Angular 6 Interview Questions and Answers

Last updated on Feb 07, 2024
  • Share
Angular 6 Interview Questions

Angular 6, released in May 2018, is backward compatible with Angular 5. This means projects created in Angular 5 will work seamlessly with Angular 6. Angular 6 has introduced the developers to a unique feature - Angular elements. This is an essential topic in Angular 6 Interview Questions for experienced professionals and freshers. This feature will allow the developers to render their Angular elements as essential web elements and will be looked upon as trusted HTML elements.

Features of Angular 6
  • Bazel compiler
  • Ivy renderer
  • Addition of elements
  • Component Development Kit with stable Angular material
  • The support for TypeScript 2.7+
  • NgModelChange event
  • Addition of multiple validators for FormBuilder’s array method
  • CLI 1.7 support and its feature addition
  • Update for ng
Quick Facts About Angular 6
What is the latest version of Angular? Angular 11.0 released on 11th November 2020
When did angular 6 release? 4th May 2018
Who is the developer of Angular 6? Google
When was Angular first released? Angular 2.0 and released on 14th September 2016
License MIT License
What language does Angular use? TypeScript

Most Frequently Asked Angular 6 Interview Questions

Here in this article, we will be listing frequently asked Angular 6 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.

Q31. What is difference between JIT and AOT in Angular 6?
Loads the application slower than AoT since it needs to compile the application when running for the first time Loads the page more quickly than the JiT compilation
It downloads the compiler and compiles the application before displaying it. It doesn't want to download the compiler since AoT already compiles the code when building the application
Since the code includes the compiler code also the bundle size will be higher. Since it created fully compiled code and its optimized so it bundles size will be half the bundle size compiled by JiT
Suitable in development mode Suitable in the case of production
Following command use JiT ng build, ng serve Following command use AoT ng build --aot, ng serve --aot, ng build -- prod
Template binding errors can be viewed at the time of displaying the application. Template binding errors are shown at the time of building.
Q32. What is the use of Async pipe in Angular 6?

The async pipe in Angular 6 is a special kind of impure pipe which either waits for a promise to resolve, display the data or subscribe to an observable displaying the emitted values. The Async pipe saves the boilerplate into the component model.

Q33. What is the use of subscribe in Angular 6?

In Angular 6, the subscribe() is used as a method in the Observable type. This is a type that is used as a utility for asynchronously and synchronously streaming data to a variety of components that have been subscribed to the observable.

Q34. What are pipes in Angular 6?

In Angular 6, Pipes are a way to declare HTML components by writing display-value transformations. A pipe usually takes the original data as input and transforms it into the desired output format.

Q35. What is HttpClient and its benefits in Angular 6?

The HTTPClient in Angular 6 offers a simplified version of client HTTP API for applications in Agular resting on the XMLHttpRequests interface exposed by the end-user in the browser.

Benefits of HTTPClient:
  • Included Testability Features
  • Typed Requests and Response Objects
  • Requests and Response Interception
  • Observable APIs and a method of streamlined and efficient error handling
Q36. What is the use of observable in Angular 6?

In Angular 6, Observables are things/components you wish to observe and take action in the future. Angular 6 uses the Observer pattern, which means that observable objects are first registered, meanwhile other objects observe them and take appropriate action as and when an action is taken on them.

Q37. What is the use of RxJS in Angular 6?

RxJS or Reactive Extensions for JavaScript is used in Angular 6 as a reactive streams library which allows you to work upon asynchronous data streams. It can be used both on the browser and server-side.

Q38. What is multicasting in Angular 6?

In Angular 6, Multicasting is the method of broadcasting multiple subscribers within a single execution to send values out to reach each subscriber

Q39. What is the use of router outlet in Angular?

In Angular 6, a router-outlet is used to function as a placeholder that loads the different components dynamically based on the current route state and activated component.

Q40. Why we need compilation process in Angular?

Due to a mix of code in the components ad the templates, integrating them needs a compiler. Hence, in Angular 6, a compiler is used.

Angular 6 Interview questions are always a level up and thus a little tough to crack. In the Updated Angular Command Line Interface or CLI, new commands have been added such as ng-update for migrating from previous versions to the current version.

The updated Component Development Kit or CDK supports the creation of custom UI elements without the need for a material library. It also promotes responsive website layouts.

The new multiple validators will allow the developers to include various validators on a form builder. Angular 6 also includes the updated Rxjs library, which means developers can enjoy the newest features in the latest version of RxJS 6 in their Angular app. If you are scrolling on the web for angular 6 interview questions and answers pdf, then this guide will gonna help you.

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...