jjb/commaifier.rb

## commaifier.rb
def divisible_by_3?(number)
  number%3 == 0
end

def commaifier(number)
  reversed = number.to_s.reverse

  result = ""

  number.to_s.size.times do |i|
    result << reversed[i]
    result << "," if divisible_by_3?(i+1)
  end

  result.reverse
end

# > commaifier(25164150)
# => "25,164,150"
# > commaifier(1234567890)
# => "1,234,567,890"
	def divisible_by_3?(number)
	number%3 == 0
	end

	def commaifier(number)
	reversed = number.to_s.reverse

	result = ""

	number.to_s.size.times do \|i\|
	result << reversed[i]
	result << "," if divisible_by_3?(i+1)
	end

	result.reverse
	end

	# > commaifier(25164150)
	# => "25,164,150"
	# > commaifier(1234567890)
	# => "1,234,567,890"