Dart - The basics in pratice

main.dart

main () { 
  final shopping = new ShoppingCart (); 

  // the use of the reserved word new is optional as of DART 2.0 
  // and we will not use it in the next lines 
  final pen = Product("Caneta", true, 4.75); 
  shopping.addItem(pen); 

  final pencil = Product("Pencil", false, 1.25); 
  shopping.addItem(pencil); 

  print ("Total purchase: $ {shopping.total ()}"); 
}