comparison.js

// classical
var Foo = function _construct(a) {
  this.a = a;
}

Foo.prototype.lulz = function () {};
Foo.prototype.prop = 42;

// new
var Foo = {
  lulz: function () {},
  prop: 42,
  constructor: function () {
    this.a = a;
  }
}

// init
var f = new Foo;