Basic Fizzbuzz

fizzbuzz.rb

def is_fizz(number)
  number % 3 == 0 and number.to_s[-1] == "3"
end

def is_buzz(number)
  number % 5 == 0 and number.to_s[-1] == "5"
end

def fizzbuzz(number)
  return 'FizzBuzz' if is_fizz(number) and is_buzz(number)
  return 'Fizz' if is_fizz(number)
  return 'Buzz' if is_buzz(number)
  number
end

1.upto(20) do |number|
  puts fizzbuzz(number)
end