public static void AddTodoItem(this TodoListState todoList, int itemNumber, string itemText)
{
if (todoList.Items.ContainsKey(itemNumber))
{
throw new ArgumentException("This list already has an item with that number");
}
todoList.Apply(new TodoItemAdded(todoList.Id, itemText, itemNumber));
}
public static void UncheckTodoItem(this TodoListState todoList, int itemNumber)
{
todoList.Apply(new TodoItemUnchecked(todoList.Id, itemNumber));
}
public static void NameTodoList(this TodoListState todoList, string name)
{
todoList.Apply(new TodoListNamed(todoList.Id, name));
}
