javascript - Socket.io how to get room id -

i have problem, want only room id

i know io.sockets.manager.rooms returns object :/

in code (i send list of rooms client , checks id)

io.sockets.on('connection', function(socket) {     socket.join('main');    socket.emit('start',io.sockets.manager.roomclients[socket.id]);        }); 

and client:

var socket = io.connect('http://localhost:3250');                                     socket.on('start', function(data) {                 panel.innerhtml = data;                 }        

the solution is:

 var keys = function( object ) {   if ( !(object && typeof object === 'object') ) {     return null;   }   var result = [];   (var key in object) {     if (object.hasownproperty(key)) {       result.push(key)     }   }   return result; }     var obiekt = io.sockets.manager.rooms;     socket.emit('rooms', keys(obiekt)) 

i'm not 100% sure need here. want return array of room names? if so, can keys object returned io.sockets.manager.rooms, e.g. using helper function provided underscore:

socket.emit('rooms', _.keys(io.sockets.manager.rooms) ); 

edit: i've used underscore here, can code own keys function, looping through objects properties, this:

var keys = function( object ) {   if ( !(object && typeof object === 'object') ) {     return null;   }   var result = [];   (var key in object) {     if (object.hasownproperty(key)) {       result.push(key)     }   }   return result; } 

note might miss edge cases, idea