Interview questions for Angular 8

Angular is one of the foremost frameworks, has released its latest version namely Angular 8 on 23rd of May, 2019. The latest version of Angular is incorporated with unique and attractive features. In general, Angular 8 supports new and unique features such as CLI (Command Line Interface), core framework, and angular material library.

1. What is Angular 8?

Angular 8 is the latest version which is released on May 28, 2019, by the Angular community. It is the most prominent client-side TypeScript based framework that is mainly used to create dynamic web applications. Angular 8 is very much similar to the previous version of Angular but has some more added features. You can even upgrade your Angular CLI to Angular version 8 very easily.

2. What is the purpose of Wildcard route?

Wildcard routing is used in Angular 8 for defining the route of pages. Specific changes/updates can be made when defining the route using Wildcard.

3. List the key features of Angular 8?

• The key features of Angular 8 are as follows:
• Differential Loading to create two different production bundles of your app.
• New Dynamic Lazy Loading modules for imports.
• Supports Web Workers.
• Supports TypeScript version 3.4.
• Availability of New Workspace APIs and Builder.
• Bazel Support.
• Opt-In usage sharing.
• Ivy Rendering Engine: The new compiler for Angular version 8.

4. What are the new features in angular 8?

Angular 8 it has following new features such as
• Differential loading- It is a technique that automatically makes your angular applications more performant. When you build applications for production, two bundles are created- One bundle for Modern browsers that support ES6+ and another bundle for older browsers that only support ESS.
• Dynamic imports for lazy routes- In Angular version 8 there is nothing new in the concept of lazy routes itself but the syntax has totally changed. In the older version of Angular CustomString Syntax is used, but angular 8 uses standard dynamic import syntax so the syntax which is customized to Angular is migrated to industrial standard.
• Ivy rendering Engine- It translates the templates and components into regular HTML and javascript that the browser can interpret and understand.
• Bazel- It is a building tool through which angular developer can build backends and frontends.

5. What is the main purpose of a Bazel in Angular 8?

Bazel is one of the key features present in Angular version 8. It always allows you to build CLI applications quickly. Bazel is considered a built tool that is developed and mostly used by Google as it can build applications in any language. The entire Angular framework is built with Bazel. Moreover, Bazel allows you to break an application into different build units which are defined at the NgModule level.

6. Why we used Service Workers in Angular?

A Service Worker is used in Angular 8 to build the basic steps of converting an application into a Progressive Web App (PWA). Service workers function as network proxies and intercepting all outgoing HTTP requests made by the application and how to respond.

7. What are the advantages of Bazel?

The following are the key advantages of Bazel, and they are as follows:
• It provides you the possibility to make both frontends and backends with the same tool.
• Availability of incremental build and test options.
• In Bazel, you have the possibility for cache and remote builds on the build farm.

8. How to install Angular 8?

Steps for the Installation of Angular 8 environmental setup
Before installing Angular IDE using Angular CLI tool, make sure that Node.js has already installed in your system.

If Node.js is not installed in your system install it using the following steps.
o The basic requirement of Angular 8 is Node.js version 110.9.0 or later.
o Download it using https//nodejs.org/en/
o Install it on your system
o Open node.js command prompt
o Check the version run command, node-v in the console window

9. What are the limitations of web workers in Angular 8?

The web workers in Angular version 8 are mainly used to speed up the work of the things in your application during the working of CPU. These web workers mainly allow you to run the CPU computations in a background thread. This, in turn, helps the main thread to free up and then update the user interface.

10. What is a SPA?

Single Page Application (SPA) is a type of web application or website that dynamically reloads selected page elements in line with user interactions in order to avoid fetching entire new pages from a server. This can dramatically improve the speed and overall flow of a digital experience.
Example of Single Page Application:
• Netflix
• Gmail
• Facebook
• Twitter

11. What is NgUpgrade in Angular 8?

NgUpgrade is the library present in the Angular version 8. This upgrade library is mainly used to integrate both AngularJS and Angular components in the application. Moreover, NgUpgrade also helps you in bridging the gap between the Dependency Injection Systems in both AngularJS and Angular.

12. What’s the difference between an Angular component and module?

Components control views HTML. They also communicate with other components and services to bring functionality to your app:
Modules consist of one or more components. As well as they do not control any HTML. As well as the modules declare which components can be used by components belonging to other modules, which classes will be injected by the dependency injector and which component gets bootstrapped. Secondly, Modules allow you to manage your components to bring molecularity to your app.

13. What is Angular Material?

It is a UI component library. Angular Material helps in creating attractive, consistent, and fully functional web pages as well as web applications. Also, it does so while following modern web design principles, including browser portability and graceful degradation.

14. Why Incremental DOM is Tree Shakable?

In Angular 8, the framework does not interpret components in an incremental DOM. It uses component references instructions, and if it does not refer to a particular instruction, it shall be left unused. Now, VIrtual DOM requires an external interpreter. Hence, not knowing which components to display, everything is shifted to the browser, making the DOM shakeable.

15. What is the AOT (Ahead-Of-Time) Compilation?

Each Angular app gets compiled internally. The Angular compiler takes in the TypeScript code, compiles it and then produces some JavaScript code. As well as, this happens only when, once per occasion per user. It is known as AOT (Ahead-Of-Time) compilation.