How to use the join function from socket.io

index.js

GitHub: Ankur2491/usualDrawingGameAPI

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    users.push(socket.username);
});
socket.on('new_room', (data, callback) => {
    callback(true);
    socket.roomnum = data;
    socket.join("room-" + socket.roomnum);
    userrooms[data] = [];
    userrooms[data].push(socket.id);
    // console.log(userrooms);
    let hostData = { socketName: socket.username, "userRoom": userrooms }

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+ 5 other calls in file