kotlin val numbers = listOf(1, 2, 3, 4, 5) val squares = numbers.map { number -> number * number } kotlin val numbers = listOf(1, 2, 3, 4, 5) val evenNumbers = numbers.filter { number -> number % 2 == 0 } kotlin val numbers = listOf(1, 2, 3, 4, 5) val sum = numbers.stream() .filter { number -> number % 2 == 0 } .mapToInt { number -> number } .sum() groovy dependencies { implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version" }