Interesting little experiment... I have seen many assume that "classes" in node.js is slow... This experiment show that the difference between a module which exports multiple functions vs a module that exports a single class, is almost non-existent! If anything, it shows that we shouldn't be afraid to create new instances of "classes"! That was …

classes-vs-functions.js

var ModClassed = require('./mod-classed');
var modClean = require('./mod-clean');

var modClassed = new ModClassed();

var multiFactor = 10000;


// Doing classed stuff
console.time('classed');
for(var i1=0 ; i1 < multiFactor ; i1++) {
  var number1 = modClassed.addTimesMany(10, 10, multiFactor);
  number1 = modClassed.multiplyTimesMany(number1, 10, multiFactor);
}
console.timeEnd('classed');


// Doing classed stuff with new
console.time('classed new');
for(var i2=0 ; i2 < multiFactor ; i2++) {
  var modClassed2 = new ModClassed();
  var number2 = modClassed2.addTimesMany(10, 10, multiFactor);
  number2 = modClassed2.multiplyTimesMany(number2, 10, multiFactor);
}
console.timeEnd('classed new');


// Doing clean stuff
console.time('clean');
for(var i3=0 ; i3 < multiFactor ; i3++) {
  var number3 = modClean.addTimesMany(10, 10, multiFactor);
  number3 = modClean.multiplyTimesMany(number3, 10, multiFactor);
}
console.timeEnd('clean');

mod-classed.js

var modClassed = function() {};
module.exports = modClassed;

modClassed.prototype.addTimesMany = function(startNumber, addWhat, howMany) {
  startNumber = parseInt(startNumber);
  for(var i=0; i < howMany ; i++) {
    startNumber += parseInt(addWhat);
  }
  return startNumber;
};

modClassed.prototype.multiplyTimesMany = function(startNumber, addWhat, howMany) {
  startNumber = parseInt(startNumber);
  for(var i=0; i < howMany ; i++) {
    startNumber = (startNumber * parseInt(addWhat));
  }
  return startNumber;
};

mode-clean.js

exports.addTimesMany = function(startNumber, addWhat, howMany) {
  startNumber = parseInt(startNumber);
  for(var i=0; i < howMany ; i++) {
    startNumber += parseInt(addWhat);
  }
  return startNumber;
};

exports.multiplyTimesMany = function(startNumber, addWhat, howMany) {
  startNumber = parseInt(startNumber);
  for(var i=0; i < howMany ; i++) {
    startNumber = (startNumber * parseInt(addWhat));
  }
  return startNumber;
};