Here is a Scala implementation of the above algorithm. It illustrates that you can use a stepper variable and an if within a for loop. However, there is something missing. What method call should go in the place marked ????

def numberOfOpenItems =
  var openCount = 0
  for current <- this.items do
    if ??? then
      openCount += 1
  openCount

A simple call that invokes a method on an EnglishAuction object will do. Please enter that method call in the field below.