Arc Forumnew | comments | leaders | submitlogin
2 points by rocketnia 5098 days ago | link | parent

Right, but once again, adding a few characters may make things more consistent, but does it aid clarity? I really don't know either way.

Using the same heiroglyphics as I posted last time, we can implement 'case entirely as a function:

  ; Hypothetically, this uses the macros 'def, 'whenlet, 'iflet, and
  ; 'do; the functions 'if, 'testify, 'get, and 'apply; the special
  ; forms 'fn, 'zap, and 'quote; and the read macros
  ; #,x for (fn (gs123) (zap gs123 x)), #'x for (fn () x), and
  ; 'x for (quote x).
  
  (def #,case (subject . args)
    (whenlet (first . rest) args
      (iflet (then . rest) rest
        
        ; Check the testified result of (first) against the subject.
        (if (.subject:testify:do.first)
          
          ; Return the result of (then).
          then
          
          #'(apply case-part-2 subject rest))
        
        ; Return the result of (first). It's the last else.
        first)))
  
  ; was (case x y (dosomething))
  (case x #''y dosomething)
This is even an overall brevity boost, I think. What do you think of its clarity? I seriously might try this out in Penknife....


1 point by thaddeus 5098 days ago | link

Not sure. I find the #''y hard on the eyes :)

Though it reminds me a little on how clojure handles inline anonymous functions, which I really like:

    #{+ %1 %2} ;% being the args, %1 being the first, %2 the second, and so on
wondering if something similar is possible with case:

(case x #(myfun)(dosomething))

yet still able to:

(case x 'y (dosomething))

note: Sorry if I missed something and am suggesting non-sense stuff, I haven't yet looked into the code details you provided - so I could be out to lunch.

-----

1 point by rocketnia 5098 days ago | link

In case you missed the post I referred to, here it is: http://arclanguage.org/item?id=13240

All the necessary assumptions are listed in the top comment though (assuming you can intuit my intentions for the 'iflet macro, etc.). It's by no means implemented. ^^

Also, I welcome any switch in the heiroglyphics that makes them more readable. In Penknife, where there are infix operators but no read macros, I'd probably represent #''y as "thunk:sym.y" or "sym.y^". In Arc, ^'y looks like a good choice. Maybe :y or %y could be the zapper (or some better-suited abstraction over setforms).

-----

1 point by evanrmurphy 5097 days ago | link

> Maybe :y or %y could be the zapper (or some better-suited abstraction over setforms).

Maybe something with `=` in it?

-----