React makes it painless to create interactive UIs. Design simple views for each state in your application, and React will efficiently update and render just the right components when your data changes.

React 是什麼？ React 是一個陳述式、高效且具有彈性的 JavaScript 函式庫，用以建立使用者介面。 它讓你使用小巧而獨立的「component」，來建立複雜的 UI。 React 有數種不同的 component，但讓 …

If you choose not to assign an explicit key to list items then React will default to using indexes as keys. Here is an in-depth explanation about why keys are necessary if you’re interested in learning more.

Our React applications continuously modify the HTML DOM during runtime, sometimes leading to keyboard focus being lost or set to an unexpected element. In order to repair this, we need to …

React は、インタラクティブなユーザインターフェイスの作成にともなう苦痛を取り除きます。 アプリケーションの各状態に対応するシンプルな View を設計するだけで、React はデータの変更を検知 …

Note that this functionality is not a part of React, but provided by third-party libraries. React does not have an opinion about how styles are defined; if in doubt, a good starting point is to define your …

We recommend using React Testing Library which is designed to enable and encourage writing tests that use your components as the end users do. For React versions <= 16, the Enzyme library makes …

To solve this problem for React users, React 16 introduces a new concept of an “error boundary”. Error boundaries are React components that catch JavaScript errors anywhere in their child component …

In this guide, we will examine the building blocks of React apps: elements and components. Once you master them, you can create complex apps from small reusable pieces.

In React apps, whether a component is stateful or stateless is considered an implementation detail of the component that may change over time. You can use stateless components inside stateful …