From: hemant <gethemant@...>
Date: 2006-10-22T10:59:25+09:00
Subject: Re: break from block

On 10/21/06, ara.t.howard@noaa.gov <ara.t.howard@noaa.gov> wrote:
> On Sat, 21 Oct 2006, Farrel Lifson wrote:
>
> > On 20/10/06, Robert Klemme <shortcutter@googlemail.com> wrote:
> >> On 20.10.2006 16:37, Farrel Lifson wrote:
> >> > I'm just trying to optimise some code and I was wondering if doing
> >> >  block = lambda{|i| #processing; if i > 5; break}
> >> >  n.times &block
> >> > would be any faster than doing it directly.
> >>
> >> I do not know a single case where the lambda variant is faster than the
> >> direct block variant.  AFAIK that's because of the conversion that
> >> occurs.  The advantage of the lambda variant is rather that you can
> >> store the block away and reuse it multiple times.
> >>
> >> Regards
> >>
> >>         robert
> >
> >> From my informal benchmarking there's a very slight constant speedup
> > of about 1s for my program.
>
> what version are you running?  your original code works fine here:
>
>   harp:~ > cat a.rb
>   block = lambda{|i| p i; i > 5 ? break : nil}
>   42.times &block
>
>
>   harp:~ > ruby a.rb
>   0
>   1
>   2
>   3
>   4
>   5
>   6
>
>   harp:~ > ruby --version
>   ruby 1.8.4 (2005-12-01) [i686-linux]
>
>   harp:~ > uname -srm
>   Linux 2.4.21-47.EL i686
>
>   harp:~ > cat /etc/redhat-release
>   Red Hat Enterprise Linux WS release 3 (Taroon Update 8)
>
> can you show an actual error?

This is wierd , i got the same error here:

uname -a
Linux webfront 2.6.15-23-server #1 SMP Tue May 23 15:10:35 UTC 2006
i686 GNU/Linux

ruby -v
ruby 1.8.4 (2005-12-24) [i486-linux]

Dapper

How, come you are not getting the error?

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