react-js-tutorial

React.js: A Beginner’s Guide to Building Modern Web Applications

React.js is a popular JavaScript library for building dynamic and interactive user interfaces. Developed by Meta (Facebook), React enables developers to create scalable and high-performance single-page applications (SPAs).

Discover more at RedSysTech React.js Guide.

What is React.js?

  • React.js is an open-source JavaScript library used for building UI components.
  • Developed by Facebook (Meta) and released in 2013.
  • Uses Virtual DOM for efficient rendering and performance.
  • Allows developers to create reusable UI components.

Learn more about What is React.js?.

Why Choose React.js for Web Development?

  • Component-Based Architecture – Build reusable UI elements.
  • Fast Rendering – Uses a Virtual DOM for optimized performance.
  • Strong Community Support – Backed by Meta and open-source contributors.
  • SEO-Friendly – Supports server-side rendering (SSR) with Next.js.

Explore Why Developers Choose React.js.

Setting Up React.js

1. Install Node.js & NPM

  • Download Node.js from nodejs.org.
  • Verify installation:
bash
node -v npm -v

2. Create a React App Using Create React App (CRA)

bash
npx create-react-app my-app cd my-app npm start

 

Learn How to Set Up React.js.

Understanding React.js Components

1. Functional Component

jsx
function Greeting() { return <h1>Hello,
React!</h1>
; }

2. Class Component

jsx
class Welcome extends React.Component {
render() {
return <h1>Welcome to React.js!</h1>;
}
}

 

Explore React.js Component Basics.

JSX – JavaScript XML in React.js

  • JSX allows writing HTML-like syntax inside JavaScript.
  • Example of JSX in React:
jsx
const element = <h1>Hello, JSX!</h1>;

Learn How JSX Works in React.js.

React.js State & Props

1. React Props (Passing Data to Components)

jsx
function Welcome(props) { return <h1>Hello, {props.name}!</h1>; }

2. React State (Managing Component Data)

jsx
React.js-Red9SysTech-1

React.js Lifecycle Methods

Lifecycle MethodPurposeExample
componentDidMount()Executes when the component is mountedFetching API data
componentDidUpdate()Runs when component updatesUpdating DOM elements
componentWillUnmount()Executes before component removalCleanup operations

Learn React Lifecycle Methods.

React Router – Navigation in React.js

1. Install React Router

bash
npm install react-router-dom

2. Create Routes

React.js-Red9SysTech-2

React.js vs Other Frontend Frameworks

FeatureReact.jsAngularVue.js
TypeLibraryFrameworkFramework
Learning CurveEasySteepModerate
PerformanceFastModerateFast
Best ForUI Components & SPAsEnterprise AppsSmall to Medium Projects

Check out React.js vs Angular vs Vue.

Real-World Applications of React.js

1. Social Media Apps

  • Facebook, Instagram use React for dynamic UIs.

2. E-Commerce Websites

  • Amazon, Shopify, Flipkart rely on React for fast shopping experiences.

3. Dashboards & Analytics

  • Used in admin panels and data visualization apps.

Explore React.js Use Cases.

Career Opportunities for React.js Developers

1. Frontend Developer

  • Works on UI development using React.js.

2. Full-Stack Developer

  • Uses React for frontend & Node.js for backend.

3. UI/UX Developer

  • Builds interactive and accessible web interfaces.

Explore React Developer Careers.

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