Angular 5 Interview Questions

1. Question 1. Explain Npm?
   Answer :
   NPM stands for node package manager. It is used for installing dependencies for javascript packages.
2. Question 2. What Is Angular Cli? List The Command To Install Angular Cli?
   Answer :
   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. Question 3. How To Create A New Project In Angular Js Using Cli?
   Answer :
   After installing Angular CLI run ng new project-name command to create a new Angular project.

1. Question 4. What Are Decorators?
   Answer :
   Decorators are functions that adds metadata to class members and functions. It was proposed in ES2016 and implemented in Typescript.
2. Question 5. List The Types Of Data Binding Supported By Angular 5?
   Answer :
   Angular 5 supports four types of Data Binding They are
   1. String Interpolation
   2. Property Binding
   3. Event Binding
   4. Two-way-binding
3. Question 6. How To Run Angular5 Application Locally During Development?
   Answer :
   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.

1. Question 7. What An Angular 5 Component Made Of? How Do You Generate A New Component?
   Answer :
   Angular2 component is made of a Component decorator and a component definition of a class. ng generate component componentname command is used to generate a component in Angular2.
2. Question 8. How Do We Import A Module In Angular 5?
   Answer :
   Simply use below syntax to import a module in Angular 5.
   import { ModuleName } from ‘someWhere’;
3. Question 9. Explain $event In Angular 5?
   Answer :
   In Angular 5 $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.

1. Question 10. What Do Double Curly Brackets Are Used In Angular 5?
   Answer :
   double curly brackets are used form data interpolation in Angular 5.
2. Question 11. What Is *ngfor Directive Used For?
   Answer :
   ngFor directive is used for Iterating over a list of items and for Generating a new DOM element for each one.
3. Question 12. Explain Webpack?
   Answer :
   Webpack is module bundler Bundler for Angular2 or above. It bundles, minified and transpiler an Angular application.

1. Question 13. What Is Transpiling?
   Answer :
   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.
2. Question 14. Explain Component Life Cycle In Angular?
   Answer :
   • 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
3. Question 15. Explain Ngmodule?
   Answer :
   NgModule is a decorator function in Angular that takes a single metadata object whose properties describe the module.