Angular is a popular option when it comes to mobile and web app development. As such, many companies require app developers with good proficiency in Angular development. Hence, you should expect Angular interview questions coming your way while getting interviewed for the role of a mobile and/or web app developer.
Angular is a powerful JavaScript framework that’s gaining popularity fast. If you’re looking to get into the web development niche, it’s a good idea to brush up on the best Angular interview questions and answers before your next job interview!
Top Angular Interview Questions
Basic-Level
Q: What is the Angular framework?
A: The Angular framework is a JavaScript-based web application framework principally supported by Google. It facilitates the use of HTML as your template language and uses a combination of intrinsic model–view–controller (MVC) and dependency injection (DI) for developing an application.
Q: What are the various benefits of using Angular over other frameworks?
A: There are several benefits that Angular brings to the web development table. Some of the important ones are:
- Features out of the box
The Angular framework relies on the dependency injection pattern to provide features out of the box. This means that we don’t have to add extra code to our application in order for it to provide functionality that includes routing, XHR requests, or browser history tracking.
Instead of writing this code from scratch, by yourself, Angular provides it in a ready-to-use form and injects it into your custom modules as required.
- Declarative UI
Declarative UI, in simple terms, means you just need to declare what your component looks like in HTML and Angular will render it for you. It uses the Web Components standard, which is slowly gaining traction among modern browsers.
Q: What is the difference between Angular and AngularJS?
A:
| S. No. | Parameter | AngularJS | Angular |
| 1 | First appeared | 2010 | 2016 |
| 2 | Architecture | AngularJS uses Model-View-Controller or MVC architecture. Information is refined by the Controller and is shown in the View. | Angular puts back controllers with components, which are a way to configure directives. |
| 3 | Language | AngularJS is a powerful framework that uses the JavaScript programming language. | Angular is a framework for building web applications. It uses TypeScript, which is a statically-typed superset of JavaScript. |
Q: What are the key components of Angular?
A: Angular has the 5 key components:
- Component
An Angular component is a class used to define the behavior, look, and feel of a single part of an application. It can be thought of as a self-contained piece of functionality that performs a single operation or presents data in the application.
- Modules
Modules are the building blocks of Angular apps. Using a module, we can group related functionality together to make it easier to reuse.
- Templates
Templates are the driving force behind Angular. These are extremely powerful because they allow you to create dynamic templates that can be reused for multiple scenarios.
- Services
Services are among the most useful concepts in Angular. Not only can you use them for performing complex tasks, but they also enable you to build reusable components.
- Metadata
Metadata is data that describes some particular data. In other words, it is the data about data. The metadata service of Angular allows you to manually or automatically register custom metadata with your application.
Intermediate-Level
Q: What is the Angular CLI?
A: Angular CLI is a command-line tool that allows developers to generate projects, components, modules, guards, and pipes.
It also enables developers to run development, build-time, and continuous integration tasks on their Angular projects. You can install the Angular CLI using the following npm command:
npm install @angular/cli@latest
Q: Explain the various features of Angular.
A: Important features of Angular are:
- Accessibility Applications
Angular allows you to create accessible web applications using built-in tools and guidelines. Dialogs and prompts are now available within components, making it easier for users to interact with an application.
- Angular CLI
Angular CLI is a command-line interface tool with which you can perform several operations related to Angular like creating, updating, and deploying your applications or components.
- Animation Support
Animation in Angular is very powerful and allows you to easily build a UI that has life in it. Angular animations are done using the Web Animations API.
- Cross-Platform App Development
It is a front-end development framework that allows you to build web apps from scratch. Its unique capability is in making cross-platform app development a simple and easy task.
The Angular framework leverages the concept of directives, used to bind together various properties and functions of HTML documents and objects.
Q: What are the technologies used in Angular?
A: Angular uses TypeScript, a superset of JavaScript developed by Microsoft. Anything you can do in plain JavaScript, you can do in TypeScript, but we can write it better and catch bugs even before they exist. The web development framework also uses the RxJS library that makes handling asynchronous operations easier.
Q: What does data binding mean in Angular?
A: Data binding is a mechanism for synchronizing the state of an object with the value of a variable or expression in an associated view. The data in the view is always kept up to date with changes to the observable object.
Q: What is an AOT compilation in Angular?
A: The AOT Compiler does the heavy lifting so that you can build your application faster. It takes your Angular HTML and Typescript code and compiles it into JavaScript during the build phase, which results in much faster rendering. The compiler converts TS code into JS code, which then runs using the browser and runs an application.
Advanced-Level
Q: What are pipes in Angular?
A: Pipes in Angular are simple functions that transform values, or objects from the model layer to the view layer. They help us in reducing the complexity of our templates and thus provide readability to the code. Pipes not only enhance the language but also make it effortless for beginners to get started with Angular.
Q: What are observables in Angular?
A: In Angular, observables are an advanced technique that allows you to decouple data from your component code. They permit you to subscribe and listen to real-time updates from an Angular service using an observable API.
Q: What do you mean by Angular Material?
A: Angular Material is an open-source project driven by AngularJS. It allows web designers to create style sheets that will make website creation simpler for developers and easier to use for the users.
Q: Explain authentication and authorization in Angular.
A: Angular comes with built-in support for authentication and authorization. It’s important to note that authorization is applied per route meaning that it can be enforced at the level of a single view instead of applying globally.
If users are not allowed to access a route or view, then they will not be able to render the component associated with that route.
Q: What is the digest cycle process in Angular?
A: The digest cycle is the process the Angular framework uses to update the view with model changes. In simpler terms, it updates models with communication happening between controllers and templates occurring in two directions.
Q: What is an Angular Router?
A: An Angular Router is a vital part of Angular applications for organizing and maintaining large-scale apps better. It helps you to separate different parts of your application through routes, which are defined by the type of URL the route responds to.
In other words, an Angular Router is an AngularJS service that lets us create routes in our application, which is how the browser navigates from one page to another.
Conclusion
Hopefully, these Angular questions and answers will help you to understand the Angular framework and the things that it can do. Also, by getting familiar with these commonly asked interview questions, it will become easier for you to crack a job interview for the role of Angular developer. All the best!
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Hi! I am Pankaj, a full-time content specialist and a part-time programmer and marketer. I love to explore new places and also new ideas. I am an inquisitive person with a passion to learn new skills through every possible opportunity that comes in the way.