generate a random euromillions play / published by https://github.com/dacr/code-examples-manager #182068a4-970a-4ca0-bccb-f41fa2d44d31/d2fa31adeffb2fc8bbf94a7e2f6c2003db7dd0a0

euromillions-random-generator.sc

// summary : generate a random euromillions play
// keywords : scala, euromillions, random, rng, fdj, @testable
// publish : gist
// authors : David Crosson
// license : Apache NON-AI License Version 2.0 (https://raw.githubusercontent.com/non-ai-licenses/non-ai-licenses/main/NON-AI-APACHE2)
// id : 182068a4-970a-4ca0-bccb-f41fa2d44d31
// created-on : 2021-02-10T21:45:49Z
// managed-by : https://github.com/dacr/code-examples-manager
// run-with : scala-cli $file

// ---------------------
//> using scala "3.4.2"
// ---------------------

def gen(limit:Int):Int = scala.util.Random.nextInt(limit)+1

def select(limit:Int,count:Int):List[Int]= {
  LazyList
    .continually(gen(limit))
    .scanLeft(Set.empty[Int]) ( (selected, randomlyChosen) => selected+randomlyChosen)
    .find(_.size == count)
    .get
    .toList
    .sorted
}

println("nums  : " + select(50,5).mkString(" - "))
println("stars : " + select(12,2).mkString(" - "))