ДЗ по коллекциям - Трошин #5
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Antol
approved these changes
Feb 24, 2022
| @@ -1,3 +1,5 @@ | |||
| package com.example.hw2 | |||
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| // Вернуть сет городов в которых проживают клиенты | ||
| fun Shop.getCitiesCustomersAreFrom(): Set<City> = setOf() | ||
| fun Shop.getCitiesCustomersAreFrom(): Set<City> { |
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В общем правильно и так, но можно писать в одну строку, если функция маленькая
fun Shop.getCitiesCustomersAreFrom(): Set<City> = customers.map({it.city}).toSet()
| fun Shop.getCustomersWithMoreUndeliveredOrdersThanDelivered(): Set<Customer> = setOf() | ||
| fun Shop.getCustomersWithMoreUndeliveredOrdersThanDelivered(): Set<Customer> { | ||
| return customers.filter { it -> | ||
| it.orders.count { it.isDelivered } < it.orders.count { !it.isDelivered } |
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Отлично. Как альтернатива еще partition
| fun Customer.getMostExpensiveDeliveredProduct(): Product? { | ||
| return orders.filter { it.isDelivered }.flatMap { it -> | ||
| it.products.sortedBy { it.price } | ||
| }.lastOrNull() |
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Ошибка . У тебя сортируются продукты перед добавлением в общую коллекцию.
Если будет ситуация например такая (оба заказа доставлены):
[
order {
product(100),
product(10),
},
order {
product(10),
product(1),
}
]
То в твоем случае наибольшая цена будет 10, а не 100 как должно быть
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