Koltin measureTimeMillis

val numbers: List<Int>
    val timeInMillis = measureTimeMillis {
        numbers = buildList {
            addAll(0..100)
            shuffle()
            sortDescending()
        }
    }
// here numbers are initialized and sorted
println(numbers.first()) // 100

println("(The operation took $timeInMillis ms)")

Source: kotlinlang.org

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