onlyEvenInt in Kotlin ("Write a function that takes an array of integers as an input, and returns a new array containing only even integers, sorted.")

onlyEvenInt.kt

// Run it at play.kotlinlang.org

fun onlyEvenInt(numbers: List<Int>) = numbers.filter { it % 2 == 0 }.sorted()

fun main() {   
    println(onlyEvenInt(listOf(1, 2, 3, 4, 5, 6, 7)))
    println(onlyEvenInt(listOf(6, 7, 1, 2, 3, 4, 5)))
    println(onlyEvenInt(listOf(1, 3, 5, 7)))
    println(onlyEvenInt(listOf(-2, -3, -4, 0)))
}

Being on JVM, using lists is idiomatic. But could use arrays just as well.

fun onlyEvenInt(numbers: IntArray) = numbers.filter { it % 2 == 0 }.sorted().toIntArray()