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# `useAsyncFn`
React hook that returns state and a callback for an `async` function or a
function that returns a promise. The state is of the same shape as `useAsync`.
## Usage
```jsx
import {useAsyncFn} from 'react-use';
const Demo = ({url}) => {
const [state, doFetch] = useAsyncFn(async () => {
const response = await fetch(url);
const result = await response.text();
return result
}, [url]);
return (
<div>
{state.loading
? <div>Loading...</div>
: state.error
? <div>Error: {state.error.message}</div>
: <div>Value: {state.value}</div>
}
<button onClick={() => doFetch()}>Start loading</button>
</div>
);
};
```
## Reference
```ts
useAsyncFn<Result, Args>(fn, deps?: any[], initialState?: AsyncState<Result>);
```
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