Phase 1 in_words function TO ZILLIONS! (with TDD)

in_words_tyler_and_nick

ONES_PLACE = {
  1 => "one",
  2 => "two",
  3 => "three",
  4 => "four",
  5 => "five",
  6 => "six",
  7 => "seven",
  8 => "eight",
  9 => "nine"
}

TENS_PLACE = {
  1 => "ten",
  2 => "twenty",
  3 => "thirty",
  4 => "forty",
  5 => "fifty",
  6 => "sixty",
  7 => "seventy",
  8 => "eighty",
  9 => "ninety"
}

ZILLIONTH_PLACE = {
  1 => "thousand",
  2 => "million",
  3 => "billion",
  4 => "trillion",
  5 => "quadrillion",
  6 => "pentillion"
}

 # 10 ^ n*3

# 453 937
def in_words(num)
  ZILLIONTH_PLACE.keys.reverse.each do |i|
    zeroes = 10**(i*3)
    if num >= zeroes
      return "#{in_words(num/zeroes)} #{ZILLIONTH_PLACE[i]}" if num%zeroes == 0
      return "#{in_words(num/zeroes)} #{ZILLIONTH_PLACE[i]} #{in_words(num%zeroes)}"
    end
  end

  # if num >=1000000000
  #   return "#{in_words(num/1_000_000_000)} billion" if num%1000000000 == 0
  #   return "#{in_words(num/1_000_000_000)} billion #{in_words(num%1000000000)}"
  # end

  # if num >= 1000000
  #   return "#{in_words(num/1_000_000)} million" if num%1000000 == 0
  #   return "#{in_words(num/1_000_000)} million #{in_words(num%1000000)}"
  # end

  # if num >= 1000
  #   return "#{in_words(num/1000)} thousand" if num%1000 == 0
  #   return "#{in_words(num/1000)} thousand #{in_words(num%1000)}"
  # end

  words = ""

  if num >= 100
    hundreds = num/100
    words+= "#{ONES_PLACE[hundreds]} hundred"
    num -= hundreds * 100
    words += ' ' if num % 100 != 0
  end

  if num >= 10
    tens = num/10
    words+= TENS_PLACE[tens]
    words += ' ' if num % 10 != 0
    num -= (tens * 10)
  end

  if num > 0
    ones = num % 10
    words+= ONES_PLACE[ones]
    num -= ones
  end

  words
end

def assert(anything)
  raise "Bummer, man" unless anything
end

assert(in_words(1) == "one")
assert(in_words(2) == "two")
assert(in_words(10) == "ten")
assert(in_words(20) == "twenty")
assert(in_words(21) == "twenty one")
assert(in_words(100) == "one hundred")
assert(in_words(101) == "one hundred one")
assert(in_words(122) == "one hundred twenty two")
assert(in_words(1000) == "one thousand")
assert(in_words(1001) == "one thousand one")
assert(in_words(453937) == "four hundred fifty three thousand nine hundred thirty seven")
assert(in_words(1001001) == "one million one thousand one")
assert(in_words(1000000) == "one million")
assert(in_words(1001001001) == "one billion one million one thousand one")




puts 'you got it!'