simple BigDecimal in CoffeeScript

bigdecimal.coffee

class BigDecimal
  constructor: (number, @precision) ->
    @number = @gobble(number)

  plus: (other) ->
    @bd @number + @gobble(other)

  minus: (other) ->
    @bd @number - @gobble(other)

  div: (other) ->
    @bd @number / @gobble(other)

  mult: (other) ->
    @bd @number * @gobble(other)

  toString: ->
    @number.toString()

  toFixed: (precision) ->
    @number.toFixed(precision)

  equals: (other) ->
    @gobble(other) == @number

  gobble: (number) ->
    parseFloat(number.toFixed(@precision))

  bd: (input) ->
    new BigDecimal(@gobble(input), @precision)

a = new BigDecimal(0.1, 2)
b = new BigDecimal(0.2, 2)
c = new BigDecimal(0.3, 2)

console.log(a.plus(b))
console.log(c)
console.log(a.plus(b).equals(c))

Ran across this while doing some BigDecimal research. At cursory glance it looks like this will pseudo handle the precision issue by hiding it, but since it still relies on a float it's still limited to a max number of 2^53.