From: Stefan Rusterholz <apeiros@...>
Date: 2008-10-31T06:33:10+09:00
Subject: Re: how to sort this array

Li Chen wrote:
> Hi,
> 
> I have an array containing files names. How do I sort them so that I can
> get the expected results?
> 
> Thanks,
> 
> Li
> 
> #############
> files=[
>   "c:/ruby/self/2004/20.txt",
>   "c:/ruby/self/2004/3.txt",
>   "c:/ruby/self/2004/2.txt",
>   "c:/ruby/self/2004/10.txt",
>   "c:/ruby/self/2004/1.txt"
> ]
> 
> expected results:
> [
> "c:/ruby/self/2004/1.txt",
> "c:/ruby/self/2004/2.txt",
> "c:/ruby/self/2004/3.txt",
> "c:/ruby/self/2004/10.txt",
> ]
> "c:/ruby/self/2004/20.txt",

You get that result because in "2" <=> "10" the comparison is byte by 
byte and then "2" is > "1", so it aborts there with "2" being > than 
"10".
What you want is called natural sorting. Googling for natsort and ruby 
you should get a few results.

Regards
Stefan
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