Solution to exercise from Mary's seminar: (we didn't need to be "return"ing all our outputs, just executing them is enough.

gistfile1.txt

var http = require('http');
var fs = require('fs');

var DAY = "day";
var NIGHT = "night";

var server = {
  getFile : function (path, filetype, res) {
    fs.readFile(__dirname + path, 'utf8', function (err, data) {
        res.writeHead(200, { 'Content-Type': filetype });
        res.end(data);
      });
  },
  routes : {
    "/" : function (res) {
      this.getFile('/index.html', 'text/html', res);
    },
    "/client.js" : function (res) {
      this.getFile('/client.js', 'application/javascript', res);
    },
    "/canvas-renderer.js" : function (res) {
      this.getFile('/canvas-renderer.js', 'application/javascript', res);
    },
    "/time.json" : function (res) {
        res.writeHead(200, { 'Content-Type': 'application/json' });
        res.end('{ "time": "' + this.getTimeOfDay(new Date().getHours()) + '" }');
    }
  },
  getTimeOfDay : function (hour) {
    return hour > 6 && hour < 20 ? DAY : NIGHT;
  },
  requestHandler: function (req, res) {
    if (Object.keys(this.routes).indexOf(req.url) !== -1) {
      this.routes[req.url].call(this, res);
    }
    else {
      res.writeHead(404, { 'Content-Type': 'text/plain'});
      res.end('Not found. Apologies!');
    }
  }
};

http.createServer(server.requestHandler).listen(4000);

exports.server = server;