I have a challange. Check out following code: ``` ...

# announcements

[marcinmoskala]

I have a challange. Check out following code:

data class User(val id: Int, val paid: Boolean, val activityPoints: Int)

fun main(args: Array<String>) {
    val users = (1..1_000_000).map { User(it, it % 3 != 1, it % 100) }
    val superusers = (1..100).flatMap { users }

    println(measureTimeMillis {
        superusers.filter { it.paid }
    }) // 2514

    println(measureTimeMillis {
        superusers.filter { it.paid }
    }) // 3367

    println(measureTimeMillis {
        superusers.filter { it.paid }
    }) // 2056

    println(measureTimeMillis {
        superusers.filter { it.paid }
    }) // 1183

    println(measureTimeMillis {
        superusers.filter { it.paid }
    }) // 1942
}

This times varies, but on my machine comparison is always the same: Second time is the longest, fourth it shortest.