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extend = (target) ->
  return unless arguments[1]

  for property in arguments
    sourceProp = property
    for prop of sourceProp
      if not target[prop] and sourceProp.hasOwnProperty(prop)
        target[prop] = sourceProp[prop]
  return


Person = (name) ->
  @name = name

Dog = (name) ->
  @name = name


speaker =
  speak: ->
    "#{@name} is speaking"

mover =
  walk: ->
    "#{@name} is walking"
  run: ->
    "#{@name} is running"

arithmetic =
  add: ->
    "#{@name} is adding numbers together"
  multiply: ->
    "#{@name} is multiplying numbers together"

extend(Person::, speaker, mover, arithmetic)
extend(Dog::, speaker, mover)

john = new Person "John Doe"
fido = new Dog "Fido"
fido.walk()
john.walk()