From: Alexey Verkhovsky <alex@...>
Date: 2004-07-18T04:34:31+09:00
Subject: [NUBY] Code sample from The Ruby Way

class String
                                                                                                                               def levenstein(other, ins=2, del=2, sub=1)
    # ins, del, sub are weighted costs
    return nil if self.nil?
    return nil if other.nil?
    ... proceed to calculate Levenstein distance between self and other
  end
end

I don't understand, what is this line for:

	return nil if self.nil?

Can self.nil? ever evaluate to true in a method of String???

Best regards,
Alexey Verkhovsky