Can we do a " go label " in ruby just like in asm? i cant find any
example or documentation about this…
for example…
if()
some codes
go LabelA
else
some other codes
go LabelB
end
LabelA:
codes
LabelB:
codes
How surreal… someone named RubyTalk is posting to ruby-talk and
instructing us to goto a project called ruby-goto. 
Hi,
I agree on the case/when statement. But I don’t think throw/catch is a
true
alternative. It should be reserved for error handling only.
Regards,
Nicolai
On 24.12.2008 07:36, Xx Xx wrote:
Cant download from the link http://raa.ruby-lang.org/project/ruby-goto/
IMHO “goto” is the worst tool you can use. One of the alternatives is
catch and throw
catch :foo do
…
throw :foo
…
throw :foo, any_value_you_like
…
end
Another helpful construct is “case” which can be used in two forms
case value
when condition
…
else
end
case
when expression
…
else
end
If you give us more information about the problem you are trying to
solve we might be able to come up with better solutions.
Cheers
robert
Robert K. wrote:
No, for error handling you use “raise” and “rescue”. Please pay close
attention to how “catch” and “throw” work, especially the fact that you
can use a second argument to “throw” to pass an object (presumably the
result of a calculation).
Then just use return.
(-:
On 24.12.2008 13:26, Codeblogger wrote:
I agree on the case/when statement. But I don’t think throw/catch is a true
alternative. It should be reserved for error handling only.
No, for error handling you use “raise” and “rescue”. Please pay close
attention to how “catch” and “throw” work, especially the fact that you
can use a second argument to “throw” to pass an object (presumably the
result of a calculation).
Cheers
robert
Hi Xx,
Am Mittwoch, 24. Dez 2008, 15:36:27 +0900 schrieb Xx Xx:
Cant download from the link http://raa.ruby-lang.org/project/ruby-goto/
Link broken?
Just googling:
http://raa.ruby-lang.org/cache/ruby-goto/ruby-goto.tar.gz.
As the author himself admits
(http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-talk/72922),
this is more a puzzle than of any functional avail.
You should be glad not to be tempted practising this dangerous
programming style. I did not miss the goto statement in any
language for about twenty-five years. Be confident.
Merry Christmas to all!
Bertram
On 24.12.2008 16:21, Phlip wrote:
Robert K. wrote:
No, for error handling you use “raise” and “rescue”. Please pay close
attention to how “catch” and “throw” work, especially the fact that
you can use a second argument to “throw” to pass an object (presumably
the result of a calculation).Then just use return.
If it can be used that would definitively my first choice. Sometimes it
can’t and in these - admittedly rather rare - circumstances you should
rather use catch throw than goto IMHO.
Cheers
robert
Bertram S. wrote:
Hi Xx,
You should be glad not to be tempted practising this dangerous
programming style. I did not miss the goto statement in any
language for about twenty-five years. Be confident.Merry Christmas to all!
Bertram
I used goto to implement a parser for ISO 8601 (in C, generated by ruby)
and it is very handy for that. It’s just too easy to implement a
statemachine with gotos. But besides generated code (which isn’t
intended to be very readable) I do agree that goto is a bad choice.
I think it’s just as bad to call a tool all-evil as to use a tool in the
wrong place.
Regards & merry christmas
Stefan
On Thu, Dec 25, 2008 at 12:47 PM, Stefan R. [email protected]
wrote:
I used goto to implement a parser for ISO 8601 (in C, generated by ruby)
and it is very handy for that. It’s just too easy to implement a
statemachine with gotos. But besides generated code (which isn’t
intended to be very readable) I do agree that goto is a bad choice.
I think it’s just as bad to call a tool all-evil as to use a tool in the
wrong place.
As a matter of fact gotos can make your code clearer, but that has
been discovered a long time agoand those gotos have been disguised
into exit/break, continue, next, redo, case, throw-catch,
raise-rescue.
Modern languages like Ruby really have all the gotos you should wish
for.
I however understand that you used gotos in your C state-machine.
But IIRC we were talking about Ruby-goto, right ;).
Cheers
Robert