Search results
Results from the WOW.Com Content Network
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.
React Components. Components are independent and reusable bits of code. They serve the same purpose as JavaScript functions, but work in isolation and return HTML. Components come in two types, Class components and Function components, in this tutorial we will concentrate on Function components.
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 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.
The useEffect Hook allows you to perform side effects in your components. Some examples of side effects are: fetching data, directly updating the DOM, and timers. useEffect accepts two arguments. The second argument is optional. useEffect(<function>, <dependency>) Let's use a timer as an example.
function Goal (props) { const isGoal = props.isGoal; if (isGoal) { return <MadeGoal/>; } return <MissedGoal/>; } const root = ReactDOM.createRoot (document.getElementById ('root')); root.render (<Goal isGoal= {false} />); Run Example ». Try changing the isGoal attribute to true:
Components are independent and reusable bits of code. They serve the same purpose as JavaScript functions, but work in isolation and return HTML via a render () function. Components come in two types, Class components and Function components, in this chapter you will learn about Class components.
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:
Use React Router to route to pages based on URL: index.js: import ReactDOM from "react-dom/client"; import { BrowserRouter, Routes, Route } from "react-router-dom"; import Layout from "./pages/Layout"; import Home from "./pages/Home"; import Blogs from "./pages/Blogs"; import Contact from "./pages/Contact"; import NoPage from "./pages/NoPage ...