From: matu <m@...>
Date: 2008-07-30T06:34:26+09:00
Subject: Re: the old sorting ip addresses problem

Martin DeMello wrote:

> a.sort_by {|x| x.split(/\./).map {|i| i.to_i}}.reverse
> 
> => ["192.168.0.1", "19.18.16.15", "10.150.51.1", "10.150.50.2",
> "10.150.50.1", "5.100.200.50"]
> 
> This relies on the fact that ruby has built-in array sorting, where
> it'll sort by the first element, then break ties on the second
> element, and so on, and a built-in sort_by function, that transforms a
> collection according to the block given, and sorts by the transformed
> values.
> 

thanks. this is much cleaner.