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On 23/09/2018 01:18, Coda Highland wrote:

On Sat, Sep 22, 2018 at 2:51 AM, Lorenzo Donati
<lorenzodonatibz@tiscali.it> wrote:

On 11/09/2018 22:14, Roberto Ierusalimschy wrote:
[...]


local Y = function (le)
      local a = function (f)
        return le(function (...) return f(f)(...) end)
      end
      return a(a)
    end



OUCH! My brain hurts!

I can "feel" its beauty, but it's way over my functional head to understand!

(It almost reminds me of the difficulties of understanding Duff's device :-)



I dunno, Duff's device is pretty simple by comparison.
I didn't mean to compare the two things directly. I just compared how I felt when coming in contact with those. The bedazzling feeling is the same! :-)
I saw Duff's device for the first time probably 25+ years ago and I was waaaay less experienced as a programmer back then. Moreover (IIRC) it was in K&R book and I didn't have to understand it for my uni courses, so it was just a curiosity. I did understand it some years later (and it took me quite an effort). 

I totally agree that Roberto's example is far more mind-boggling.





/s/ Adam