From: Joel VanderWerf <vjoel@...>
Date: 2004-08-19T13:07:51+09:00
Subject: Re: proc return statement

Zach Dennis wrote:
> I am having problems returning a value from a proc object:
> 
> @@mappings.each{ |hsh|
>        begin
>          if( hsh['type'] == c['type'] ) then
>            eval( "comp=#{hsh['template']}" )
>            hsh.each_key{ |key|
>              m = proc { @@ignore.each{ |i| return true if( key == i ) } 
> }.call
>             puts m;
>            }
>            has_mapping = true;
>          end
>        rescue; raise "Unable to evaluate passed in expression: 
> #{hsh['template']}"; end
>        break if( has_mapping ); }
> 
> It is at the line:    m = proc { @@ignore.each{ |i| return true if( key 
> == i ) } }.call
> that I am having the problem. I want "m" to be true, but instead it 
> leaves the calling function.
> 
> I have modified the line to be:
> 
> m = nil;
> proc { @@ignore.each{ |i| m=true if( key == i ) } }.call
> 
> but I was just wondering if I could return a value w/o having to leave 
> the outer function.

Use break:

def fn
   m = proc {break 3}.call
   "m = #{m}"
end

p fn  # ==> "m = 3"