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Last Updated: Jun 12, 2024

Angular 8 Interview Questions

Author Rupal Saluja
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Introduction

 Angular 8 is an open-source JavaScript framework used for Single Page front-end applications. It is a robust technology that is being widely used for app development, increasing the demand for Angular developers. It is one of the most known and used frameworks but quite vast and difficult to navigate. It becomes even more tedious when you lack knowledge on which parts you should familiarize yourself with. 

This quick guide on Angular 8 Interview Questions is going to help a lot if you are preparing for an interview regarding the same in the future.

Most Asked Angular 8 Interview Questions

1. What do you know about Angular 8?

In 2019, the Angular community has released the latest version of Angular, that is, Angular 8. Mainly used to create dynamic web applications, it is the most popular client-side Typescript-based framework. It is very much like other previous versions of Angular with some additional features. You can even upgrade to Angular 8 very easily from its previous versions.

2. Point out some differences between AngularJS and Angular.

Some differences between AngularJS and Angular are mentioned below in the table.

differences between AngularJS and Angular

3. Mention some features of Angular 8 which differentiate it from all of its previous versions.

Some prominent features of Angular 8 are-

  • New dynamic modules for Lazy Loading.
  • Support for web workers.
  • New Workspace APIs and Builder available.
  • Bazel Support.
  • Ivy-rendering engine.

 

4. What has made Angular so popular in the field of Modern Application Development?

There are many reasons that have made Angular so robust in the field of Modern Application Development. These reasons are-

  • Declarative templates
  • Dependency injection
  • End-to-end tooling

The integration of all these to resolve developers’ development challenges.

 

5. Tell me something about Bazel.

The known advantages of Bazel are as follows.

  • It makes it possible to create both frontends and backends with the same tool.
  • Incremental build and test options are available.
  • It makes it possible for cache and remote builds to be built on the build farm.

 

6. Why would anybody use WildCard Router in Angular?

For matching every URL as an instruction to get a clear client-generated view, we use WildCard Router in Angular. The Wildcard Route always performs its tasks at the end and that is why it comes at last. To define the routes of the pages in Angular 8, WildCard Router is mainly used.

7. Is there any way to check the type of value assigned to a given variable in Angular 8?

Yes, we can use ‘typeofchecks’ to check the type of value assigned to a given variable in Angular 8. It is quite similar to what we used in JavaScript. 

8. What do you know about Promises in Angular 8?

Promises deal with a single asynchronous event at a time and thus, they provide only a single value. These execute immediately after creation and therefore, cannot be considered lazy. 

Promises are not cancellable. They push their errors to the child promises.

9. Share some insights on Observables.

Observables handle a series of asynchronous events for a certain duration. These can be both synchronous and asynchronous and hence, emit multiple values. Since observables are not executed until you subscribe to them, they are considered lazy. These subscriptions can be canceled using the unsubscribe() method. Observables do not deliver errors to subscribers.

10.  List key parts of Angular 8 Architecture.

The key parts of Angular Architecture are mentioned below in the list.

Angular 8 Architecture

 

11. Explain the concept of Subscribing.

An observable instance will only publish values when someone subscribes to it. The subscribe() method is used to allow subscriptions that will pass an observer object to receive the notifications.

12. What do you mean by Components?

The most basic UI building block of Angular is known as the Component. These components are subsets of directives but unlike directives, components always have a template.

13. Is there anything like ‘NgUpgrade’ in Angular 8?

NgUpgrade is the library present in Angular version 8. This library prominently integrates both AngularJS and Angular components in the application. Basically, this library helps you to bridge the gap between the Dependency Injection Systems of both AngularJS and Angular.

14. Can you explain Event Binding with the help of an example?

To look after the handling of events that are raised from DOM like mouse move, button click, etc., the Event Binding technique is used in Angular 8. Whenever any DOM event occurs, only a specified method is called in the component at that particular moment.

15. Do you have any idea about NgModules?

There is at least one module called AppModule that is present in each and every Angular app. NgModules provide a bootstrap sort of mechanism to launch different applications. A Prominent feature that differentiates NgModules from other JavaScript Modules is its functionality. The functionality is such that it can be exported which can be used by other modules and also, it can import functionalities from other NgModules.

16. Describe Codelyzer.

On the top of the TSLint, there is present an open-source tool which is known as Codelyzer. To verify Angular TypeScript 3.4 projects and whether they follow the set of linting rules or not, we use Codelyzer. Basically, its main purpose is to check the quality and correctness of the program.

17. Why do we need Angular 8 components?

Angular 8 components are lists of classes with decorators. They mainly mark their own types and provide metadata to guide Angular to do its work. Each application of Angular has at least one component known as its root component, which is mainly used for forming connections between page hierarchy and page DOM.

18. Try to explain String Interpolation with an example.

String Interpolation is kind of a one-way data-binding technique that is used to generate output or extract data from a TypeScript coding to the HTML template view layer. The representation is in the form of curly braces. This technique of interpolation adds the value of property to the component.

The most basic example of String Interpolation can be-

{{data}}

19. Define Data Binding.

To build the communication between the DOM and the TypeScript code of any component, Data Binding is used. This technique not only links the data to the view layer but also defines interactive applications in the easiest manner. The two types of Binding available are-

  • One-way binding
  • Two-way binding

 

20. Define Directives. Name its types.

For adding behavior to an existing DOM element or to an existing component, we use directives. There are prominently three types of directives and they are-

  • Components
  • Structural directives
  • Attribute directives

 

21. What is nglf directive?

The nglf directive is a type of structural directive present in Angular version 8. To add or remove HTML elements based on the expression statement, we use this directive. Like, if the expression statement is true, an element is added but if the expression statement is true, an element is removed mainly using nglf directive.

22. Why Angular 8 forms are used? Name two approaches.

We use Angular 8 forms to handle the user’s input. It facilitates tasks like enabling the user to log in, enter personal information, update profile, perform data entry, etc. It collects the user’s inputs from the view layer and provides a way for tracking changes.

There are two approaches that we use to handle user’s input are-

  • Reactive approach
  • Template-driven approach

 

23. Why reactive forms are widely used? Explain.

Reactive forms are preferred when the forms are considered as the key part of the application. These are used mainly because it offers the features mentioned below-

  • Testability and Scalability
  • Reusability
  • Robustness

 

24. Is there anything like Template-driven forms?

Template-driven forms are very easy to use, but they are not scalable. We need template-driven forms in the following cases-

  • For adding a simple form to your application.
  • In such applications where we require a very basic logic.

 

25. Define AOT. Why did apps compile with AOT run fasters?

AOT stands for Ahead-of-Time compiler in Angular 8. The application components and their templates are pre-compiled by AOT during the build process.

The several reasons why apps compiled with AOT run faster are-

  • It doesn’t entertain unused Angular directives.
  • Templates being embedded as code within their components doesn’t require client-side requests.
  • Application components compiled using AOT execute immediately.

Check this out, Kotlin Interview Questions

26. Share some insights on Angular Universal.

The process of Server-Side Rendering (SSR) of any application to HTML present on the server is known as Angular Universal. Since all the Angular applications are single-page applications, rendering always occurs on the browser.

27. What is ngFor directive?

To repeat a portion of the HTML Template once per item from an iterable list, we use the Angular ngFor directive. It is a structural directive similar to ngRepeat in AngularJS. Certain local variables such as odd, even, first, last, and index are exported by ngFor directive.

28. Describe ‘typeofchecks’ briefly.

As the name suggests, ‘typeofchecks’ are used to check the type of value assigned to the variable. It plays an important role in Angular 8 because it can even test the value assigned to the object.

29. Can we upgrade an older version of Angular on a system that has already been installed with the Angular 8 version? If yes, then how?

Yes, we can upgrade an older version of Angular to Angular version 8 by following the steps mentioned below.

  • Firstly, check the older version of Angular that you are using by running the ng_version command on the command prompt.
  • Then, uninstall the older version. Also, verify and clear the cache.
  • Now, install the latest version of Angular whichever you want.
  • Again, verify it using the ng_version command.

 

30. What features of Angular 8 have helped it enhance its performance over previous ones?

features of Angular 8

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Frequently Asked Questions

Provide the syntax to create an app in Angular 8.

The syntax to create an app in Angular 8 would be-

ng new app_name


Mention the command used to install Angular CLI.

The command used to install Angular CLI would be-

npm install -g @angular/cli

 

Will Angular 8 support the TypeScript version 3.4?

Yes, Angular 8 surely supports the TypeScript version 3.4. This is because it is used to run Angular 8 projects. Each and everything written in Angular version 8 is in TypeScript.

What is Ivy?

Ivy is a Rendering Engine. It opted as the code name for the next generations. It was released as Opt-in in Angular 8, but by default, Ivy is considered the rendering engine in Angular 9.

Conclusion

We believe that you gained some insights on Angular 8 Interview Questions through this article. We hope that this will help you excel in your interviews and enhance your knowledge regarding Angular 8 and related stuff. These Angular 8 Interview Questions and answers are suitable for freshers as well as experienced candidates.

This set of Angular 8 interview questions will not only help you in interviews but also would increase your understanding regarding the same.

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Happy Coding!

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