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app.get('/users/:userId', (req, res) => {
  res.send(req.params);
})

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app.get('/', (req, res) => {
  res.send('Hello World!');
});

app.post('/', (req, res) => {
  res.send('Got a POST request');
});

app.put('/user', (req, res) => {
  res.send('Got a PUT request at /user');

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const express = require('express');
const app = express();

app.get('/', (req, res) => {
  res.send('Hello World!');
});

app.listen(3000, () => {
  console.log('Example app listening on port 3000!');
});

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// metodo async
function strictAddition(x, y, callback) {
  if (typeof x !== 'number') {
    return callback( new Error('First argument is not a number') );
  }

  if (typeof y !== 'number') {
    return callback( new Error('Second argument is not a number') );
  }

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const fs = require('fs');

fs.readFile('test.txt', (err, data) => {
   if (err) {
      return console.error(err);
   }
   console.log('Async read: ' + data.toString());
});

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const fs = require('fs');

fs.writeFile('test.txt', "Testing...", (err) => {
    if (err) {
        return console.log(err);
    }
    console.log('File saved.');
}); 

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const EventEmitter = require('events').EventEmitter;

class MyEmitter extends EventEmitter {
  constructor(){
    super();
    let count = 5;

    let timer = setInterval(() => {
      this.emit('hi', 'Hello Server!');
      count--;

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// cargar modulo http
const http = require('http');

// crear un web server que responde "Hello Server" a todos los requests.
const server = http.createServer(function (req, res) {
  res.writeHead(200, {'Content-Type': 'text/plain'});
  res.end('Hello Server!');
});

// attachar el servidor al puerto 8000

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const events = []

while (events) {
    const e = events[0]; // obtener primer elemento de la cola
    if (e.callback) { // si tiene una funcion asociada, ejecutarla
      callback();
    }
}

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// blocking
const fs = require('fs');
const data = fs.readFileSync('/file.md'); // blocks here until file is read
console.log(data);

moreWork();

// non-blocking
const fs = require('fs');
fs.readFile('/file.md', (err, data) => {