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React JS Commands and Useful purposes  To Install react app: npx create-react-app app-name To Install react app: npx create-react-app . To check npm version: npm --version Inside that directory, you can run several commands:   npm start     Starts the development server.   npm run build     Bundles the app into static files for production.   npm test     Starts the test runner.   npm run eject     Removes this tool and copies build dependencies, configuration files     and scripts into the app directory. If you do this, you can’t go back! node -v (To check node version)

ReactJS JSX   React is a modular, scalable, flexible, and popular front-end framework. What is JSX? JSX is a syntax extension for JavaScript. It was written to be used with React. JSX code looks a lot like HTML. What does “syntax extension” mean? In this case, it means that JSX is not valid JavaScript. Web browsers can’t read it! If a JavaScript file contains JSX code, then that file will have to be compiled. This means that before the file reaches a web browser, a JSX compiler will translate any JSX into regular JavaScript. Codecademy’s servers already have a JSX compiler installed, so you don’t have to worry about that for now. Eventually we’ll walk through how to set up a JSX compiler on your personal computer. JSX is a syntax extension for JavaScript which allows us to treat HTML as expressions. const h1 = <h1>Hello world</h1>; They can be stored in variables, objects, arrays, and more! Here’s an example of several JSX elements being stored in an object: const ...