class Integer

# File lib/fibo-galv.rb, line 17
def closest_fibonacc
  old_fibonacci = 0

  catch :done do
    (1..self).each do |index|
      actual_fibonacci = index.fibonacci
      throw :done if self < actual_fibonacci
      old_fibonacci = actual_fibonacci
    end
  end

  old_fibonacci
end

# File lib/fibo-galv.rb, line 2
def fibonacci
  f2 = 1
  f1 = 0
  fn = 0
  if self > 0
    fn = (1..self).inject do |result, index|
      result = result + f1
      f1 = f2
      f2 = result
    end
  end

  fn
end