Balance sheet object model example to demonstrate CoffeeScript and translated Javascript.

balance_sheet.coffee

# Creative Commons Attribution-Share Alike 3.0 United States License
# http://creativecommons.org/licenses/by-sa/3.0/us/
# By Susan Potter <http://geek.susanpotter.net>
class BalanceSheet
  constructor: (companyName, date) ->
    @companyName: companyName
    @date: date
    @assets: []
    @liabilities: []
  entries: ->
    (@assets + @liabilities)
  assets: ->
    @assets
  liabilities: ->
    @liabilities
  addAsset: (asset) ->
    @assets.push(asset)
  addLiability: (liability) ->
    @liabilities.push(liability)

class Term

class CurrentTerm extends Term
class LongTerm extends Term

class BalanceSheetEntry
  constructor: (type, subtype, term, amount) ->
    @type: type
    @subtype: subtype
    @term: term
    @amount: amount
  amount: ->
    @amount
  type: ->
    @type

class StatedEntry extends BalanceSheetEntry
class AnalyzedEntry extends BalanceSheetEntry

balSheet: new BalanceSheet('XYZ Inc', new Date())
balSheet.addAsset(new StatedEntry('asset', 'cash', CurrentTerm, 700000))
balSheet.addAsset(new StatedEntry('asset', 'receivables', CurrentTerm, 2600000))
balSheet.addAsset(new StatedEntry('asset', 'ppe', LongTerm, 60000000))
balSheet.addLiability(new StatedEntry('liability', 'payables', CurrentTerm, 1500000))
balSheet.addLiability(new StatedEntry('liability', 'mortgage', LongTerm, 10000000))

balance_sheet.js

// Creative Commons Attribution-Share Alike 3.0 United States License
// http://creativecommons.org/licenses/by-sa/3.0/us/
// Generated from CoffeeScript translator of previous CS code.
var AnalyzedEntry, BalanceSheet, BalanceSheetEntry, CurrentTerm, LongTerm, StatedEntry, Term, balSheet;
var __extends = function(child, parent) {
    var ctor = function(){ };
    ctor.prototype = parent.prototype;
    child.__superClass__ = parent.prototype;
    child.prototype = new ctor();
    child.prototype.constructor = child;
  };
BalanceSheet = function BalanceSheet(companyName, date) {
  this.companyName = companyName;
  this.date = date;
  this.assets = [];
  this.liabilities = [];
  return this;
};
BalanceSheet.prototype.entries = function entries() {
  return this.assets + this.liabilities;
};
BalanceSheet.prototype.assets = function assets() {
  return this.assets;
};
BalanceSheet.prototype.liabilities = function liabilities() {
  return this.liabilities;
};
BalanceSheet.prototype.addAsset = function addAsset(asset) {
  return this.assets.push(asset);
};
BalanceSheet.prototype.addLiability = function addLiability(liability) {
  return this.liabilities.push(liability);
};
Term = function Term() {};
CurrentTerm = function CurrentTerm() {
  return Term.apply(this, arguments);
};
__extends(CurrentTerm, Term);
LongTerm = function LongTerm() {
  return Term.apply(this, arguments);
};
__extends(LongTerm, Term);
BalanceSheetEntry = function BalanceSheetEntry(type, subtype, term, amount) {
  this.type = type;
  this.subtype = subtype;
  this.term = term;
  this.amount = amount;
  return this;
};
BalanceSheetEntry.prototype.amount = function amount() {
  return this.amount;
};
BalanceSheetEntry.prototype.type = function type() {
  return this.type;
};
StatedEntry = function StatedEntry() {
  return BalanceSheetEntry.apply(this, arguments);
};
__extends(StatedEntry, BalanceSheetEntry);
AnalyzedEntry = function AnalyzedEntry() {
  return BalanceSheetEntry.apply(this, arguments);
};
__extends(AnalyzedEntry, BalanceSheetEntry);
balSheet = new BalanceSheet('XYZ Inc', new Date());
balSheet.addAsset(new StatedEntry('asset', 'cash', CurrentTerm, 700000));
balSheet.addAsset(new StatedEntry('asset', 'receivables', CurrentTerm, 2600000));
balSheet.addAsset(new StatedEntry('asset', 'ppe', LongTerm, 60000000));
balSheet.addLiability(new StatedEntry('liability', 'payables', CurrentTerm, 1500000));
balSheet.addLiability(new StatedEntry('liability', 'mortgage', LongTerm, 10000000));