4_years_ago.rb

def fibBuzz(n)
  i = 0
  fib0 = 1
  fib1 = 1
  puts "1"
  puts "1"
  while i < n
    i+=1
    fib2 = fib0+fib1
    fib0 = fib1
    fib1 = fib2

    str = ""
    if fib1 % 3 == 0
      str += "Fizz"
    end
    if fib1 % 5 == 0
      str += "Buzz"
    end
    if str.length == 0
      str = fib2.to_s
    end

    puts str
  end
end

fibBuzz(100)

now.rb

def fibbuzz(n)
  (1..100).inject([1,1]){|s| s<<s[-1]+s[-2] }.map{|i| i%15==0 ? "FizzBuzz" : i%3==0 ? "Fizz" : i%5==0 ? "Buzz" : i }
end

puts fibbuzz(100)