LOW_BAR = 48 -- '0' in ascii

-- number -> string
itoa = (n) ->
  with ret = ""
    negative = false
    if n < 0
      negative = true
      n = n * -1

    n = math.floor n -- no decimals.

    while true
      myn = n % 10
      ret = string.char(myn + LOW_BAR) .. ret

      n = math.floor(n / 10)

      break if n == 0

    ret = "-" .. ret if negative

print itoa 42
print itoa 420
print itoa 4200
print itoa -999