From: "Brian Schröder" <ruby@...>
Date: 2004-12-02T20:34:02+09:00
Subject: Re: singleton methods : when are they not permitted?

On Thu, 2 Dec 2004 19:12:43 +0900
"Robert Klemme" <bob.news@gmx.net> wrote:


> I prefer to view a literal as a special kind of expression that yields an
> instance on each execution.  Whether this is always the same instance (as
> for symbols, Fixnum and surprisingly also for Bignum and Regexp) or
> whether it's a different instance (as for strings, arrays and hashes)
> depends on the literal.

That regexps are always the same surprised me also, but it is nice. So it is
not optimization to extract a regexp into a constant instead of writing it in
the loop.

(Btw: Always when I'm trying to optimze something in ruby, it gets slower. Ruby
follows exactly my mindset when programming, and when I try to change my mind
on how the computer actually works it out, I'm running in the wrong
direction.;)

irb(main):005:0> 2.times do |i| puts /abc/.id end
538420744
538420744
=> 2

But it can't always be true

irb(main):006:0> 2.times do |i| puts /abc#{i}/.id end
538396754
538396704
=> 2

Or maybe one should clarify it such, that a regexp with interpolation is no
longer a literal.

Regards,

Brian

-- 
Brian Schr�der
http://www.brian-schroeder.de/