Private members don't really work in CoffeeScript

gistfile1.js

// This is an example in a post about private members in CoffeeScript.
// Read more: http://evanhahn.com/?p=1126

var Animal, birch, jambo;

Animal = (function() {
  var firstName;

  firstName = "";

  function Animal(n) {
    firstName = n;
  }

  Animal.prototype.getFirstName = function() {
    return firstName;
  };

  return Animal;

})();

jambo = new Animal("Jambo");

console.log(jambo.getFirstName());

birch = new Animal("Birch");

console.log(birch.getFirstName());

console.log(jambo.getFirstName());

// This is the output of the following:

/*

class Animal
  firstName = ""  # Private member
  constructor: (n) ->
    firstName = n
  getFirstName: ->
    firstName

jambo = new Animal "Jambo"
console.log jambo.getFirstName()  # => "Jambo"

birch = new Animal "Birch"
console.log birch.getFirstName()  # => "Birch"

console.log jambo.getFirstName()  # => "Birch"  # Not what we want!!

*/

// This code by Evan Hahn (evanhahn.com) is licensed under the Unlicense.
// http://unlicense.org/