Angular 5 Interview Questions

Find Top Angular 5 interview questions and answers

Below are the list of angular 5 interview questions and their answers

#1 Explain service workers in Angular js?

#2 What are Decorators?

Decorators are functions that adds metadata to class members and functions. It was proposed in ES2016 and implemented in Typescript.

#3 Explain component life cycle in Angular?

 In Angular component life cycle in Angular goes through the following stages.

  • Create
  • Render
  • Create and render children
  • Check for bound data changes and re-render
  • Destroy

#4 What is *ngFor directive used for?

*ngFor directive is used for Iterating over a list of items and for Generating a new DOM element for each one.

#5 Explain Bootstrapping in AngularJs?

AngularJS reads the HTML and compiles it into an internal representation, this reading and compiling is called bootstrapping.

When you write the code to execute the bootstrapping instead of using ng-app directive then it is called manual bootstrapping.

#6 How to create a new project in angular js using CLI.

After installing Angular CLI run ng new project-name command to create a new Angular project.

#7 What is transpiling?

Transpiling is a process of converting code from one language to another. In Angular, Traceur compiler is used for converting TypeScript to JavaScript so that browsers can understand.

Also, Read Interview questions asked in React Js  Interviews

#8 Explain how component routing works in Angular. How to define routes and sub-routes in Angular 5?

#9 What is Angular CLI? List the command to install Angular CLI?


Angular CLI is Command Line Interface for Angular that runs Webpack.You can use npm install -g @angular/cli command to install angular CLI.

#10 What an Angular 5 component made of ? How do you generate a new component?

Angular5 component is made of a Component decorator and a component definition of a class. ng generate component component_name command is used to generate a component in Angular5.

#11 How to run Angular 5 application locally during development?

ng serve command is used to run Angular5 application locally during development. To start development server on specific port ng serve -p aPortNumber command is used.

Also, Read Best  Angular 2 interview questions 2017

#12 Explain $event in Angular5?

In Angular5 $event is a reserved keyword that represents the data emitted by an event (event data).It is commonly used as a parameter for event based methods.

#13 Explain NPM?

 NPM stands for node package manager. It is used for installing dependencies for javascript packages.

#14 List the types of Data Binding supported by Angular 5?


Angular 5 supports four types of Data Binding They are

  • String Interpolation
  • Property Binding
  • Event Binding
  • Two-way-binding

#15 Explain Webpack?

Webpack is module bundler Bundler for Angular2 or above. It bundles, minifies and transpiles an Angular application.

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