c(a|d)ⁿr
By Eutro
car, cdr, caaaaddddr, and everything in between.
(require cadnr) package: cadnr
c(a|d)ⁿr
This module extends a number of built-in Racket functions that have obvious arbitrary extensions.
Announcement: https://racket.discourse.group/t/c-a-d-r-car-cdr-caaaaddddr-and-everything-in-between/1876
(Discourse is an open source platform and the racket discourse does not track you or require a sign-in)
A package? Pfft.
My first real programming task when I became a freshman intern at my Univ's computing center was to write a Lisp interpreter for their Burroughs B3500 mainframe. In assembly lang. On punched cards, of course -- it was 1969.
My interpreter detected C{A,D}^nR functions, for any n, and evaluated them directly. 🧙♂️
I think it could be possible to take a different approach, instead od defining functions beforehand, create a language extension that could interpret those combinations in compile time (during macro expansion).
@xgqt @JorgeStolfi @racketlang
Looking at the docs and code, i think this is doing exactly that.
Like the interpreter @JorgeStolfi created, this detects C{A,D}nR functions, for any n.
Unlike the interpreter version, this happens at macro expansion - extending the racket compiler handle arbitrary combinations - so will be as fast as the native functions at run time.
@ccshan @racketlang
Yes!
Challenge the author at https://racket.discourse.group/t/c-a-d-r-car-cdr-caaaaddddr-and-everything-in-between/1876
Racket
Jorge Stolfi
Maciej Barć
Stephen De Gabrielle
Chung-chieh Shan 單中杰