Array of rooms present on socket.io in v1.0

I have searched for it in stack overflow, but could not get what I wanted certainly. So here my question is: Is it possible to get an array of rooms presently available in socket.io.

I have looked other questions like this in stackoverflow. BUt I am not clear.

when I use io.sockets.adapter.rooms and console log the output, I get:

    { TeMJp5CVxdJlXsDiAAAA: [ TeMJp5CVxdJlXsDiAAAA: true ],
      lobby: [ TeMJp5CVxdJlXsDiAAAA: true ],
      'H-xHQXha_NdOs6sPAAAB': [ 'H-xHQXha_NdOs6sPAAAB': true ],
      room: [ 'H-xHQXha_NdOs6sPAAAB': true ],
     '5LglXlxtn498I9NaAAAC': [] }

It comprises of ids and room names mixed up. I need only array of rooms. Need help