React Hooks

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import React, { useState } from 'react';

function Example() {
  // Declare a new state variable, which we'll call "count"
  const [count, setCount] = useState(0);

  return (
    <div>
      <p>You clicked {count} times</p>
      <button onClick={() => setCount(count + 1)}>
        Click me
      </button>
    </div>
  );
}

This new function useState

is the first “Hook” we’ll learn about, but this example is just a teaser. Don’t worry if it doesn’t make sense yet!

NoteReact 16.8.0 is the first release to support Hooks. When upgrading, don’t forget to update all packages, including React DOM. React Native has supported Hooks since .

import React, { useState } from 'react';

function Example() {
  // Declare a new state variable, which we'll call "count"
  const [count, setCount] = useState(0);

  return (
    <div>
      <p>You clicked {count} times</p>
      <button onClick={() => setCount(count + 1)}>
        Click me
      </button>
    </div>
  );
}

Crucially, Hooks work side-by-side with existing code so you can adopt them gradually.

There is no rush to migrate to Hooks. We recommend avoiding any “big rewrites”, especially for existing, complex class components. It takes a bit of a mind shift to start “thinking in Hooks”. In our experience, it’s best to practice using Hooks in new and non-critical components first, and ensure that everybody on your team feels comfortable with them. After you give Hooks a try, please feel free to , positive or negative.