[Hope I've untangled/attributed the quotes correctly...]

John Thingstad <jpthing@online.no> wrote:
+---------------
| > "John Thingstad" <jpthing@online.no> writes:
| >> But following Rob Warnock's £ readmacro syntax idea.
| 
| Typo: should be $ readmacro.
+---------------

Actually, should be #$ readmacro. It's too minor to eat all of $.

Kent M Pitman  <pitman@nhplace.com>:
+---------------
| > (mapcar λ(format "~A:~A" λ1 λ2) list)
| Here, by contrast, I see lambdas.
+---------------

I don't, I just see weird two- or three- characters sequences.
Must be some UTF-8 or ISO-8859 thingies I can't see.

But here's a really twisted one for those with "dumb" terminals:
Instead of using FN to abbreviate LAMBDA, we can use /. which
kinda looks like a lambda is you squint:  ;-}

    > (defmacro /. (args &body body) `(lambda ,args ,@body))

    /.
    > (mapcar (/. (x) (* 3 x)) (iota 5))

    (0 3 6 9 12)
    > 

Kent M Pitman <pitman@nhplace.com> asked:
+---------------
| But I'm curious: how does the nesting of this macro work?  What does
|  (lambda (x)
|    (lambda (y z)
|      (f x y z)))
| look like in this shorthand format?
+---------------

With /. it's easy:

    (/. (x)
      (/. (y z)
	(f x y z)))

but of course with #$ you can't do it without introducing
a renaming variable [just like with nested shell functions]:

    #$(let ((x $1))
      #$(f x $1 $2))

But how often do you need to type that at the REPL? ...which is
where #$ was intended to be used, *NOT EVER* in coding source files!


-Rob

-----
Rob Warnock			<rpw3@rpw3.org>
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