randombypercent.kt

import java.util.Random;

fun pickRandomPercentage(counts: Array<Pair<Int, Int>>): Int {
    val total = counts.sumBy { src -> src.second }
    
    println("Total: ${total}")
    var random = Random().nextInt(total) + 1 // Random inclusive between 1 and total
    
    for ((value, count) in counts) {
        println("Random: ${random} Value: ${value} Count ${count}")
        if (random <= count) {
            return value;
        }
        random = random - count;
    }
    return -1
}

fun main(args: Array<String>) {
    // Create array of pairs, [{1: 5}, {2: 10}, {3: 20}, {4: 2}]
    val counts = arrayOf((1 to 5), (2 to 10), (3 to 20), (4 to 2))
    println("Random Value Pick: ${pickRandomPercentage(counts)}!")
}