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KotlinFunctionalExample.kt

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package ch03

import kotlin.math.roundToLong

data class Member(var name: String, var age: Int)

fun main() {

val members: MutableList<Member> = ArrayList()

members.add(Member("카리나", 24))

members.add(Member("윈터", 23))

members.add(Member("지젤", 24))

members.add(Member("닝닝", 22))

val chosenMembers = members

.filter { it.age == 24 }

.map { it.name }

.sorted()

println(chosenMembers)

// ---

val numbers1: List<Double> = mutableListOf(49.1, 25.5, 9.9)

numbers1

.map(Math::round)

.forEach(System.out::println)

// ---

val numbers2: List<Double> = mutableListOf(49.1, 25.5, 9.9)

numbers2

.map { it.roundToLong() }

.forEach { println(it) }

}