From: brabuhr@...
Date: 2008-11-26T02:15:45+09:00
Subject: Re: [QUIZ] Befunge (#184)

On Tue, Nov 25, 2008 at 11:42 AM, Rob Biedenharn
<Rob@agileconsultingllc.com> wrote:
> On Nov 25, 2008, at 11:07 AM, brabuhr@gmail.com wrote:
>> almost entirely untested) implementation built around define_method:
>>
>> bf.run #=> 3
>
> Seems like this program is:
>
> 1 1 + 2 3 + - .
>
> Which seems to be -3, not 3.  I think you have your args out of order.  Look
> at how the non-commutative ops are defined.

Yeah, that would be part of the entirely untested stuff ;-)

 %w{ + * }.each do |o|
   define_method :"#{o}" do
     a, b = @stack.pop, @stack.pop
     @stack.push a.send(:"#{o}", b)
   end
 end
 %w{ - / }.each do |o|
   define_method :"#{o}" do
     b, a = @stack.pop, @stack.pop
     @stack.push a.send(:"#{o}", b)
   end
 end

or, maybe some would prefer:
 %w{ - / }.each do |o|
   define_method :"#{o}" do
     a, b = @stack.pop, @stack.pop
     @stack.push b.send(:"#{o}", a)
   end
 end