docs: def customFilter(self, filterFunc):
          '''
              customFilter - Apply a custom filter to elements and return a QueryableList of matches
  
              @param filterFunc <lambda/function< - A lambda/function that is passed an item, and
                 returns True if the item matches (will be returned), otherwise False.
  
              @return - A QueryableList object of the same type, with only the matching objects returned.
          '''
          ret = self.__class__()
          for item in self:
              if filterFunc(item):
                  ret.append(item)
  
          return ret