Angular 8 Interview Questions and Answers

Last updated on Feb 07, 2024
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Angular 8 Interview Questions

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. Angular 8 Interview Questions contain these important questions and answers. Read them carefully and score well.

Quick Facts About Angular 8
What is the latest version of Angular? Angular 11.0 released on 11th November 2020
When did the Angular 8 release? 28th May 2019
What language does Angular use? TypeScript
Who is the developer of Angular 8? Google

This is a list of the most frequently asked Angular 8 interview questions and answers. Please have a good read and if you want to download it, it is available in a PDF format so that you can brush up your theoretical skills on this subject.

Most Frequently Asked Angular 8 Interview Questions

Here in this article, we will be listing frequently asked Angular 8 Interview Questions and Answers with the belief that they will be helpful for you to gain higher marks. Also, to let you know that this article has been written under the guidance of industry professionals and covered all the current competencies.

Q1. What is the difference between Angular 7 and Angular 8?
Angular 7 Angular 8
Angular 7 is difficult to use Angular 8 is easier to use
It has features such as Virtual scrolling, CLI prompts, Application performance, Drag, and drop, Bundle budget, Angular compiler, Angular elements, NativeScript, Better error handling, etc. It has unique and advanced level features such as Differential Loading, Ivy rendering Engine, API builders, Bazel support, Support for $location, Router backward compatibility, Opt-In Usage sharing, web- workers, etc.
Breaking changing in Angular 7 are- Component Dev Kit (CKD), Material design library and virtual scrolling. Breaking changing in Angular 8 are- Core framework, Angular, material library and CLI.
It will support a lower version of typescript version 3.4. It will not support a lower version of typescript version 3.4.
It supports all types Node.js version It supports Node.js version 12 or later
Q2. What is bazel in Angular 8?

In Angular 8, Bazel is a new build system and it is available for a short period of time. It is the new feature of Angular 8, which provides a platform to make your backends and frontends with a similar tool. It has the possibility to have remote builds as well as cache on the build farm.

The main features of Bazel are-
  • It is an internal build tool, through which application can be customized.
  • It also tests the action and performance of multiple machines.
  • It constructs a graph through which you can identify the useful information.
  • It also supports customization.
Related Interview Questions: Angular 9 Interview Questions
Q3. 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.

Q4. What is the difference between promise and observable in angular8?
Observables Promises
Both synchronous as well as asynchronous Always asynchronous
Can emit multiple values Provides only one single value
It is lazy It is eager
Q5. What is the purpose of Codelyzer?

Codelyzer is an open-source tool in Angular 8 whose main function is to check for errors in codes not following pre-defined guidelines. It runs on the tslint.json file and checks only the static code in Angular 8.

Q6. 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.
Q7. What are the limitations of Web Workers?
Here are the limitations of a Web Worker:
  • A web worker cannot directly manipulate the DOM
  • It has limited access to methods and properties of the window object.
  • It cannot be run directly from the file system. A web worker needs a server to run.
Q8. How Performance Improvements on the core in Angular 8?

Angular 8 has advanced level features which ensure systematic workflow and performance improvements. It has apparent features such as differential loading, CLI workflow improvements, Dynamic imports for lazy routes, Ivy rendering engine, Bazel, etc.

Q9. 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.

Q10. How to upgrade angular 7 to 8?
Steps to upgrade Angular 7 to 8
  • Install TypeScript 3.4
  • Use Node LTS 10.16 or its advanced version
  • Run command on terminal panel/CLI -> ng update @angular/cli@angular/core

Alternative- use URL link-

Reviewed and verified by Umesh Singh
Umesh Singh

My name is Umesh Singh having 11+ experience in Node.JS, React JS, Angular JS, Next JS, PHP, Laravel, WordPress, MySQL, Oracle, JavaScript, HTML and CSS etc. I have worked on around 30+ projects. I lo...