Output from compiling example CoffeeScript source, showing that classes cannot be reopened as in JS and Ruby: they're "just" variables

JavaScript output from compiling CoffeeScript example source (Gist 2 of 2).js

// Generated by CoffeeScript 1.4.0
(function() {
  var A, a;

  A = (function() {

    function A() {
      this.a = 1;
    }

    return A;

  })();

  A = (function() {

    function A() {}

    A.prototype.foo = function() {
      return this.a;
    };

    return A;

  })();

  a = new A();

  a.foo();

}).call(this);