From: Robert Klemme <shortcutter@...>
Date: 2007-05-29T16:55:04+09:00
Subject: Re: How to improve iteration

On 28.05.2007 19:47, Sebastian Hungerecker wrote:
> Chas Conquest wrote:
>> Could you please point out how I can make this code more
>> compact/cleaner/smarter???
> 
> I'll try:
> 
> ar = ["a.txt", "b.txt", "c.txt", "d.txt", "e.txt"]
> br = ["first.txt", "second.txt", "third.txt", "fourth.txt", "fifth.txt"]
> 
> class FileNameSwap
> # I don't know why you chose to make a class for this, but since you did I'll
> # at least store the arrays as instance variables
>   
>   def initialize(letters,ordinals)
>     @letters=letters  
>     @ordinals=ordinals
>   end
> 
>   def switch
>     @letters.zip(@ordinals).each do |letter, ordinal|
>       if File.file? letter
>         File.rename(letter, ordinal)
>       else
>         File.rename(ordinal, letter)
>       end
>     end
>   end
> end
> 
> switcher = FileNameSwap.new(ar,br)
> switcher.switch

And a strange variant of this:

   def switch(letters, ordinals)
     letters.zip(ordinals).each do |*a|
       File.rename(*(File.file? a[0] ? a : a.reverse))
     end
   end

:-)

	robert


PS: Sorry to all who expected an #inject solution. ;-)