class BeverageContainer

   name = ""
   maxCapacity = 0
   capacity = 0
  constructor: (@name, @max) ->
    @name = name
    @maxCapacity = max

  fill: (value) ->
    vars[0] = if vars[0] <= vars[1] then vars[0] else vars[1]
    alert("Filled by {$vars[0]}")

class Cup extends BeverageContainer
  constructor: ->
    super "Cup", 20;
  fill: ->
    alert("worked")
    super @value

cup = new BeverageContainer "cup", 400
cup.fill(42)