component-sample.js

class ExampleComponent extends React.Component {
 constructor() {
  super();
  this. _handleClick = this. _handleClick.bind(this);
 }
 render() { 
  return <div onClick={this._handleClick}>Hello, world.</div>;
 }
 _handleClick() {
  console.log(this); // this is an ExampleComponent
 }
 
 const boundHandleClick = () => {
  console.log(this); // this is an ExampleComponent
 }
}