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useComponentWillUnmount react Code Snippet in 2024

hookseffectbeginner

Last Updated: 20 May 2024

Executes a callback immediately before a component is unmounted and destroyed.

  • Use the useEffect() hook with an empty array as the second argument. Return the provided callback to be executed only once before cleanup.
  • Behaves like the componentWillUnmount() lifecycle method of class components.
const useComponentWillUnmount = onUnmountHandler => { React.useEffect( () => () => { onUnmountHandler(); }, [] ); };
const Unmounter = () => { useComponentWillUnmount(() => console.log('Component will unmount')); return <div>Check the console!</div>; }; ReactDOM.render(<Unmounter />, document.getElementById('root'));

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