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# `useMap`
React state hook that tracks a value of an object.
## Usage
```jsx
import {useMap} from 'react-use';
const Demo = () => {
const [map, {set, setAll, remove, reset}] = useMap({
hello: 'there',
});
return (
<div>
<button onClick={() => set(String(Date.now()), new Date().toJSON())}>
Add
</button>
<button onClick={() => reset()}>
Reset
</button>
<button onClick={() => setAll({ hello: 'new', data: 'data' })}>
Set new data
</button>
<button onClick={() => remove('hello')} disabled={!map.hello}>
Remove 'hello'
</button>
<pre>{JSON.stringify(map, null, 2)}</pre>
</div>
);
};
```
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