chat.js

const net  =  require('net')

const tcp  = net.createServer()

tcp.maxConnections  =  2

const notTheSame = (sender, receiver) => sender !== receiver

const messageOthers =  (sockets,sender,callback)=>{
  sockets.forEach((receiver,i)=>{
    if(notTheSame(sender, receiver)){
      callback(receiver)
    }})
}

const prettify =  (sockets,sender, message)=>{
  sender.on("data", (data)=>{
      messageOthers(sockets,sender, (receiver)=>{
        message(receiver, data)
      })
    })
}

const chat  = (sender)=>{
  sender.setEncoding('utf8')
  sockets.push(sender)
  prettify(sockets, sender, (receiver, data)=>{
    receiver.write(`${data}`)
  })
}

const sockets  =  []
tcp.on("connection", chat)
tcp.listen(3000, ()=>console.log("Listening on port 3000"))