React is a JavaScript library for building user interfaces.
React is used to build single-page applications.
React allows us to create reusable UI components.
Learning by Examples
Our "Show React" tool makes it easy to demonstrate React. It shows both the code and the result.
Example:
import { createRoot } from 'react-dom/client';
function Hello() {
return (
<h1>Hello World!</h1>
);
}
createRoot(document.getElementById('root')).render(
<Hello />
);
Learning by Exercises
Many chapters in this tutorial end with an exercise where you can check you level of knowledge.
React Quiz
Test your React skills with a quiz.
What You Should Already Know
Before you continue you should have a basic understanding of the following:
- HTML
- CSS
- JavaScript
If you want to study these subjects first, find the tutorials on our Home page.
In addition, you should also have some experience with the new JavaScript features introduced in ECMAScript 6 (ES6), you will learn about them in the React ES6 chapter.