const {useReducer} = React;
const {render} = ReactDOM;

function Counter() {
  const ['???'] = useReducer('???');
  
  const increment = () => {};
  const decrement = () => {};
  
  return (
    <div>
      {count}
      <button onClick={increment}> +1 </button>
      <button onClick={decrement}> -1 </button>
    </div>
  )
}


render(<Counter />, document.getElementById('root'))