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gistfile1.coffee

# moved internal properties to arguments.callee so 
# we don't have to worry about name collisions with our
# context.

tco = (fn) ->
  (args...) ->
    my = arguments.callee

    my.recurred = false
    my.args = []
    my.recur = (args...) =>
      my.recurred = true
      my.args = args

    returnVal = fn.apply this, args
    while true
      if my.recurred
        tempArgs = my.args
        my.args = undefined
        my.recurred = false
        returnVal = fn.apply this, tempArgs
      else
        return returnVal





#==============================================
factorial = tco (n, acc = 1) ->
  if n is 0
    acc
  else
    factorial.recur n - 1, acc * n

console.log factorial 100000
#==============================================

console.log factorial 60


factorialWithCtx = tco (n, acc = 1) ->
  if n is 0
    acc
  else
    @iterations++
    factorialWithCtx.recur n - 1, acc * n

counter =
  iterations: 0
console.log factorialWithCtx.call counter, 100000
console.log counter.iterations