Scala parallel collections

fact_par.sc

#!/usr/bin/env -S scala-cli shebang

//> using scala "3.1.0"
//> using lib "org.scala-lang.modules::scala-parallel-collections:1.0.4"

import scala.collection.parallel.CollectionConverters._

def fact(n: BigInt) =
  (n to 1 by -1).par.product

println(fact(500000))

fact_par.scala

/*
build.sbt:

libraryDependencies +=
  "org.scala-lang.modules" %% "scala-parallel-collections" % "0.2.0"
*/

import scala.collection.parallel.CollectionConverters._

def fact(n: Int): BigInt = (n to 1 by -1).par.product

fact_par_scala3.scala

//> using scala 3.1.0
//> using lib org.scala-lang.modules::scala-parallel-collections:1.0.4

/*
  Para ejecutar con scala-cli (https://scala-cli.virtuslab.org):

  $ scala-cli fact_par.scala

*/

import scala.collection.parallel.CollectionConverters._

def fact(n: BigInt) = (n to 1 by -1).par.product


@main
def main = println(fact(500000))

fact_par_ver2.sc

#!/usr/bin/env -S scala-cli shebang

//> using scala 3.1.0
//> using lib org.scala-lang.modules::scala-parallel-collections:1.0.4

import scala.collection.parallel.immutable.ParSeq

def fact(n: BigInt): BigInt =
  ParSeq.range(BigInt(1), n + 1).product

fact(500000).toString
  .grouped(120)
  .foreach(println)