From: Jeremy Henty <jeremy@...>
Date: 2002-09-05T09:05:46+09:00
Subject: Re: Breaking from 'case'

In article <20020905005626.A15456@profa.box.cz>, Wejn wrote:
> while run
>     case x
>         when 'b'
>             ``skip'' if cond # how ????
>             something_else
>         else
>             something
>     end
>     timer = Time.now
> end
> 
> Is there any possibility (in the example above) to skip the rest
> of "when 'b'" and continue at the line "timer = Time.now" using some
> keyword/statement?

My first impulse would be to wrap the case in a method and skip by
calling return, ie.: 

def munge(x)
  case x
  when 'b'
    return      
    something_else
  else
    something
  end
end

while run
  munge x
  timer = Time.now
end

*But* that tends not to refactor nicely: if you take code that
implements its control structure with return and factor some of it out
into a new method, then that new method may return to the wrong place.
If that is a fatal objection, or if you want to do it all inline, my
next impulse would be to use catch/throw, ie:

while run
  catch :skip do
    case x
        when 'b'
            throw :skip if cond # how ????, like this !!!!
            something_else
        else
            something
    end
  end
  timer = Time.now
end

HTH, 

Jeremy Henty