gistfile1.txt

//Problem: area is not defined

var mapmove = io
  .of('/mapmove')
  .on('connection', function (socket) {
	var area = 0;
	socket.on('areachange', function(data) {
		area = removeSocketFromArea.call(this, data);
	});
  });


function removeSocketFromArea(area) {
	//remove socket from old area
	if (area != 0) {
		...
	}
}