[Solved]-What is this syntax of defining a method in a React component with ES6-Reactjs

class MyComponent extends React.Component {
  constructor() {
    super();
    this.handleClickEvent = this.handleClickEvent.bind(this);
    //                                           ^^^^^^^^^^^
  }

  handleClickEvent() {
    this.setState({value: evt.target.value});
  }

  render() {
    return <div onClick={this.handleClickEvent} />;
  }
}