Simple shopping cart class written in coffeescript

ShoppingCart.coffee

# Items have the following properties : ID (string), size (string), sizeDisplay (string), price (int)

class ShoppingCart

  constructor: (@shipping = 5) ->
    @items = []

  _listItems: -> @items

  addItem: (item) ->
    @items.push item

    $(window).trigger 'shopping-cart:item-added', [item]

  removeItem: (index) ->
    @items.splice index, 1

    $(window).trigger 'shopping-cart:item-removed', [index]

  calculateTotal: ->
    total = 0
    for i in [0...@items.length] by 1
      total += @items[i].price

    total + @shipping;

  getTotal: -> do @calculateTotal

  numItems: -> @items.length

  getItem: (i) -> @items[i]

  getItems: -> @items