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# `useInterval`
A declarative interval hook based on [Dan Abramov's article on overreacted.io](https://overreacted.io/making-setinterval-declarative-with-react-hooks). The interval can be paused by setting the delay to `null`.
## Usage
```jsx
import * as React from 'react';
import {useInterval} from 'react-use';
const Demo = () => {
const [count, setCount] = React.useState(0);
const [delay, setDelay] = React.useState(1000);
const [isRunning, toggleIsRunning] = useBoolean(true);
useInterval(
() => {
setCount(count + 1);
},
isRunning ? delay : null
);
return (
<div>
<div>
delay: <input value={delay} onChange={event => setDelay(Number(event.target.value))} />
</div>
<h1>count: {count}</h1>
<div>
<button onClick={toggleIsRunning}>{isRunning ? 'stop' : 'start'}</button>
</div>
</div>
);
};
```
## Reference
```js
useInterval(callback, delay?: number)
```
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