1class App extends React.Component {
2  constructor(props) {
3      super(props);
4
5      this.state = {};
6   }
7
8  // React says we have to define render()
9  render() {
10    return <div>Hello world</div>;
11  }
12};

1here is only one reason when one needs to pass props to super():
2
3When you want to access this.props in constructor.
4
5