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Antol
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Feb 24, 2022
| // Вернуть словарь в котором названия городов являются ключами, а значениями - сет клиентов, проживающих в этом городе | ||
| fun Shop.groupCustomersByCity(): Map<String, Set<Customer>> = mapOf() | ||
| fun Shop.groupCustomersByCity(): Map<String, Set<Customer>> = buildMap { | ||
| customers.map { it.city.title }.forEach { put(it, customers.filter { cust -> cust.city.title == it}.toSet()) } |
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Сложна!) Вот так можно customers.groupBy { it.city.title }.mapValues { it.value.toSet() }
| // Вернуть сет клиентов, у которых не доставленных заказов больше чем заказанных | ||
| fun Shop.getCustomersWithMoreUndeliveredOrdersThanDelivered(): Set<Customer> = setOf() | ||
| fun Shop.getCustomersWithMoreUndeliveredOrdersThanDelivered(): Set<Customer> = customers.filter { (it.orders.count { order -> order.isDelivered } | ||
| < it.orders.count { order -> !order.isDelivered})}.toSet() |
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Можно через val (del, undel) = it.orders.partition { it.isDelivered }
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