Answered by : agreeable-addax-x2fqmigqlh8g

val emptyHashSet: HashSet[String] = HashSet.empty[String]
emptyHashSet += "item"

Source : http://allaboutscala.com/tutorials/chapter-7-beginner-tutorial-using-scala-mutable-collection/scala-tutorial-learn-use-mutable-hashset/ | Last Update : Mon, 16 Mar 20