Taming the Dragon example

index.js

'use strict';

const http = require('http');
const port = 3000;

class Visit {
  constructor(visit_id, headers) {
    this.visit_id = visit_id;
    this.headers = headers;
  }
}

const visits = new Array();

function saveVisitor(headers) {
  visits.push(new Visit(visits.length + 1, headers))
}

function requestHandler(request, response) {
  saveVisitor(request.headers);
  response.end(`Visitor number ${visits.length}\n`);
}

const server = http.createServer(requestHandler);

server.listen(port, (err) => {
  if (err) return console.log('something bad happened', err);
  console.log(`server is listening on ${port}. Our PID is: ${process.pid}`);
});