Node js - Chat Server (NSFW)

startserver.js

Array.prototype.has = function(value) {
	var i;
	for (var i = 0, loopCnt = this.length; i < loopCnt; i++) {
		if (this == value) {
			return true;
		}
	}
return false;
};

var net = require('net');
var sockets = [];
var nicks = [];
var joined = undefined;
var server = net.createServer(function(socket) {
	sockets.push(socket);
	socket.on('data', function(data) {
		var j = sockets.indexOf(socket);
		if(nicks[j] == undefined){
			var temp = data.toString().replace(/[\n\r\t]/, '');
			var temp = temp.replace(/^\s*|\s*$/g,'');
			if ((temp != '') && (nicks.has(temp) == false)){
				nicks[j] = data.toString().replace(/[\n\r\t]/, '');
				joined = true;
			} else {
				socket.end('Nick invalid!');
				joined = undefined;
			}
		} else { joined = undefined; }
		for (var i = 0; i < sockets.length; i++) {
		if (sockets[i] == socket) continue;
			if (joined != undefined){
				sockets[i].write(nicks[j] + " joined the server!\r\n");
			} else {
				if (nicks[j] != undefined){
					sockets[i].write(nicks[j] + ": " + data);
				}
			}
		}
	});
	socket.on('close', function(exp) {
		var i = sockets.indexOf(socket);
		sockets.splice(i, 1);
		nicks.splice(i, 1);
	});
	socket.on('error', function(exp) {
		var i = sockets.indexOf(socket);
		sockets.splice(i, 1);
		nicks.splice(i, 1);
	});
});

server.listen(8001);