From: RichardOnRails <RichardDummyMailbox58407@...>
Date: 2008-08-02T14:38:57+09:00
Subject: Re: A couple of basic questions

On Jul 30, 3:33 am, Robert Klemme <shortcut...@googlemail.com> wrote:
> 2008/7/30 RichardOnRails <RichardDummyMailbox58...@uscomputergurus.com>:
>
>
>
> > Hi,
>
> > Q.1: I was processing file/dir names with the following snippet:
>
> > Find.find(wd) do |item| # Subordinate file/directory fully-qualified
> > names
> >  if File.directory?(item)
> >    # Process directory name
> >    if item =~ /portfolio/i
> >      item_saved = '  ' + item
> >      item.gsub!(/portfolio/, 'position')
>
> > When I saved item in item_saved without modification,  the gsub change
> > both the item name as well as the saved name (because what was saved
> > was a reference to item, not item's content).  So my work-around was
> > to save a modified name. That doesn't seem like "The Ruby Way".
> > What's a better way?
>
> Leave item alone and store the new name in a new variable:
>
> if ...
> new_item = item.gsub(/portfolio/, 'position')
>
> (notice the missing "!")
>
> > Q. 2:  In that same snippet,  I made two substitutions:
>
> >      item.gsub!(/portfolio/, 'position')
> >      item.gsub!(/Portfolio/, 'Position')
>
> > That's also a kluge.  But the following didn't compile:
>
> >      item.gsub!(/([pP])ortfolio/, $1 + 'osition')
>
> This cannot work because $1 is evaluated only once, i.e. before #gsub
> is invoked.  You need something like Phlip suggested.
>
> item.gsub /([pP])ortfolio/, '\\1osition'
>
> > Is there a "Ruby Way" to reduce the redundancy?
>
> Yes.
>
> Cheers
>
> robert
>
> --
> use.inject do |as, often| as.you_can - without end

Hi Philip & Robert,

Thank you both very much for clearing the fog from my brain :-)  BTW,
the deity of choice for me is the null set :-)

Best wishes,
Richard