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generate a random loto play / published by https://github.com/dacr/code-examples-manager #ff0c5b51-591f-4fd1-b97d-b619d6c5d2c1/458847d695d03a28aa2c206c64f82b302fe502cc
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| // summary : generate a random loto play | |
| // keywords : scala, loto, random, rng, fdj, @testable | |
| // publish : gist | |
| // authors : David Crosson | |
| // license : Apache License Version 2.0 (https://www.apache.org/licenses/LICENSE-2.0.txt) | |
| // 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 "3.4.2" | |
| // --------------------- | |
| 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(49,5).mkString(" - ")) | |
| println("stars : " + select(10,1).mkString(" - ")) |
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