[Ruby] enumerable methods 2

def fizzBuzz (max)
arr =[]
  (1...max).each do |num|
    if num % 3 == 0 && num % 5 != 0
      arr << num
    end
    if num % 3 != 0 && num % 5 == 0
      arr << num
    end
  end
return arr
end

print fizzBuzz (20)
  ------------------------

[3, 5, 6, 9, 10, 12, 18]