could Answer

“TypeScript is a high-level programming language developed by Microsoft. It’s a superset of JavaScript and the primary programming language for Angular. TypeScript uses static typing, which makes variables known at compile time. Additionally, TypeScript helps developers solve coding problems and monitor types of data in a way that JavaScript does not. It’s also converted into JavaScript using the TypeScript compiler.”

Question #4: Explain How Data Binding Works in Angular.

Data binding is an Angular process that affects how elements appear on the user interface. When employers ask Angular interview questions about data binding, be sure to explain:

• What data binding is and what it does.
• When developers typically use data binding.
• The two types of data binding.

How You Could Answer

“Data binding creates a connection between an application’s user interface (UI) and the corresponding data. Once the data values change, the UI elements also change. Developers use data binding on web pages and apps that have forms, games, tutorials, and other interactive components.

Angular uses two types of data binding: One-way data binding and two-way data binding. In one-way data binding, the data flows in one direction. This occurs when developers display information on a UI without the need to update it. In two-way data binding, the data flows in both directions. Developers use it to regularly update information that appears in UI elements.”

AngularJS Interview Questions

Before Angular, there was AngularJS. Below, you’ll find Angular interview questions about AngularJS, the very first version of the web development platform.

Question #5: What Is AngularJS and How Does It Differ From Angular?

While AngularJS shares some similarities with Angular, it has many key differences. Respond with the following information in mind:

• A description of AngularJS.
• The key purposes of AngularJS.
• How AngularJS compares to Angular.

How You Could Answer

“AngularJS is a structured framework for developing dynamic web pages and apps. Google released it in 2010 as the first version of the Angular framework. However, Google recently discontinued support for AngularJS and has recommended the latest Angular version.

AngularJS differs from Angular because it supports JavaScript rather than TypeScript. Plus, developers only use AngularJS to create web apps, while they use Angular for both web and mobile apps. AngularJS also doesn’t use dependency injections or come with a command-line interface like Angular.”

Question #6: What Is the Scope in AngularJS?

The Scope is key for binding JavaScript functions and HTML elements. If you’ve worked with AngularJS before, you should have a full understanding of how the Scope works. Demonstrate your knowledge of the Scope in your answer by including the following details:

• The purpose of the Scope.
• What the Scope comprises.
• The two types of scopes and what they do in AngularJS.

How You Could Answer

“In AngularJS, the Scope binds application data from HTML (view) and the JavaScript function that controls data (controller). The Scope also comprises app data and objects. AngularJS has two types of scopes: $Scope and $rootScope.

Developers pass $scope as an argument when creating a controller in AngularJS. The properties made in a controller can then be referred to in a view, allowing HTML to get access to them. All AngularJS applications have a $rootScope, which developers create on the HTML element containing an ng-app directive.”

Question #7: Describe How Routing Works in AngularJS.

Routing is important for user navigation in both AngularJS and Angular. If a hiring manager asks you Angular interview questions on routing, here’s what you should talk about:

• A description of what routing does.
• Why developers use routing.

How You Could Answer

“Developers use routing in AngularJS to allow users to navigate to different pages within an app. With routing, users create multiple URLs for different content within an app. The $routeProvider API configures routes within an app by accepting the when() or otherwise() method. It also helps to define which pages to display when users click on links.”

Question #8: Walk Me Through the AngularJS Bootstrap Process.

From AngularJS to Angular 14, each version performs a bootstrap process. AngularJS uses two processes: automatic and manual. When you’re asked Angular interview questions about how bootstrap works in AngularJS, be sure to provide the following details in your answer:

• The use of the ng-app directive in the automatic process.
• The angular.bootstrap() function in the manual process.
• A brief description of how each process differs.

How You Could Answer

“In the automatic process, AngularJS first needs the ng-app directive, the root of an angular app compilation, which defines the AngularJS part within a Document Object Model (DOM). Once AngularJS identifies the ng-app directive, it will load a module linked to the directive, create an application injector, and compile a DOM deriving from an ng-app root element.

Some developers choose the manual bootstrap process, which starts with the angular.bootstrap() function. This function then gets called within the angular.element(document).ready() function, which indicates that the DOM is prepared for manipulation. Unlike the automatic process, the manual process should not use the ng-app directive.”

Angular 8 Interview Questions

This last section will cover Angular interview questions on the 8th version of the platform. That includes how it differs from previous versions, the Angular8 architecture, Bazel, and reactive forms.

Question #9: How Does Angular 8 Differ From Previous Versions?

Google released Angular 8 in 2019. Even though it’s not the latest version, it’s still widely used among developers. When asked Angular interview questions about version 8, provide the following details:

• How Angular 8 compares to Angular 7.
• Features that make Angular 8 different from previous versions.

How You Could Answer

“Angular 8 comes with many features that previous versions don’t. For example, it works with TypeScript 3.4, while Angular 7 works with TypeScript 3.1. It uses lazy loading, which allows developers to load JavaScript components asynchronously upon activation of specific routes. Angular 7 simply uses drag and drop.

Additionally, Angular 8 comes with improved ng upgrades, such as the ng-new command that builds projects with Bazel. Other key features that differentiate Angular 8 from previous versions are its network robots, dynamic imports, differential loading, Angular Ivy Support, builder and workspace APIs, and opt-in usage sharing.”

Question #10: Describe the Angular 8 Architecture.

Each version of Angular uses a specific architecture for app development. When employers ask you to describe the architecture of Angular 8, be very specific with your answer. For example, you should discuss:

• The eight key parts of Angular 8.
• A description of what each part does in Angular 8.

How You Could Answer

“Angular 8’s architecture contains eight key parts: modules, components, templates, meta-data, data binding, directives, services, and dependency injection. More specifically:

• All Angular 8 apps have a root module called “AppModule.” This provides the bootstrap mechanism that Angular uses to launch applications.
• Each Angular app has at least one root component that links a page hierarchy with a page DOM.
• Templates in Angular 8 serve two purposes: they combine HTML with Angular Markup and alter HTML elements before displaying them.
• The meta-data for component classes associates them with a template that defines views. Meta for service classes provides Angular with information to them available to components via dependency injection.
• Angular 8 uses two types of data binding. Event binding binds app events and updates app data to respond to user input in the target environment. Property binding passes data from a component class and facilitates interpolate values from the app data to HTML.
• Directives define classes that add new behaviors to template elements and modify existing behaviors.
• Angular 8 uses service classes for data and logic that aren’t linked to a certain view. Service classes also allow unassociated data to be shared across all components.
• Dependency injection makes component classes more efficient and lean by rendering certain tasks to services.”

Question #11: Explain What Bazel Does in Angular 8.

If you’ve ever worked with Angular 8, you’re probably familiar with Bazel. When asked Angular interview questions about Bazel, here’s how to best structure your answer:

• Provide a brief description of Bazel.
• Explain why developers use it.

How You Could Answer

“Bazel is one of Angular 8’s key features. It’s an advanced build and test tool that streamlines the development of command-line interface applications. It allows developers to:

• Use the same tool to build front-ends and back-ends.
• Declare tasks with clear inputs and outputs.
• Have remote builds and cache on the build farm.
• Utilize dynamic imports for lazy-load modules.”

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