These docs are old and won’t be updated. Go to react.dev for the new React docs. The new documentation pages teaches React with Hooks. Hooks are a new addition in React 16.8. They let you use state and other React features without writing a class. This page answers some of the frequently asked questions about Hooks. Adoption Strategy Which versions of React include Hooks? Do I need to rewrite all

These docs are old and won’t be updated. Go to react.dev for the new React docs. These new documentation pages teach modern React and include live examples: Reusing Logic with Custom Hooks Hooks are a new addition in React 16.8. They let you use state and other React features without writing a class. Building your own Hooks lets you extract component logic into reusable functions. When we were lea

These docs are old and won’t be updated. Go to react.dev for the new React docs. These new documentation pages teach React with Hooks: Quick Start Tutorial react: Hooks Hooks are a new addition in React 16.8. They let you use state and other React features without writing a class. import React, { useState } from 'react'; function Example() { // Declare a new state variable, which we'll call "count

These docs are old and won’t be updated. Go to react.dev for the new React docs. These new documentation pages teach modern React and include live examples: Synchronizing with Effects You Might Not Need an Effect useEffect Hooks are a new addition in React 16.8. They let you use state and other React features without writing a class. The Effect Hook lets you perform side effects in function compon

These docs are old and won’t be updated. Go to react.dev for the new React docs. These new documentation pages teach modern React: <Fragment> A common pattern in React is for a component to return multiple elements. Fragments let you group a list of children without adding extra nodes to the DOM.

This blog site has been archived. Go to react.dev/blog to see the recent posts. We’re happy to announce the release of React 0.14 today! This release has a few major changes, primarily designed to simplify the code you write every day and to better support environments like React Native. If you tried the release candidate, thank you – your support is invaluable and we’ve fixed a few bugs that you

These docs are old and won’t be updated. Go to react.dev for the new React docs. These new documentation pages teach modern React: React.Component This page contains a detailed API reference for the React component class definition. It assumes you’re familiar with fundamental React concepts, such as Components and Props, as well as State and Lifecycle. If you’re not, read them first. Overview Reac

These docs are old and won’t be updated. Go to react.dev for the new React docs. PropTypes aren’t commonly used in modern React. Use TypeScript for static type checking. Note: React.PropTypes has moved into a different package since React v15.5. Please use the prop-types library instead. We provide a codemod script to automate the conversion. As your app grows, you can catch a lot of bugs with typ