Scala for impatients, chapter 4, 2th task

gistfile1.scala

var frequency = new scala.collection.mutable.HashMap[String, Int]

def process( word: String ): Unit = {
  frequency += ( word -> ( frequency.getOrElse( word, 0 ) + 1 ) )
}

var in = new java.util.Scanner( new java.io.File ( "/Users/andriy/tmp/myfile.txt" ) )

while ( in.hasNext ) process ( in.next )

println ( frequency )