CoffeeScript price formatter

price.coffee

formatPrice = (price)->
  return '0' if isNaN(price)
  price = price + ''
  price = price.split(/\./)
  decimals = price[1]
  price = price[0]

  iterations = price.length / 3
  i = price.length
  segments = []
  while i > 0
    i = Math.max(0, i - 3)
    length =
      if i == 0 and parseInt(iterations) != iterations
        price.length - (Math.floor(price.length / 3) * 3)
      else
        3
    segments.unshift(price.substr(i, length))

  result = segments.join(' ') + formatDecimals(decimals)
  result

formatDecimals = (decimals)->
  return '' unless decimals?
  decimals = decimals + '0' if decimals.length == 1
  decimals = decimals.substr(0,2) if decimals.length > 2
  ",#{decimals}"

console.log formatPrice(30000)