React navigation example JS grammar

Question

I don't understand where is the navigation from (line 46-48 ):

https://github.com/react-community/react-navigation/blob/master/examples/NavigationPlayground/js/StacksOverTabs.js

Answer 1

const MyHomeScreen = ({ navigation }) => ( <MyNavScreen banner="Home Screen" navigation={navigation} /> );

等于

class MyHomeScreen extends React.Component{

constructor(props){
    super(props);
}

render(){

    const {navigation} = this.props;

    return <MyNavScreen banner="Home Screen" navigation={navigation} />
}}