class MyClass
attr_accessor :name, :unit_price
def initialize(name, unit_price)
@name, @unit_price = name, unit_price
end
def price(quantity=1)
@unit_price * quantity
end
alias :cost :price
alias :unit_cost :unit_price
alias :unit_cost= :unit_price=
def cost(*args)
price(*args)
end
end
bacon = MyClass.new("Bacon", 3.95)
bacon.cost(100) # => 399.0