34 lines
804 B
Markdown
34 lines
804 B
Markdown
---
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title: React useComponentDidMount hook
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type: snippet
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tags: [hooks,effect]
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author: chalarangelo
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cover: highlands
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dateModified: 2021-10-13T19:29:39+02:00
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---
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Executes a callback immediately after a component is mounted.
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- Use the `useEffect()` hook with an empty array as the second argument. This will execute the provided callback only once when the component is mounted.
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- Behaves like the `componentDidMount()` lifecycle method of class components.
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```jsx
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const useComponentDidMount = onMountHandler => {
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React.useEffect(() => {
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onMountHandler();
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}, []);
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};
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```
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```jsx
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const Mounter = () => {
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useComponentDidMount(() => console.log('Component did mount'));
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return <div>Check the console!</div>;
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};
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ReactDOM.createRoot(document.getElementById('root')).render(
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<Mounter />
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);
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```
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