function Example() {
   const [count, setCount] = React.useState(0);
   return (<div><p>Counter: {count}</p>
                <button onClick={() => {
                  setCount(count+1);  // asynchronous
                  setCount(count+1);  // still gets the old ‘count’ value
                }}>+1</button>
                    <button onClick={() => {
                  setCount(count+1);
                  setCount(c=>(c+1));  // waits for previous update first
                }}>+2</button>
                <button onClick={() => {
                  setCount(count+1);
                  setCount(c=>(c+1));  // asynchrnous too
                  setCount(count+1);   // still gets the initial ‘count’ value
                }}>+1</button>
           </div>);}ReactDOM.render(<Example/>,document.querySelector("div"));