comp.lang.ruby Google Group

Re: file.seek and unused bytes

li...@gregwillits.ws (Greg Willits) — Sun, 05 Jul 2009 17:08:11 UT

80's micros too with BASIC :-P
That makes a great deal of sense, and would be consistent with what I
was seeing. I was wondering why the values being returned were zeros
instead of nil or something else.
Either way, I know its a better practice to pack the rows, but I had a
moment of laziness because I'm dealing will a couple million rows and

Re: to_proc and Proc/block conversion with &

robert.do...@gmail.com (Robert Dober) — Sun, 05 Jul 2009 15:12:54 UT

Absolutely agree, but maybe this should go into rubyspec...
and sorry for hijacking.
Cheers
Robert

Re: to_proc and Proc/block conversion with &

dbl...@rubypal.com (David A. Black) — Sun, 05 Jul 2009 15:08:31 UT

Hi --
How odd. I wonder what the point of that is. I'd rather be warned if I
write Proc.new without a block, than have it default to the code
block.
But you're right that I'm wrong in correcting Joel. Rewind.
David

Re: Installing tar2rubyscript and rubyscript2exe

luislav...@gmail.com (Luis Lavena) — Sun, 05 Jul 2009 15:07:41 UT

Chiming in, quick question.
what "gem list tar2rubyscript -d" output?
Perhaps where these binaries got installed is not in your PATH, and
thus, not be able to execute them.
Also, what is the output of "gem env"?
When reporting issues with RubyGems (itself or gems that depend on
it), please provide the environment information for us to better help

Re: to_proc and Proc/block conversion with &

li...@bertram-scharpf.de (Bertram Scharpf) — Sun, 05 Jul 2009 14:52:17 UT

Hi,
Am Sonntag, 05. Jul 2009, 19:51:28 +0900 schrieb David A. Black:
Sorry, but these are not the same:
Proc.new
Proc.new { }
Try this:
def f ; Proc.new ; end
p = f { "hello" }
p.call
#=> "hello"
Bertram

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Re: to_proc and Proc/block conversion with &

dbl...@rubypal.com (David A. Black) — Sun, 05 Jul 2009 12:41:03 UT

Also, it seems to be the same in 1.8. So I guess a refinement of the
description would be: given &expr, if expr is a Proc object, use it as
the block; if not, call to_proc on it.
I don't know whether that's a language spec or just an implementation
detail. I vaguely hope the latter, though I suppose that something

Re: to_proc and Proc/block conversion with &

dbl...@rubypal.com (David A. Black) — Sun, 05 Jul 2009 12:33:26 UT

Hi --
I guess it's an optimization. So take my explanation as behavioral
rather than implementation-faithful.
David

Re: to_proc and Proc/block conversion with &

robert.do...@gmail.com (Robert Dober) — Sun, 05 Jul 2009 11:56:33 UT

It might be interesting to note that in Ruby1.9 the to_proc is not
called on Proc objects, I wonder what happened in 1.8
536/37 > ruby -rprofile -e '[1].map &Proc::new{|x| x+1}'
% cumulative self self total
time seconds seconds calls ms/call ms/call name
0.00 0.00 0.00 1 0.00 0.00 BasicObject#initialize

Re: How to remove/delete/destroy class variable in Ruby 1.9?

bartoszw...@googlemail.com (dzw!) — Sun, 05 Jul 2009 11:16:51 UT

Thank you guys, all your tips were very useful.
It was just dummy example(inspired from Pickaxe Book) that made me
thinking, remove_class_variable method was exactly what I looked for
[ I really cant believe I missed it :)).
and $$class_variable explanation works very well for my brain.
Big Cheers from Bart

Re: to_proc and Proc/block conversion with &

dbl...@rubypal.com (David A. Black) — Sun, 05 Jul 2009 10:51:28 UT

Hi --
That's not going to access the caller's code, though, since you're
creating a totally new Proc.
David

Re: file.seek and unused bytes

b.cand...@pobox.com (Brian Candler) — Sun, 05 Jul 2009 09:03:49 UT

I don't believe that's the case today. If it were, then you would have a
very easy way to examine the contents of unused sectors on the disk -
which would allow you to see other people's deleted files, passwords
etc.
It was possible on old mainframe systems in the 80's though :-)
But today, if you extend a file using seek, you should always read

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Re: Newbie help

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