HandlingStateClassComponent.jsx

class CounterComponent extends React.Component {
 constructor(props) {
   super(props);
   this.state = {
     count: 0
   };
 }

 render() {
   return (
     <div>
       <p>Sudah di click : {this.state.count} kali</p>
       <button onClick={() => this.setState({ count: this.state.count + 1 })}>
         Click Saya
       </button>
     </div>
   );
 }
}