![]() ![]() Transitions are a new concurrent feature introduced in React 18. In the future, it will support other use cases like data fetching. Today, Suspense only supports one use case: loading components dynamically with React.lazy. Suspense lets components “wait” for something before rendering. React also provides a component for rendering multiple elements without a wrapper. React provides several APIs for manipulating elements: See Using React without JSX for more information. You will not typically invoke the following methods directly if you are using JSX. Each JSX element is just syntactic sugar for calling React.createElement(). ![]() We recommend using JSX to describe what your UI should look like. React components can also be defined as functions which can be wrapped: See Using React without ES6 for more information. If you don’t use ES6 classes, you may use the create-react-class module instead. React components can be defined by subclassing React.Component or React.PureComponent. React components let you split the UI into independent, reusable pieces, and think about each piece in isolation. If you use ES5 with npm, you can write var React = require('react'). If you use ES6 with npm, you can write import React from 'react'. If you load React from a tag, these top-level APIs are available on the React global. React is the entry point to the React library. These new documentation pages teach modern React:
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