Javascript Zugriff auf Elemente des Arrays funktioniert nicht

var net = require('net');

var dgram = require('dgram');

function ClientList () {

    this.list = [];

  this.add = function (addr, port) {

    var obj = {

      addr: addr,

      port: port

    };  

    this.list.push(obj);    

  };

  this.find = function (addr, port) {

    for (i = 0; i < this.list.length; i++) {

      if(this.list[i].addr = addr && this.list[i].port == port)

        return true;

    }

    return false;

  };

}

var clients =  new ClientList();

var server = dgram.createSocket('udp4');

server.on('listening', function () {

    var address = server.address();

    console.log('UDP Server listening on ' + address.address + ":" + address.port);

});

server.on('message', function (message, remote) {

  if(clients.find(remote.address, remote.port) == false)

  {      

    console.log("new client at " + remote.address + ':' + remote.port );

    clients.add(remote.address, remote.port);

    console.log(clients.list);    

  }

});

server.bind(7772, '255.255.255.255');