React Warm-Up

Business Scenario

During the planning phase of a modern web application, the development team gathered to decide the best frontend technology for their new project.

A junior employee confidently suggested:

 Employee:
Sir, we can build this project using HTML, CSS, and JavaScript. Why do we need React?

 Manager:
That’s a valid question. For small static websites, those technologies are sufficient. However, our project is dynamic and requires scalability, where React provides clear advantages.

Manager:
Additionally, state management in React allows the UI to automatically update when data changes, reducing manual effort and minimizing errors.

 Manager:
Overall, React makes applications scalable, maintainable, and efficient, making it the preferred choice for modern web development.

Manager:
React follows a component-based architecture, allowing us to build reusable UI elements like forms, cards, and navigation. This improves development speed and code maintainability.

 Manager:
It also uses a Virtual DOM, which ensures that only the necessary parts of the UI are updated instead of reloading the entire page — resulting in better performance.

Pre-Lab Preparation

  • What is React?

  • What is Vite?

  • Node.js and npm basics

  • SPA (Single Page Application)

  • Folder Structure in React

Task 1: Installation of Node.js (Prerequisite)

1

Open any browser (Chrome recommended)

2

Paste this URL:https://nodejs.org

3

Click on Download (LTS version)

  • Node.js website with Download button visible

  • Click on Window Installer (.msi)

4

Open downloaded .msi file

5

Click on Next

6

Accept License Agreement

7

Select a check box of Automatically Installed Necessary Tools.

8

Click Next → Next → Install

9

Click Finish

10

Press Any Key and Hit Enter.

11

Wait For 10- 15 Minutes thenPress Enter to Exit

12

Open Command Prompt and type

node -v
npm -v

  • Command prompt showing versions

Task 2: Create React App using Vite

1

Open Command Prompt / PowerShell / VS Code Terminal

  • Terminal opened (blank screen)

2

Run the following command:

npm create vite@latest

Command typed in terminal

3

Press Enter

The system will prompt you to enter details.

4

Enter Project Name = shopkart

Press Enter

  • Project name entered (shopkart)

5

Select Framework

You will see options like:

  • Vanilla

  • Vue

  • React

  • Others

6

Select Variant

You will see:

  • TypeScript

  • JavaScript

Use arrow keys and select React

Press Enter

  • React option selected

Select JavaScript

Press Enter

JavaScript selected

7

The project setup will start automatically.

Project creation completed in terminal

8

Navigate to the project folder:

cd shopkart

cd command executed

9

Install project dependencies:

npm install

10

Open Folder where your project was located

Right click - Open with Vs code

Right click on src - Open Integrated Terminal

Run the development server:

npm run dev

Server started with localhost URL

11

Open your browser and paste:

http://localhost:5173

Default React + Vite application running

12

Remove all code in App.jsx

Print Hello world in Functional Component

Check Browser again

 

Great job!

  • Created a React project using Vite

  • Selected React framework and JavaScript variant

  • Installed dependencies using npm

  • Started the development server

  • Successfully viewed the application in the browser

Checkpoint

Next-Lab Preparation

  • React Folder Structure

  • JSX Basics

  • Components in React

  • Props and State

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