Scala toArray function returning

Question

I am trying to fetch the nbr from a string given. I have used regex object. But Its giving me address value. Please explain why toArray is not giving the result.

ackage Phase1Training
object ScalaRegex {
  def main(args: Array[String]): Unit = {
        val numPattern = "[0-9]+".r
        val address ="123 washington Road 102"
        var zip = numPattern.findFirstIn(address)

        println(zip)
        **var matches = numPattern.findAllMatchIn(address).toArray** //Why this is giving the object address.
        println (matches)
        matches.foreach(println)  //This is perfectly working.

Some(123) [Lscala.util.matching.Regex$Match;@30097f5f 123 102

Ben Reich · Accepted Answer · 2014-11-30 22:48:21Z

2

You are using println on an Array. The println method on many object is not meant to be displayed, and is basically unimplemented. Try mkString on collections, which accepts an optional string delimiter:

myArray.mkString // e.g. "el1el2el3"
myArray.mkString(",") // e.g. "el1,el2,el2"

And then print that.

answered Nov 30, 2014 at 22:48

Ben Reich

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1 Comment

om-nom-nom Over a year ago

It is implemented in some sense, it's just that default implementation that comes from the very top of class hierarchy (Object) is not what you would expect to see normally

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