def <<(*list)
        if list.count > 0
          notify_will_change!
          list.flatten.each { |e| collection.push(e) }
        end
      end
def <<(*list)
        if list.count > 0
          notify_will_change!
          list.flatten.each { |e| collection.push(e) }
        end
      end
def << ( * list ) if list . count > 0 notify_will_change! list . flatten . each { | e | collection . push ( e ) } end end
Append items to the collection
Append items to the collection