Essential Kotlin

Different Kinds of Streams 4 - iterate an array map the values calculate the average

suggest change 
// Java:
Arrays.stream(new int[] {1, 2, 3})
    .map(n -> 2 * n + 1)
    .average()
    .ifPresent(System.out::println); // 5.0
// Kotlin:
arrayOf(1,2,3).map { 2 * it + 1}.average().apply(::println)
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