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A component's unmounting period occurs when the component is removed from the DOM. This could happen if the DOM is rerendered without the component, or if the user navigates to a different website or closes their web browser.

componentWillUnmount is the only unmounting lifecycle method!

componentWillUnmount gets called right before a component is removed from the DOM. If a component initiates any methods that require cleanup, then componentWillUnmount is where you should put that cleanup.

You can see an example in Example.js, as usual.

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