React memo

React forwardref

const FancyButton = React.forwardRef((props, ref) => (
  <button ref={ref} className="FancyButton">
    {props.children}
  </button>
));

// You can now get a ref directly to the DOM button:
const ref = React.createRef();
<FancyButton ref={ref}>Click me!</FancyButton>;

Source: reactjs.org

React memo

/* this is for es6 onward */
/* React.memo is the new PureComponent */

import React, { memo } from 'react'

const MyComponent = () => {
 return <>something</>
}

export default memo(MyComponent)

Import React, { memo } from 'react';

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

Source: reactjs.org

How to add react.memo in export list

export const MemoMainPostTopic = React.memo(MainPostTopic);
 

//or

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

Source: stackoverflow.com

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