function Example(){
   const [a,setA] = React.useState(0);
  const [b,setB] = React.useState(0); const [c,setC] = React.useState(0);
   let i=0;
  const memoizedCallback = React.useCallback(
      msg => {
        console.log(msg,a);
        setA(a+1);
        i++;
        if (i%3==0){
          setB(b+1);
          setC(c+1);
        }
      },
      [b,c]
  ) return (<React.Fragment> <button onClick={()=>memoizedCallback('Hi there: ')}>{a}</button>
  <button onClick={()=>setB(b+1)}>{b}</button> </React.Fragment>);} ReactDOM.render(<Example/>,document.querySelector("div"));