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.
Declarative views make your code more predictable and easier to debug.
Build encapsulated components that manage their own state, then compose them to make complex UIs.
We don’t make assumptions about the rest of your technology stack, so you can develop new features in React without rewriting existing code.
React can also render on the server using Node and power mobile apps using React Native.
React components implement a
render() method that takes input data and returns what to display. This example uses an XML-like syntax called JSX. Input data that is passed into the component can be accessed by
In addition to taking input data (accessed via
this.props), a component can maintain internal state data (accessed via
this.state). When a component’s state data changes, the rendered markup will be updated by re-invoking
state, we can put together a small Todo application. This example uses
state to track the current list of items as well as the text that the user has entered. Although event handlers appear to be rendered inline, they will be collected and implemented using event delegation.
React is flexible and provides hooks that allow you to interface with other libraries and frameworks. This example uses remarkable, an external Markdown library, to convert the
<textarea>’s value in real time.