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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() | ||
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| @OptIn(ExperimentalStdlibApi::class) |
| fun Shop.groupCustomersByCity(): Map<String, Set<Customer>> = mapOf() | ||
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| @OptIn(ExperimentalStdlibApi::class) | ||
| fun Shop.groupCustomersByCity(): Map<String, Set<Customer>> = buildMap <String, Set<Customer>> { |
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Можно проще customers.groupBy { it.city.title }.mapValues { it.value.toSet() }
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