generate a random loto play / published by https://github.com/dacr/code-examples-manager #ff0c5b51-591f-4fd1-b97d-b619d6c5d2c1/a76ed5261fa7ef773df5daedbbbd04e78f448297

loto-random-generator.sc

// summary : generate a random loto play
// keywords : scala, loto, 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 : ff0c5b51-591f-4fd1-b97d-b619d6c5d2c1
// created-on : 2021-02-10T21:45:49Z
// managed-by : https://github.com/dacr/code-examples-manager
// run-with : scala-cli $file

// ---------------------
//> using scala  "3.2.2"
// ---------------------

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(49,5).mkString(" - "))
println("stars : " + select(10,1).mkString(" - "))