Scala example source code file (TestFlatMap.scala)

This example Scala source code file (TestFlatMap.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

array, array, compositethrowable, int, int, m, n, pmhashset, pmhashset, range, range, test

The Scala TestFlatMap.scala source code

import scala.collection.parallel.{ ParMap => PMap }
import scala.collection.parallel.mutable.{ ParHashSet => PMHashSet, ParHashMap => PMHashMap, ParArray }
import scala.util.Random
import scala.collection.parallel.CompositeThrowable

object Test {
  
  def main(args: Array[String]) {
    val N = 1500
    val M = 1500
    var unmatchedLeft = new PMHashSet[Int]
    var unmatchedRight = new PMHashSet[Int]
    Range(0, N).foreach{ x => unmatchedLeft += x}
    Range(0, M).foreach{ x => unmatchedRight += x}
    
    try {
      val matches = unmatchedLeft.flatMap{ lind: Int =>
        val dists = unmatchedRight.seq.map{ rind: Int =>
          val dist = Random.nextInt
          (rind, dist)
        }
        dists
      }
    } catch {
      case c: CompositeThrowable => for (t <- c.throwables) println("\n%s\n%s".format(t, t.getStackTrace.mkString("\n")))
    }
  }
  
}