Scala example source code file (t3242.scala)

This example Scala source code file (t3242.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

a, a, array, benchmarka, exception, int, int, m, m, ok, test, unit, vector, vector

The Scala t3242.scala source code

object Test {

 def benchmarkA(num: Int) {

   type A = Int

   def updateM[M[_]](ms: M[A], update: (M[A], A)=>M[A]): M[A] = {
     var is = ms
     for (i <- 0 until num) is = update(is, i)
     is
   }

   //
   def vectorAppend: Vector[A] = updateM[Vector](Vector(), (as, a)=>{
     val v = (as :+ a)
     //println("==>append:    i: "+i1+", v: "+v)
     v
   })
   // this will crash, Vector bug!
   def vectorRemove(vec: Vector[A]): Vector[A] = updateM[Vector](vec, (as, a)=>{
     val v = (as filterNot{ _ == a})
     //val v = (is filter{ _ != i})
     //println("==>remove:    i: "+a)
     v
   })

   val ct = vectorAppend
   println(" append [num: "+num+"] vec")
   vectorRemove(ct)
   println(" remove [num: "+num+"] vec")
 } // BenchmarkA

 def comparison(num: Int): Unit = {
   for (i <- 1 until 5) benchmarkA(num*i)
   println(">> comparison done, num: "+num);
 }

 def main(args: Array[String]): Unit = {
   try {
     //createBenchmarkA(23).testRun

     comparison(200) // OK
     comparison(2000) // this will crach

   } catch {
     case e: Exception => e.printStackTrace()
   }
 }
}