test.coffee

@log = -> console.log.apply(console, arguments)

class @Animal
  constructor: (name = 'Abstract animal') ->
    @name = name

Animal::eat = (food) ->
  log(food)

class @Dog extends Animal
  constructor: ->
    super('Dog')

  blah: ->
    log "Blah Blah"

$ ->
  dog = new Dog

  log dog.name              # => Dog
  log dog instanceof Animal # => true
  log dog instanceof Dog    # => true