CounterUseRef

import React, { useState, useEffect, useRef} from 'react'
import {Card} from 'antd'

function Counter() {
  const [count, setCount]=useState(0);

  useEffect(()=>{
    prevCountRef.current=count;
  })
  const prevCount=prevCountRef.current;

  return <Card> Now: {count}, before {prevCount}</Card>;
}

export default Counter;