Scala won't let me sort string array

Question

I have defined the following object which I want to sort a string concurrently.

object QuoteFuture extends App {

  val wordsStr : String = "Lorem ipsum dolor ..."

  import scala.concurrent._
  import ExecutionContext.Implicits.global

  val f : Future[String] = Future {
    val wordsArr = wordsStr.split("\\s+")
    wordsArr.sorted // <<<<< Compiler error from here (line 15)
  }
  f.onComplete(t => {
    if (t.isSuccess) {
      println(s"words sorted: ${t.get}")
    } else {
      println("could not sort words")
    }
  })
}

I have omitted the entire string for brevity. When I attempt to run the code above, I get the following compilation error:

Error:(15, 14) polymorphic expression cannot be instantiated to expected type;
 found   : [B >: String]Array[String]
 required: String
    wordsArr.sorted

I have no idea what this means.

Dan Simon · Accepted Answer · 2017-10-30 17:30:54Z

4

You've declared your future f to be of type String, but wordsArr.sorted is going to be an Array[String], so you should declare it as

val f : Future[Array[String]] = //...

answered Oct 30, 2017 at 17:30

Dan Simon

13.2k3 gold badges52 silver badges55 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Scala won't let me sort string array

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related