Stateful Counter in React

Let's make a button click counter:

jsxfunction App() {
  const [count, setCount] = useState(0);
  
  function clickHandler() {
    setCount(count + 1);
  }
  
  return <div>
    <span>{count}</span>
    <button onClick={clickHandler}>+</button>
  </div>;
}

You can get rid of the handler function by replacing it with an anonymous arrow function:

jsxfunction App() {
  const [count, setCount] = useState(0);
  
  return <div>
    <span>{count}</span>
    <button onClick={() => setCount(count + 1)}>+</button>
  </div>;
}