use routes in flutter code example

Example 1: named routes flutter

MaterialApp(
    routes: {
      '/':(context)=>HomePage(),
      '/meals':(context)=>MealsPage(),
      '/orders':(context)=>Orders(),
    },
    );

Example 2: routes in flutter

Navigator.push(
    context,
    MaterialPageRoute(builder: (context) => SecondRoute()),
  );