What is the usage of useUnmount in hooks?

In React, the custom hook useUnmount in hooks is used to perform cleanup operations when the component is unmounted.

The useUnmount hook function can help us execute necessary cleanup tasks when a component is unmounted, such as unsubscribing, clearing timers, releasing resources, and so on.

Here is an example of how to use the useUnmount function:

import { useEffect } from 'react';

const useUnmount = (callback) => {
  useEffect(() => {
    return () => {
      callback(); // 在组件卸载时执行回调函数
    };
  }, []);
};

const MyComponent = () => {
  useUnmount(() => {
    console.log('Component unmounted'); // 组件卸载时执行的清理操作
  });

  return <div>My Component</div>;
};

In the example above, we defined a useUnmount hook function that takes a callback function as a parameter. During component unmount, the useEffect hook function inside useUnmount will return a cleanup function that will be called and execute the provided callback function when the component is unmounted.

In the MyComponent component, we use the useUnmount hook function to perform some cleanup operations. In this example, “Component unmounted” will be printed when MyComponent is unmounted.

By using useUnmount, you can ensure that necessary cleanup operations are performed when the component is unmounted, preventing potential memory leaks or other issues.