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From: Lawrence D'Oliveiro
Newsgroups: comp.os.linux.advocacy
Subject: Re: Why Python When There Is Perl?
Date: Fri, 22 Mar 2024 02:06:08 -0000 (UTC)
Organization: A noiseless patient Spider
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On 22 Mar 2024 01:43:02 GMT, rbowman wrote:
> As I worked through the exercises I was mentally
> calculating how I would do it in C.
C doesn’t put call frames on the heap, or even allow nested functions
(as standard), so I don’t know how you would handle closures.
> If you want to talk about lexical oddities, there's the 73 stacked up
> parens.
I keep them straight by indentation, e.g.
(defun convert-to-region-codes (beg end)
"converts alphabetic characters in the selection to “region indicator symbols”."
(interactive "*r")
(unless (use-region-p)
(ding)
(keyboard-quit)
) ; unless
(let
(
deactivate-mark
(intext (delete-and-extract-region beg end))
c
)
(dotimes (i (- end beg))
(setq c (elt intext i))
(cond
((and (>= c ?A) (<= c ?Z))
(setq c (+ (- c ?A) #x1F1E6))
)
((and (>= c ?a) (<= c ?z))
(setq c (+ (- c ?a) #x1F1E6))
)
) ; cond
(insert-char c)
) ; dotimes
) ; let
) ; convert-to-region-codes
What makes this sort of idiosyncrasy worthwhile is a thing called
“homoiconicity”. It’s a pretty cool feature, though not obvious at
first sight.
> I shouldn't be so snotty.
No problem. Your impressions are all too common among those new to
Lisp.
> After all I used Forth back in the day and threaded interpreted
> languages are a wonder to behold.
Now there is something that is nowadays only fit to be in a museum ...