I'm getting back to playing with newLISP! -
The following code broke when I used setf or setq! Why is that? What is the subtle diffs between the three? I want to grok this ASAP - so that I don't spin my wheel ever again with setting a symbol, etc. TIA
(set 'vowels '("a", "e", "i", "o", "u"))
;; define a function called pig-latin
(define (in-pig-latin this-word)
(set 'first-letter (first this-word))
(if (find first-letter vowels)
(append this-word "ay") ; concatenate word and "ay"
(append (slice this-word 1) first-letter "ay"))) ; concatenate
;; test the function
(println (in-pig-latin "red"))
(println (in-pig-latin "orange"))
(exit 0)
;; output is
;;edray
;;orangeay
;;Notes: the setf and setq function BROKE the code when I tried to use them
;; Why was that? When is setf and setq used in NL?
Hmm, did you have the variable quoted maybe?
Quote from: "ralph.ronnquist"Hmm, did you have the variable quoted maybe?
Are you asking if I used setf/setq
Regardless of how I screwed up though (and I
Description in manual is short and simple
//http://www.newlisp.org/downloads/newlisp_manual.html#setf
Quote from: "vetelko"Description in manual is short and simple
//http://www.newlisp.org/downloads/newlisp_manual.html#setf
I
Hi,
Shortly,
They are "special forms".
If the first argument is a symbol, the value of the evaluated second argument is assigned directly to that symbol, without evaluating the first argument.
Otherwise, the first argument is evaluated and if the result is a valid reference, the second argument value is destructively assigned to the place, where the reference points.
s.v.
@s.v. Thanks! I will read your reply carefully and as an exercise, I will fabricate some examples to prove your points.
I have been using (set 'a-symbol blah blah) as an equivalent to (setq a-symbol blah blah). Maybe that was a bad assumption!
Thx for the input ...