From: Frederick Ros <sl33p3r@...>
Date: 2005-12-13T21:01:00+09:00
Subject: Re: stable sort_by?

Kroeger, Simon (ext) wrote:

> Full Ack,
> 
> obviously sort_by isn't stable:
> 
> test = [[1, 'b'], [1, 'c'], [0, 'a']]
> p test.sort_by{|t|t[0]}
> 
> => [[0, "a"], [1, "c"], [1, "b"]]
> (ruby 1.8.2 (2004-12-25) [i386-mswin32])

Hummm not sure to understand ... You asked for a sort on the first item 
... So, in this case [1,"c"] and [1,"b"] are equivalent, and their order 
is un-important ...

If you do value the order of the 2nd item of the array too, you just 
have to specify it :

  test = [[1, 'b'], [1, 'c'], [0, 'a']]
  p test.sort_by{|t| t }

  => [[0, "a"], [1, "b"], [1, "c"]]

Best Regards,
Fred

-- 
Posted via http://www.ruby-forum.com/.