In Scala, how would you declare static data inside a function?

Question

In many situations I find that I need to create long-living values inside a function\'s scope, and there is no need for this data to be at class/object scope.

For ex

Answer 1

Extending FunctionXX is another way of achieving the goal; it might have an advantage of providing better documentation. Both parameter types and return value type are visible on the first line of the declaration:

val activeUser = new Function0[List[String]] {
  val users = getUsersFromDB
  def apply = users filter (_.active)
}