Limit songs per DJ

var songsLimit = 4;
var djs = {};

bot.on('roomChanged', function (data) {
  var currentDjs = data.room.metadata.djs;
  for (var i = 0; i < currentDjs.length; i++) {
    djs[currentDjs[i]] = { nbSong: 0 };
  }
});

bot.on('add_dj', function (data) {
  djs[data.user[0].userid] = { nbSong: 0 };
});

bot.on('rem_dj', function (data) {
  delete djs[data.user[0].userid];
});

bot.on('endsong', function (data) {
  var djId = data.room.metadata.current_dj;
  if (djs[djId] && ++djs[djId].nbSong >= songsLimit) {
    bot.remDj(djId);
    delete djs[djId];
  }
});