future: response,
  builder: (context, snapshot) {
    if (snapshot.connectionState == ConnectionState.waiting) {
      return const CircularProgressIndicator(); // Yuklanmoqda ⏳
    } else if (snapshot.hasError) {
      return Text("Xatolik yuz berdi: ${snapshot.error}"); // Xatolik ❌
    } else {
      return Text(
        snapshot.data ?? "Ma'lumot yo‘q", // Ma'lumot yo‘q bo‘lsa 😢
        style: const TextStyle(fontSize: 18),
      );
    }
  },
)

  double _balance = 0; // Private (yashirin) o‘zgaruvchi

  // Getter - faqat o‘qish uchun
  double get balance => _balance;  

  // Deposit - pul qo‘shish
  void deposit(double amount) {
    if (amount > 0) {
      _balance += amount;
    }
  }

  // Withdraw - pul yechish
  void withdraw(double amount) {
    if (amount > 0 && amount <= _balance) {
      _balance -= amount;
    }
  }
}

void main() {
  BankAccount account = BankAccount();
  account.deposit(1000); // 1000 so‘m qo‘shildi
  account.withdraw(500); // 500 so‘m yechildi
  print("Hisobingiz: \${account.balance} so‘m"); // 500 so‘m
}

class Animal {
  void makeSound() {
    print("Noma’lum tovush");
  }
}

// Dog sinfi Animal dan meros oladi
class Dog extends Animal {
  @override
  void makeSound() {
    print("Vov-vov!"); // Itning ovozi
  }
}

// Cat sinfi ham Animal dan meros oladi
class Cat extends Animal {
  @override
  void makeSound() {
    print("Miyov-miyov!"); // Mushukning ovozi
  }
}

void main() {
  Animal myDog = Dog();
  Animal myCat = Cat();

  myDog.makeSound(); // "Vov-vov!"
  myCat.makeSound(); // "Miyov-miyov!"
}

abstract class Payment {
  void processPayment(double amount);
}

// Click to‘lov tizimi
class ClickPayment extends Payment {
  @override
  void processPayment(double amount) {
    print("✅ Click orqali $amount so‘m muvaffaqiyatli to‘landi.");
  }
}

// Payme to‘lov tizimi
class PaymePayment extends Payment {
  @override
  void processPayment(double amount) {
    print("📲 Payme orqali $amount so‘m to‘landi. Rahmat!");
  }
}

// Visa kartasi orqali to‘lov
class VisaPayment extends Payment {
  @override
  void processPayment(double amount) {
    print("💳 Visa orqali $amount so‘m yechildi. Xizmatdan foydalaning!");
  }
}

// To‘lovni amalga oshirish uchun funksiya
void makePayment(Payment payment, double amount) {
  payment.processPayment(amount);
}

void main() {
  makePayment(ClickPayment(), 100000); // ✅ Click orqali 100000 so‘m muvaffaqiyatli to‘landi.
  makePayment(PaymePayment(), 200000); // 📲 Payme orqali 200000 so‘m to‘landi. Rahmat!
  makePayment(VisaPayment(), 150000); // 💳 Visa orqali 150000 so‘m yechildi. Xizmatdan foydalaning!
}

  flutter:
    sdk: flutter
  web_socket_channel: ^3.0.2

import 'package:web_socket_channel/status.dart' as status;

class WebSocketService {
late WebSocketChannel channel;

/// WebSocket serverga ulanish
void connect() {
channel = WebSocketChannel.connect(
Uri.parse('wss://echo.websocket.org'), // WebSocket server manzili
);
}

/// Xabar jo'natish
void sendMessage(String message) {
if (message.isNotEmpty) {
channel.sink.add(message); // Xabarni serverga yuborish
}
}

/// Serverdan kelayotgan xabarlarni olish
Stream getMessages() {
return channel.stream; // WebSocket stream orqali xabarlarni olish
}

    // Xabarlarni tinglash
    channel.stream.listen((message) {
      print("Yangi xabar: $message");
    }, onError: (error) {
      print("Xatolik: $error"); // Xatoliklarni boshqarish
    }, onDone: () {
      print("Ulanish yopildi");
    });
  }

/// WebSocket ulanishini yopish
void disconnect() {
channel.sink.close(status.goingAway); // Ulanishni yopish
}
}