chat.js

var net = require('net');
var carrier = require('carrier');

var connections = [];

net.createServer(function(conn) {
	connections.push(conn);
	
	conn.write("Hello, welcome to this chat server!\n");
	conn.write("Please input your user name: \n");
	
	conn.on('close', function() {
		var pos = connections.indexOf(conn);
		if(pos >= 0) {
			connections.splice(pos, 1);
		}
	});
	
	
	var username;

	carrier.carry(conn, function(line) {
		if(!username) {
			username = line;
			conn.write("Hello " + username + "!\n");
			return;
		}
		
		if(line == 'quit') {
			conn.end();
			return;
		}
		
		var feedback = username + ": " + line + "\n";

		connections.forEach(function(one_connection) {
			one_connection.write(feedback);
		})
	});
	conn.on('data', function(data) {
		
	});
}).listen(4000);