code: def get_active() -> List[str]:
          
          active = []
          for i in range(__num_subarrays__):
              key = Subarray.get_key(i)
              if DB.get_hash_value(key, 'active').upper() == 'TRUE':
                  active.append(Subarray.get_id(i))
          return active
docs: Return the list of active subarrays.