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# `useMountedState`
> **NOTE!:** despite having `State` in its name **_this hook does not cause component re-render_**.
> This component designed to be used to avoid state updates on unmounted components.
Lifecycle hook providing ability to check component's mount state.
Returns a function that will return `true` if component mounted and `false` otherwise.
## Usage
```jsx
import * as React from 'react';
import {useMountedState} from 'react-use';
const Demo = () => {
const isMounted = useMountedState();
React.useEffect(() => {
setTimeout(() => {
if (isMounted()) {
// ...
} else {
// ...
}
}, 1000);
});
};
```
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