From: Robert Klemme <bob.news@...>
Date: 2004-02-14T01:09:55+09:00
Subject: Re: return from yielded block


"Ara.T.Howard" <ahoward@fattire.ngdc.noaa.gov> schrieb im Newsbeitrag
news:Pine.LNX.4.44.0402130622000.31453-100000@fattire.ngdc.noaa.gov...
> On Fri, 13 Feb 2004 nobu.nokada@softhome.net wrote:
>
> > Date: Fri, 13 Feb 2004 15:08:34 +0900
> > From: nobu.nokada@softhome.net
> > Newsgroups: comp.lang.ruby
> > Subject: Re: return from yielded block
> >
> > Hi,
> >
> > At Fri, 13 Feb 2004 14:54:56 +0900,
> > Ara.T.Howard wrote in [ruby-talk:92771]:
> > > the problem is that you can't 'return' from a block - so how is this
done?
> >
> > Return to where?  The next statement of yield?
> > If so, you may want "next".
>
> return a value.  i was not clear enough, let me try again:
>
> def meth s
>   x =
>     block_meth do
>       if s =~ /forty/
>         return 40
>       else
>         return 0
>       end
>     end
>   x + 2
> end
>
> def block_meth; yield; end
>
> p(meth('forty')) # this prints 40 - i want it to print 42

Simply delete the "return"'s:

irb(main):001:0> def meth s
irb(main):002:1>   x =
irb(main):003:1*     block_meth do
irb(main):004:2*       if s =~ /forty/
irb(main):005:3>         40
irb(main):006:3>       else
irb(main):007:3*         0
irb(main):008:3>       end
irb(main):009:2>     end
irb(main):010:1>   x + 2
irb(main):011:1> end
=> nil
irb(main):012:0>
irb(main):013:0* def block_meth; yield; end
=> nil
irb(main):014:0>
irb(main):015:0* p(meth('forty')) # this prints 40 - i want it to print 42
42
=> nil
irb(main):016:0>

I guess you are aware of the fact that this kind of construction is a bit,
err, complicated and your real world code does a lot more in between...
:-)

Regards

    robert