I want the output of my first code to add 42 in each number from 1 to 100 and in second code I want it to change any lowercase in name to upper case but the first only prints number from 1 to 100 and second only first letter upper case as it was.
import scala.collection.parallel.CollectionConverters._
object parallelpro1 extends App{
val list = (1 to 100).toList
list.par.map(_ 42)
println(list)
// map
val lastNames = List("Smith","Jones","Frankenstein","Bach","Jackson","Rodin").par
lastNames.map(_.toUpperCase())
println(lastNames)
}
CodePudding user response:
you need to understand that scala collections like List are immutable, list.par.map(_ 42)
does not change the list
but creates a new one, you need to assign it to a new val, the same applies to lastNames.map(_.toUpperCase())
.