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TatianaBelova
changed the title
TatianaBelova
changed the title
Antol
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Feb 24, 2022
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| // Вернуть список клиентов из представленного города | ||
| fun Shop.getCustomersFrom(city: City): List<Customer> = listOf() | ||
| fun Shop.getCustomersFrom(city: City): List<Customer> = customers.filter { it.city == city }.toList() |
Contributor
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Последний .toList() тебе просто копию результата делает - не нужно тут это
| // 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>> = | ||
| customers.associate { it.city.title to this.getCustomersFrom(it.city).toSet() } |
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Хорошо, только каждый раз еще поиск по всем клиентам. Можно вот так 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 { customer -> | ||
| customer.orders.filter { !it.isDelivered }.count() > customer.orders.filter { it.isDelivered }.count() }.toSet() |
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{ !it.isDelivered } - можно в count передавать, тогда фильтр не нужен будет
| // Вернуть наиболее дорогой продукт из всех доставленных | ||
| fun Customer.getMostExpensiveDeliveredProduct(): Product? = null | ||
| fun Customer.getMostExpensiveDeliveredProduct(): Product? = | ||
| orders.filter { order -> order.isDelivered }.flatMap { it.products }.sortedBy { it.price }.reversed().firstOrNull() |
Contributor
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Накрутила в конце) Можно было просто maxByOrNull { it.price }
| // Вернуть число - сколько раз был заказан выбранный продукт | ||
| fun Shop.getNumberOfTimesProductWasOrdered(product: Product): Int = 0 No newline at end of file | ||
| fun Shop.getNumberOfTimesProductWasOrdered(product: Product): Int = | ||
| customers.flatMap { it.orders }.flatMap { it.products }.filter { it == product }.count() |
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Тоже просто .count { it == product } в конце
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