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Stable Sort (See related posts)

Stable sort method for the Array class. Acts like the original sort method and accepts blocks in the same way. (blog entry)

class Array
  def stable_sort
    n = 0
    c = lambda { |x| n+= 1; [x, n]}
    if block_given?
      sort { |a, b|
        yield(c.call(a), c.call(b))        
      }
    else
      sort_by &c
    end
  end
end
to ruby sort stable array by moser on Thu Sep 18 10:54:23 +0000 2008

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