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1. andsoitis · 1790528956 · focus · HN ↗

   Here are 3 lines that capture something profound about Lisp: code can manufacture code that manufactures code:

   ———————

   (defmacro twice (form)

     `(progn ,form ,form))
   

   (twice (print "Reality"))

   ———————

   twice doesn’t execute its argument twice. It rewrites the program itself before execution into:

   (progn

       (print "Reality") 
   
       (print "Reality"))

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