From: Mark Thomas <mark@...>
Date: 2008-10-21T00:23:52+09:00
Subject: Re: newbie adding to array question


> 1.is_fibonacci # returns true
> 2.is_fibonacci # returns true
> 3.is_fibonacci # returns false
>
> how could i do that?

Assuming you mean you want to see if a digit is in the answer (in
which case 3 would actually return true), you can do this:

class Fixnum
  def fibonacci?(n=10)
    fib(n).include? self
  end
end

puts 3.fibonacci?
#=> true
puts 4.fibonacci?
#=> false

-- Mark.