From: Tobias Reif <tobiasreif@...>
Date: 2002-02-11T19:17:02+09:00
Subject: Re: array diff

Hi,
nobu.nokada@softhome.net wrote:


> class Array
>   def diff(a)
>     ary = dup
>     a.each {|i| ary.delete_at(i) if i = ary.index(i)}
>     ary
>   end
> end
> 
> p [1,2,3].diff [3,1]		# => [2]
> p [1,2,3,3].diff [3,3,1]	# => [2]
> p [1,1,1].diff [1,1]		# => [1]


But
[1,1].nobus_diff [1,1,1]
  -> []

So here#s what I had

   def diff other
     if self.length >= other.length
       longer  = self.dup
       shorter = other.dup
     elsif self.length <= other.length
       longer  = other.dup
       shorter = self.dup
     end
     shorter.each do |el|
       if longer.index(el)
         longer.delete_at longer.index(el)
       end
     end
     longer
   end

Tobi

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