Notes

Ejercicio 3, apartado 1:
El valor final debería ser 10, que realmente ha sido el que ha salido. No han aparecido condiciones de carrera porque nodejs no llega a ejecutar realmente a la vez los clientes en un paralelismo real.

apartado 2:
Que counter se verá como un String, por lo que se irá añadiendo "1"s en forma de strings, no como valor numérico

apartado 3:
function() { //'connect' listener

console.log('Conecting... ' + process.argv[2]);

console.log('client connected');
// This is sent to the server.
client.write('1');
});


Ejercicio 4:
var fs = require('fs');
var http = require('http');
var path= require('path');

http.createServer(function (request, response) {

// response is a ServerResponse.
// Its writeHead() method sets the response header.

response.writeHead(200, {'Content-Type': 'text/plain'});

// The end() method is needed to communicate that both the header
// and body of the response have already been sent. As a result, the response can
// be considered complete. Its optional argument may be used for including the last
// part of the body section.
fs.readFile(path.join(__dirname, request.url) , function(err,data){
if (!err){
console.log('Correct path --> '+path.join(__dirname, request.url));
response.writeHead(200, {"Content-Type": "text/html"});
response.write(data);
response.end();
}else{
response.writeHead(404);
response.end('Bad path --> '+path.join(__dirname, request.url));
}
});
//response.end('Hello Worldn');

// listen() is used in an http.Server in order to start listening for
// new connections. It sets the port and (optionally) the IP address.
}).listen(1337, "127.0.0.1");

console.log('Server running at http://127.0.0.1:1337/');