Example of a 50/50 distribution for an A/B test based on randomly generated UUIDs

uuid_ab_distribution.kt

import java.util.*
import kotlin.math.abs

fun main() {
    var a = 0
    var b = 0
    for (i in 1..1000) {
        val id = UUID.randomUUID().toString()
        when (abs(id.hashCode() % 2)) {
            0 -> a++
            1 -> b++
            else -> error("not reachable")
        }
    }
    println("$a, $b")
}