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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 NPM?

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

2) 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.

3) 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.

4) What are Decorators?

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

5) List the types of Data Binding supported by Angular5?

Angular 5 supports four types of Data Binding They are
String Interpolation
Property Binding
Event Binding
Two-way-binding

6) How to run Angular5 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

7) What an Angular5 component made of? How do you generate a new component?

Angular2 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 Angular2.

8) How do we import a module in Angular5?

Simply use below syntax to import a module in Angular5.
import { ModuleName } from ‘someWhere’;

9) 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.

10) What do double curly brackets are used in Angular5?

double curly brackets are used form data interpolation in Angular5.

11) 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.

12) Explain Webpack?

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

13)  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

14)  Explain component life cycle in Angular?

In Angular component life cycle in Angular goes through following stages.
-Create
-Render
-Create and render children
-Check for bound data changes and re-render
-Destroy

15)Explain NgModule?

NgModule is a decorator function in Angular that takes a single metadata object whose properties describe the module.

  1. What Is Angular 5? Whats new in it?
  2. Explain Bootstrapping in AngularJs?
  3. Explain service workers in Angular js?
  4. Explain how component routing works in Angular. How to define routes and sub-routes in Angular 5?