React Introduction

What is React?

React is a JavaScript library created by Facebook for building user interfaces. It’s especially useful for single-page applications that need to efficiently update and render as data changes.

Key Concepts

• JSX: A syntax that looks like HTML but it’s used within JavaScript to describe the UI.
• Components: The basic building blocks of React applications. Can be either class-based or functional.
• State: An object that holds data that can change over time.
• Props: Short for properties, props are used to pass data from one component to another.

Advantages

• Declarative: Makes it easy to design interactive UIs.
• Component-Based: Promotes reusable code and better maintenance by breaking the UI into smaller, manageable pieces.
• Virtual DOM: Enhances performance by only updating the parts of the DOM that need to change.

Getting Started

1. Install React using npm:

   npm install react

   npm install react

2. Create your first component:

   import React from 'react';

   function Welcome() {
     return <h1>Hello, World!</h1>;
   }

   export default Welcome;

   import React from 'react';

​

   function Welcome() {

     return <h1>Hello, World!</h1>;

   }

​

   export default Welcome;