<div id="app"></div>

const {useState } = React

function Counter(){

 let [number,setCount ] = useState(0);

   return (
       <div>
        <h1>{number}</h1>
        <button onClick={()=>setCount(number+1)} >Increment</button>
        <button onClick={()=>setCount(number-1)} >Deccrement</button>
       </div>
   )
}

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