React JS

Key Features of React.js

• Component-Based Architecture: Build encapsulated components that manage their own state and compose them to create complex UIs.
• Virtual DOM: Efficiently updates and renders only components that change, improving app performance.
• JSX (JavaScript XML): Enables writing HTML-like syntax directly within JavaScript code for defining UI structure.
• One-Way Data Binding: Ensures data flows in a single direction, making debugging and state management easier.
• React Hooks: Introduced in React 16.8+, Hooks like useState and useEffect allow functional components to use state and lifecycle features.
• Concurrent Rendering (React 18+): Enables better user experience with features like startTransition() and useDeferredValue().
• Server Components (React 19): Allow parts of the app to render on the server and stream to the browser, improving performance.
• Reusable & Declarative: React promotes reusable UI components and declarative code, improving readability and maintainability.
• Rich Ecosystem & Tooling: Works seamlessly with tools like Redux, React Router, Next.js, and libraries like Axios and Formik.
• Strong Community Support: Backed by Meta (Facebook) and a vast open-source community, ensuring long-term support and innovation.

Before Learning React.js

To get the most out of a React.js course, it’s important to have a solid foundation in the following web development concepts and tools:

• HTML & CSS: Understanding of page structure, tags, form elements, layout, and styling.
• JavaScript (ES6+):
  • Variables (let, const)
  • Functions (arrow functions)
  • Objects and Arrays
  • Array methods like map(), filter(), reduce()
  • Destructuring and Spread/Rest operators
  • Promises, async/await
• DOM Manipulation: Basics of how JavaScript interacts with HTML elements (querySelector, addEventListener).
• Basic Git & GitHub: Version control knowledge is useful for managing your code and collaborating.
• Node.js & npm: Basic understanding of how to install packages and run scripts using the command line.
• Browser DevTools: Inspecting elements, debugging JavaScript, and monitoring network activity.

If you are completely new to web development, it's recommended to first complete a JavaScript fundamentals course before starting React.js.

By learning React JS, you gain the following skills:

1: Getting Started with React 19

• What’s New in React 19
• React 19 vs React 18 – Key Differences
• Setting Up Project with Vite or CRA (React 19 enabled)
• Installing React 19 Beta and Tools

2: Core Concepts Recap

• JSX and Virtual DOM
• Components: Functional vs Class
• Props and State
• Event Handling and Conditional Rendering

3: Modern React Hooks

• useState, useEffect, useRef
• useContext and useReducer
• Custom Hooks

4: New Features in React 19

• Actions API: Server-side form handling
• useFormStatus and useFormState: New hooks for async form state
• Enhanced Server Components: Mixing client and server logic
• Web Components Support: Better interop with non-React elements
• Document Metadata: <title> and <meta> now in React tree

5: Routing with React Router v7+

• Setting up Routes and Layouts
• Lazy Loading with Suspense
• Protected Routes and Redirects

6: Working with Forms

• Controlled and Uncontrolled Inputs
• Form Validation with Libraries (Formik, Yup)
• React 19 Server Actions with Forms

7: State Management

• Local State vs Global State
• Context API with useContext
• Redux Toolkit (RTK)
• Zustand and Jotai (optional modules)

8: API Integration

• Fetching Data using Fetch / Axios
• Async/Await and Error Handling
• Data Caching with React Query or SWR

9: Server Components & Streaming

• Intro to React Server Components
• Rendering Streams
• Combining Server + Client Components

10: Testing in React

• Unit Testing with Jest
• React Testing Library Basics
• Testing Forms and Async Actions

11: Performance Optimization

• Memoization: useMemo, React.memo
• Code Splitting and Lazy Loading
• Analyzing Bundle Size

12: Deploying React 19 Apps

• Building the App for Production
• Environment Variables
• Deployment on Vercel, Netlify, Firebase

13: Capstone Project

• Building a Real-World App Using React 19
• Routing, Forms, API, and Server Actions
• Final Deployment and Presentation