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Create React App. To learn and test React, you should set up a React Environment on your computer. This tutorial uses the create-react-app. The create-react-app tool is an officially supported way to create React applications. Node.js is required to use create-react-app.
React finds out what changes have been made, and changes only what needs to be changed. You will learn the various aspects of how React does this in the rest of this tutorial.
Get started for free . Start by including three scripts, the first two let us write React code in our JavaScripts, and the third, Babel, allows us to write JSX syntax and ES6 in older browsers. You will learn more about JSX in the React JSX chapter.
Hooks were added to React in version 16.8. Hooks allow function components to have access to state and other React features. Because of this, class components are generally no longer needed. Although Hooks generally replace class components, there are no plans to remove classes from React.
When creating a React component, the component's name MUST start with an upper case letter. Class Component. A class component must include the extends React.Component statement. This statement creates an inheritance to React.Component, and gives your component access to React.Component's functions.
React Props. React Props are like function arguments in JavaScript and attributes in HTML. To send props into a component, use the same syntax as HTML attributes:
Add React Router. To add React Router in your application, run this in the terminal from the root directory of the application: npm i -D react-router-dom. Note: This tutorial uses React Router v6. If you are upgrading from v5, you will need to use the @latest flag: npm i -D react-router-dom@latest.
We can embed JavaScript expressions in JSX by using curly braces: function Garage(props) { const cars = props.cars; return ( <> <h1>Garage</h1> {cars.length > 0 && <h2>. You have {cars.length} cars in your garage. </h2> } </> ); } const cars = ['Ford', 'BMW', 'Audi']; const root = ReactDOM.createRoot(document.getElementById('root'));
Create React Application. Facebook has created a Create React Application with everything you need to build a React app. It is a a development server that uses Webpack to compile React, JSX, and ES6, auto-prefix CSS files. The Create React App uses ESLint to test and warn about mistakes in the code.
Create a new file called "App.css" and insert some CSS code in it: body { background-color: #282c34; color: white; padding: 40px; font-family: Sans-Serif; text-align: center; } Note: You can call the file whatever you like, just remember the correct file extension. Import the stylesheet in your application:
