Lecture 63 :- React Advanced - Class 5

In "React Advanced - Class 5," we'll continue exploring more advanced React concepts and build on what we learned in the previous classes. We'll cover topics such as server-side rendering (SSR) with React, integrating with state management libraries, and handling advanced performance optimizations.

Step 1: Server-Side Rendering (SSR) with React

Server-Side Rendering is a technique that renders React components on the server and sends the fully rendered HTML to the client, improving the initial page load time and SEO.

For server-side rendering in React, you can use libraries like Next.js or react-server.

Step 2: Integrating with State Management Libraries (e.g., Redux)

State management libraries like Redux are commonly used with React to manage the application's state and handle complex data flow.

Here's a basic example of integrating Redux with React:

1. Install Redux and React Redux:

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npm install redux react-redux

1. Create a Redux store:

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// store.js import { createStore } from 'redux'; import rootReducer from './reducers'; const store = createStore(rootReducer); export default store;

1. Create reducers and combine them:

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// reducers/themeReducer.js const initialState = {  theme: 'light', }; const themeReducer = (state = initialState, action) => {  switch (action.type) {    case 'TOGGLE_THEME':      return {        ...state,        theme: state.theme === 'light' ? 'dark' : 'light',      };    default:      return state;  } }; export default themeReducer;

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// reducers/index.js import { combineReducers } from 'redux'; import themeReducer from './themeReducer'; const rootReducer = combineReducers({  theme: themeReducer, }); export default rootReducer;

1. Wrap your application with Provider:

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// index.js import React from 'react'; import ReactDOM from 'react-dom'; import { Provider } from 'react-redux'; import store from './store'; import App from './App'; ReactDOM.render(  <Provider store={store}>    <App />  </Provider>,  document.getElementById('root') );

1. Connect components with Redux:

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// Button.js import React from 'react'; import { connect } from 'react-redux'; import { toggleTheme } from './actions/themeActions'; const Button = ({ theme, toggleTheme }) => {  return (    <div>      <button onClick={toggleTheme}>{theme === 'light' ? 'Dark' : 'Light'}</button>    </div>  ); }; const mapStateToProps = (state) => ({  theme: state.theme.theme, }); const mapDispatchToProps = {  toggleTheme, }; export default connect(mapStateToProps, mapDispatchToProps)(Button);

Step 3: Advanced Performance Optimizations

Advanced performance optimizations in React involve techniques like memoization, virtualization, and code splitting to reduce the application's load time and improve responsiveness.

Some popular techniques include:

• Memoization with React.memo to prevent unnecessary re-renders of functional components.
• Using React.PureComponent or implementing shouldComponentUpdate in class components to avoid re-renders when props and state don't change.
• Virtualization libraries like react-virtualized or react-window to efficiently render large lists and grids.
• Code splitting with tools like React.lazy and React Suspense to load components on-demand and reduce the initial bundle size.
• Caching data with libraries like react-query to avoid redundant API calls and improve data fetching efficiency.

Keep in mind that the specific optimizations you use will depend on your application's needs and performance requirements. Profiling your application and using performance monitoring tools can help identify bottlenecks and areas for improvement.

Congratulations! You've completed the fifth class of React Advanced. You've learned about server-side rendering with React, integrating Redux for state management, and advanced performance optimizations.

React offers a wide range of tools and techniques to build performant and scalable applications. As you continue your React journey, you can explore more advanced topics like serverless architecture with React, testing and debugging React applications, and building custom hooks for reusable logic.

Keep practicing, building more complex applications, and exploring the vast possibilities of React! Happy coding!