Kotlin Koans 25 Sort

#kotlin #kotlin-koans
目次

Sort (Playground)

Description

Implement Shop.getCustomersSortedByNumberOfOrders() using sorted or sortedBy.

sorted もしくは sortedBy を使用して、Shop.getCustomersSortedByNumberOfOrders() を実装してください。

listOf("bbb", "a", "cc").sorted() == listOf("a", "bbb", "cc")
listOf("bbb", "a", "cc").sortedBy { it.length } == listOf("a", "cc", "bbb")

Code 

// Return a list of customers, sorted by the ascending number of orders they made
fun Shop.getCustomersSortedByNumberOfOrders(): List<Customer> = customers.sortedBy { it.orders.size }

Memo

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