ANGULAR 5 INTERVIEW QUESTIONS

Most Important Frequently Asked 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.

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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.

4. 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.

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5. 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

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6. 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.

7. 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.

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8. 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’;

9. 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.

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10. Question 10. What Do Double Curly Brackets Are Used In Angular 5?

    Answer :

    double curly brackets are used form data interpolation in Angular 5.

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11. 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.

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12. Question 12. Explain Webpack?

    Answer :

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

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13. 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.

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14. 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

15. Question 15. Explain Ngmodule?

    Answer :

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

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Topic: Angular 5 Interview Questions