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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.
Current version of React.JS is V18.0.0 (April 2022). Initial Release to the Public (V0.3.0) was in July 2013. React.JS was first used in 2011 for Facebook's Newsfeed feature. Facebook Software Engineer, Jordan Walke, created it. Current version of create-react-app is v5.0.1 (April 2022).
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.
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.
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.
Handling forms is about how you handle the data when it changes value or gets submitted. In HTML, form data is usually handled by the DOM. In React, form data is usually handled by the components. When the data is handled by the components, all the data is stored in the component state. You can control changes by adding event handlers in the ...
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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.
React has four built-in methods that gets called, in this order, when mounting a component: constructor () getDerivedStateFromProps () render () componentDidMount () The render () method is required and will always be called, the others are optional and will be called if you define them.
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:
