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27 lines
507 B
Markdown
27 lines
507 B
Markdown
# `usePrevious`
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React state hook that returns the previous state as described in the [React hooks FAQ](https://reactjs.org/docs/hooks-faq.html#how-to-get-the-previous-props-or-state).
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## Usage
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```jsx
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import {usePrevious} from 'react-use';
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const Demo = () => {
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const [count, setCount] = React.useState(0);
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const prevCount = usePrevious(count);
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return (
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<p>
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Now: {count}, before: {prevCount}
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</p>
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);
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};
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```
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## Reference
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```ts
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const prevState = usePrevious = <T>(state: T): T;
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```
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