From: "David A. Black" <dblack@...>
Date: 2003-09-18T01:57:46+09:00
Subject: Re: scrambler one-liner

Hi --

On Thu, 18 Sep 2003, Peter wrote:

> >   def reorder(str)
> >     result = []
> >     while str.length > 0
> >       result << str.delete_at(rand(str.length))
> >     end
> >     result
> >   end
> > 
> >   def scramble(str)
> >     str.gsub!(/\B\w+\B/){reorder($&.split(//)).join}
> >   end
> 
> Here's a one-liner after all:
> 
> gsub!(/\B\w+\B/){proc{|s|Array.new(s.length){s.delete_at(rand(s.length))}}.call($&.split(//)).join}
> 
> It's longer for sure, but now you're sure the result is really random
> (provided you believe me it is ;-)

Inspired by the rand thing, I came up with:

  gsub!(/\B\w+\B/){|s|Array.new(s.size){s.slice!(rand(s.size)).chr}.join}

I leave it to the rand experts to tell me if this is really rand.  I
*think* it is, assuming that the first s.size gets evaluated once and
the second one gets evaluated each time through the loop.


David

-- 
David A. Black
dblack@wobblini.net