# `useSpring`

React animation hook that updates a single numeric value over time according
to spring dynamics.

## Usage

```jsx
import useSpring from 'react-use/lib/useSpring';

const Demo = () => {
  const [target, setTarget] = useState(50);
  const value = useSpring(target);

  return (
    <div>
      {value}
      <br />
      <button onClick={() => setTarget(0)}>Set 0</button>
      <button onClick={() => setTarget(100)}>Set 100</button>
    </div>
  );
};
```

Note: Because of dependency on `rebound` you have to import this hook directly like shown above.

## Requirements

Install [`rebound`](https://github.com/facebook/rebound-js) peer dependency:

```bash
npm add rebound
# or
yarn add rebound
```

## Reference

```js
const currentValue = useSpring(targetValue);
const currentValue = useSpring(targetValue, tension, friction);
```