32 lines
603 B
Markdown
32 lines
603 B
Markdown
---
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title: useUpdate
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tags: components,reducer,beginner
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firstSeen: 2021-09-24T05:00:00-04:00
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---
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Forces the component to re-render when called.
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- Use the `useReducer()` hook that creates a new object every time it's updated and return its dispatch.
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```jsx
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const useUpdate = () => {
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const [, update] = React.useReducer(() => ({}));
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return update;
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};
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```
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```jsx
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const MyApp = () => {
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const update = useUpdate();
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return (
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<>
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<div>Time: {Date.now()}</div>
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<button onClick={update}>Update</button>
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</>
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);
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};
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ReactDOM.render(<MyApp />, document.getElementById('root'));
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```
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