What is React and How Does it Work?

ReactNovember 23, 20243,120 viewsBy Muhammad Fareed

reactjavascriptfrontendcomponents

What is React?

React is a JavaScript library for building user interfaces, particularly single-page applications where you need a fast, interactive user experience.

React applications are built using components - reusable pieces of UI.

function Welcome(props) {
  return <h1>Hello, {props.name}</h1>;
}

React uses a virtual DOM to optimize rendering performance. It compares the virtual DOM with the actual DOM and updates only what changed.

JSX is a syntax extension that looks like HTML but works in JavaScript.

const element = <h1>Hello, world!</h1>;

const [count, setCount] = useState(0);

useEffect(() => {
  document.title = `Count: ${count}`;
}, [count]);