Category: Examples

This example fetches data from a mock API using asynchronous programming.

import 'dart:async';

class User {
  final String name;
  final String email;

  User(this.name, this.email);

  @override
  String toString() => 'Name: $name, Email: $email';
}

Future<List<User>> fetchUsers() async {
  // Simulating network delay
  await Future.delayed(Duration(seconds: 2));

  return [
User('Alice', '[email protected]'),
User('Bob', '[email protected]'),
User('Charlie', '[email protected]'),
  ];
}

void main() async {
  print('Fetching users...');
  List<User> users = await fetchUsers();

  print('Users fetched:');
  for (var user in users) {
print(user);
  }
}

This example demonstrates a simple inventory management system.

class Product {
  String name;
  double price;
  int quantity;

  Product(this.name, this.price, this.quantity);

  double get totalValue => price * quantity;

  void restock(int amount) {
quantity += amount;
print('$amount units added to $name. New quantity: $quantity');
  }

  @override
  String toString() {
return '$name: \$${price.toStringAsFixed(2)} (Quantity: $quantity)';
  }
}

class Inventory {
  List<Product> products = [];

  void addProduct(Product product) {
products.add(product);
print('Added: $product');
  }

  void displayInventory() {
for (var product in products) {
  print(product);
}
  }

  double get totalInventoryValue {
return products.fold(0, (total, product) => total + product.totalValue);
  }
}

void main() {
  var inventory = Inventory();

  var apple = Product('Apple', 0.5, 100);
  var banana = Product('Banana', 0.3, 150);
  var orange = Product('Orange', 0.8, 200);

  inventory.addProduct(apple);
  inventory.addProduct(banana);
  inventory.addProduct(orange);

  inventory.displayInventory();
  print('Total Inventory Value: \$${inventory.totalInventoryValue.toStringAsFixed(2)}');

  apple.restock(50);
  inventory.displayInventory();
}