Scala example source code file (t3502.scala)

This example Scala source code file (t3502.scala) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Scala tags/keywords

generateprimefactorslazy, generateprimefactorslazy, int, int, list, list, test, test

The Scala t3502.scala source code

// ticket #3502
object Test {
  
  object GeneratePrimeFactorsLazy extends (Int => List[Int]) {
    override def apply(n:Int) = {
      val s = Stream.range(2, n / 2).filter(n % _ == 0)
      //val s = for (i <- Stream.range(2, n / 2); if n % i == 0) yield i
      s.headOption.map(x => x :: apply(n / x)).getOrElse(List(n))
    }
  }
  
  def main(args:Array[String]) {
    // a prime number
    //val num = 623456789
    val num = 2796203
    assert(GeneratePrimeFactorsLazy(num) == List(num))
  }
  
}