React is a JavaScript library for building user interfaces based on a component-driven architecture. To start working with React, a development environment must be set up using Node.js for runtime execution and a modern build tool like Vite or Create React App for project scaffolding and local development. JSX syntax, state management using hooks, and virtual DOM updates are core elements in writing React applications. Setting Up a React Development Environment To begin working with React, a development environment must be configured. This involves installing Node.js, selecting a package manager, and choosing a build tool that supports JSX and module-based development. Node.js acts as the local JavaScript runtime, while npm or yarn manages third-party packages. React projects require tools to compile JSX and ESNext features, serve modules locally, and rebuild the app efficiently during development. Installing Node.js and npm Install Node.js to access the JavaScript runtime and npm package manager. Use node -v and npm -v to verify the runtime and dependency manager versions. node -v npm -v Explanation: node -v : Displays Node.js version. npm -v : Confirms npm is installed. Choosing a Build Tool: Vite vs. create-react-app Select a build tool to scaffold the React project. Vite uses native ES modules for faster startup and instant HMR. Create React App relies on Webpack, resulting in slower builds and delayed HMR. Use Vite’s project generator to scaffold a React application with optimized defaults. The --template react flag initializes the project with React-specific configuration. Create a Vite project: npm create vite@latest my-react-app --template react Explanation: npm create vite@latest : Starts a Vite project. --template react : Uses React as the framework. Project Structure and Key Files The project directory contains source files, configuration, and dependencies. src/ holds application code, public/ serves static assets, and vite.config.js defines build behavior. package.json tracks metadata and dependencies. Post-setup directory: my-react-app/ ├── node_modules/ ├── public/ ├── src/ │ ├── App.jsx │ ├── main.jsx │ └── index.css ├── package.json └── vite.config.js Explanation: App.jsx : Main React component. main.jsx : Renders React into DOM. vite.config.js : Vite’s config file. Rendering a Basic Component Define a functional component in App.jsx that returns JSX output. Export the component to make it available for rendering in the application entry point. Edit App.jsx: function App() { return

Hello, React!

; } export default App; Explanation: function App() : Functional component. export default App : Enables import. Run the development server: npm run dev Explanation: npm run dev : Launches local server. Building Interactive Video Interfaces Interactive video interfaces in React depend on state tracking, event dispatching, and conditional rendering. Component trees handle playback state, metadata, and user input. Time-based updates synchronize UI elements with media events using requestAnimationFrame, useEffect, and controlled props. Integrating Video Playback with React Video playback integration in React uses native HTMLMediaElement APIs within JSX. Components encapsulate

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