why react.memo code example

Example 1: import React, { memo } from 'react';

const MyComponent = React.memo(function MyComponent(props) {
  /* only rerenders if props change */
});

Example 2: how to add react.memo in export list

export const MemoMainPostTopic = React.memo(MainPostTopic);
 

//or

const MainPostTopic = memo(() => {
 ...
})
export { MainPostTopic };