[Openmcl-devel] Obfuscated Lisp contest anyone? (Seriously)

Ron Garret ron at flownet.com
Sun May 7 09:30:24 PDT 2023

Here is how I produced my code:

https://flownet.com/ron/lambda-calculus.html <https://flownet.com/ron/lambda-calculus.html>

The λ macro is defined in the introduction.


> On May 7, 2023, at 6:58 AM, Tim McNerney <mc at media.mit.edu> wrote:
> I like the educational angle, which is kinda the antithesis of obfuscation. Calling it the “short, sweet, and elegant contest” captures the spirit.
> The obfuscated C winner I most liked was a (tiny) BASIC interpreter compressed into 1,500 bytes of source code. It became completely understandable after I macroexpanded it. 
> Ron,
> I fiddled with your “entry.”
> Transforming lambda into let when appropriate didn’t help readability. The overall style looks Y combinator-ish, which alas I’ve never wrapped my head around. Is there source to source transform that turns this style into recursive code?
> --Tim
>> On May 7, 2023, at 11:02, Adlai C <munchking at gmail.com> wrote:
>> On 4/15/23, Ron Garret <ron at flownet.com> wrote:
>>>>> On Apr 15, 2023, at 7:38 AM, Tim McNerney <mc at media.mit.edu> wrote:
>>>> Hmm… Is it crazy to contemplate launching an obfuscated Lisp contest?
>>> Here is my entry:
>>> ((λ f ((λ g (g g)) (λ (h x) ((f (h h)) x))))
>>> [...]
>> Is part of the competition figuring out the definition of the lambda
>> syntactic sugar? It's not necessarily the simplest imaginable
>> definition, due to possible ambiguity in the handling of the list
>> designator.
>> I think in general, due to the complexity and diversity of CL, such
>> competitions could be divided by theme, where one main competition
>> allows anything, with a separate category for entries specifically
>> focused on the [ab]use of one specific technique, whether readtables,
>> local functions, macros from hell, etc. Ideally such competitions
>> eventually produce good examples for educating future students.

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