Node.js Script from Talk

gistfile1.js

var http = require('http');
var Q = require('q');

var IntensiveFunctions = (function(){

  var self = {};

  self.randomWalk = function(i){
    return Q.fcall(function(){
      var total = 0;
      for(; i > 0; i--){
        if(Math.random() > 0.5) total += 1;
        else total += -1;
      }
      return total;
    });
  };

  return self;

})();


http.createServer(function(req, res){

  var promise1 = IntensiveFunctions.randomWalk(1000000000);
  var promise2 = IntensiveFunctions.randomWalk(1000000000);

  Q.spread([promise1, promise2], function(num1, num2){
    res.writeHead(200, {'Content-Type':'text/plain'});
    res.end((num1 + num2) + "\n");
  });
  

}).listen(1337, '127.0.0.1');