From: Simen Edvardsen <toalett@...>
Date: 2006-08-16T23:05:03+09:00
Subject: Re: goto function?

On 8/16/06, Christian Neukirchen <chneukirchen@gmail.com> wrote:
> "David Vallner" <david@vallner.net> writes:
>
> > The BASIC construct of "goto" is rightfully considered harmful for
> > programs above a certain complexity. It's not present in Ruby in any
> > direct way that would let you jump around a program's structure
> > arbitrarily. (Actually, that's a lie, but I'll hold the continuations
> > for  the sake of simplicity.)
>
> It is often said that continuations are as powerful as goto.
> But is there a way to jump *forward* with continuations, without
> rewriting the code to use additional methods?
>
> > David Vallner
> --
> Christian Neukirchen  <chneukirchen@gmail.com>  http://chneukirchen.org
>
>

A continuation is, by definition, the *continuation* of the
computation. But that probably wasn't the answer you wanted. There's
no way to do:

goto :a
label :a

Even though it's easy to create label and goto methods that work like this:

label :a
puts "after a"
goto :a if rand(2) % 2 == 0

-- 
- Simen