example.dart

void main() {
  for (int i = 0; i < 5; i++) {
    print('hello ${i + 1}');
    getData(i + 1);
  }
}

Future<void> getData(int sec) async {
  await Future.delayed(Duration(seconds: sec));
  print("Merhaba");
}

// şu widget
class UIProductModel {
  final String imageUrl;
  final double price;
  final String name;

  UIProductModel(this.imageUrl, this.price, [this.name = ""]);
}

abstract class Strings {
  String get homeScreen;
  String get movieDetailScreen;
  String get titleCategories;
  String get titleCast;
  String sayHello(String name);
}

class ServiceProductModel extends UIProductModel {
  ServiceProductModel(
    String imageUrl,
    double price,
    String name,
  ) : super(imageUrl, price, name);
}

class UIDiscountedProduct extends UIProductModel {
  final double percent;

  UIDiscountedProduct(
    String imageUrl,
    double price,
    String name,
    this.percent,
  ) : super(
          imageUrl,
          price,
          name,
        );
}