Список карт Kotlin
val numbers = setOf(1, 2, 3)
println(numbers.map { it * 3 }) // [3, 6, 9]
Ceadeus
val numbers = setOf(1, 2, 3)
println(numbers.map { it * 3 }) // [3, 6, 9]fun main() {
val numbers = listOf("one", "two", "three", "four")
println(numbers.associateBy { it.first().toUpperCase() })
println(numbers.associateBy(keySelector = { it.first().toUpperCase() }, valueTransform = { it.length }))
}