From: Robert Klemme <bob.news@...>
Date: 2004-12-28T23:01:48+09:00
Subject: Re: help on making ruby code faster


"David Garamond" <lists@zara.6.isreserved.com> schrieb im Newsbeitrag
news:41D16479.8000408@zara.6.isreserved.com...
> Robert Klemme wrote:
> >>Can't Ruby currently optimize those? I frankly don't want to have to
do
> >>those kinds of optimization myself :-(
> >
> > It does (by sharing the internal string buffer) but it still has to
create
> > new String instances on each run:
> >
> >>>5.times { p 's'.id }
> >
> > 134947060
> > 134946988
> > 134696172
> > 134690592
> > 134690544
> > => 5
> >
> > If it would not do this, code like this would yield unexpected
results:
> >
> >>>5.times { p 'abc'[1] += 1 }
>
> I see. Suddenly I want immutable strings like in Python.

At least there is freeze.  In such a situation I do typically this:

class SillyExample
  FOO = "my prefix".freeze

  def prefix(s)
     FOO + s
  end
end

> Hm, it seems optimizing Ruby programs is pretty tedious? One has to
> scorch through every string literal...

No, only those that are performance critical. :-)

Regards

    robert