What Is React ?

A JavaScript library for building user interfaces 🏆 it is declarative

• Components: React is built around the concept of components, which are self-contained UI elements that can be reused throughout your application.

• Virtual DOM: React uses a virtual representation of the DOM, which is more efficient than directly manipulating the actual DOM.

• State management: React provides a way to manage state with in components, which makes it easier to build complex UIs.

• JSX: React uses a syntax extension called JSX, which allows you to write HTML-like code within your JavaScript files.

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Setup React App On Local Machine

Install Node First https://nodejs.org/en/

npm update

npm install -g npm@latest

1.method using npm

npm init react-app tech-app
cd tech-app
npm start

2.method using npx

npx create-react-app tech-app
cd tech-app
npm start

3.method using npm vite

npm create vite@latest
cd tech-app 
npm install
npm run dev

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• JSX (JavaScript XML) is a syntax extension used in React to describe the structure of user interface components in a more concise and intuitive way. It allows you to write HTML-like code directly in your JavaScript files, which is then transformed into JavaScript objects by the transpiler (such as Babel) before it's run by the browser.

In other words, JSX is a way to write React components using a syntax that closely resembles HTML. For example, instead of writing:

const element = React.createElement(
  'h1',
  { className: 'greeting' },
  'Hello, world!'
);

You can write the same thing using JSX like this:

const element = <h1 className="greeting">Hello, world!</h1>;

• In this example, the JSX code is transformed into the same React.createElement call that we wrote before.

• JSX allows you to easily compose complex UI components using a familiar syntax. It also allows you to use JavaScript expressions within the markup, which enables dynamic and data-driven rendering of UI components.

• While JSX is not required to use React, it has become a widely adopted convention within the React community because of its many benefits

module 1

1. Hello World
2. Introducing JSX
3. Rendering Elements
4. Components and Props
5. State and Lifecycle
6. Handling Events
7. Conditional Rendering
8. Lists and Keys
9. Forms
10. Lifting State Up
11. Composition vs Inheritance
12. Thinking In React

React Index File

Import export

"use strict";
ReactDOM.render( /*#__PURE__*/React.createElement("h1", null, "Welcome to react App"), document.getElementById('root'));

Short Code

rfc

rafc

https://medium.com/@alimubashar74/react-native-what-is-the-difference-between-functional-and-class-components-25b4920c1686

Getting Started with Create React App

This project was bootstrapped with Create React App.