From: David Alan Black <dblack@...>
Date: 2002-01-12T03:39:43+09:00
Subject: Re: gsub: arrays as parameters

Hello --

On Sat, 12 Jan 2002, Jack Dempsey wrote:

> I wrote this and it works well for me. I wanted to see what others
> thought, and ask if anyone (Matz?) knows the pros and cons of making a
> change like this to gsub.

It looks more like a new, different method (where the first argument
has to respond to each_with_index, which Regexp objects don't), rather
than a modification of gsub(!).

>
> class String
>    def gsubx!(regex,replace)
>       regex.each_with_index do |x,i|
>         self.gsub!(x,replace[i])
>       end
>    end
>
>    def gsubx(regex,replace)
>       str = self.dup
>       regex.each_with_index do |x,i|
>         str.gsub!(x,replace[i])
>       end
>       str
>    end

Couldn't that be:

   def gsubx(*args)
     dup.gsubx!(*args)
   end

> end

You've eliminated the block form -- i.e., your gsubx(!) doesn't take a
block, which gsub(!) does.  Also, I'm not exactly sure what this gains
you, over using a pattern with '|' in it.  I probably haven't puzzled
through it enough.  Can you give an example?


David

-- 
David Alan Black
home: dblack@candle.superlink.net
work: blackdav@shu.edu
Web:  http://pirate.shu.edu/~blackdav