how to write ref in class component react.js code example

Example: use ref in component reactjs

function MyFunctionComponent() {  return <input />;
}

class Parent extends React.Component {
  constructor(props) {
    super(props);
    this.textInput = React.createRef();  }
  render() {
    // Ça ne fonctionnera pas !
    return (
      <MyFunctionComponent ref={this.textInput} />    );
  }
}