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Re: CL package serious deficiencies
From: |
Juanma Barranquero |
Subject: |
Re: CL package serious deficiencies |
Date: |
Sat, 11 Feb 2012 14:25:00 +0100 |
On Fri, Feb 10, 2012 at 20:08, Teemu Likonen <address@hidden> wrote:
> Here's one example:
>
> (defun delete-nth (n sequence)
> (delete-if (constantly t) sequence :start n :count 1))
BTW,
(defun delete-last-nth (n sequence)
(delete-if (lambda (_) (minusp (decf n))) sequence :from-end t :count 1))
should work, and it does in SBCL
* (defun delete-last-nth (n sequence) (delete-if (lambda (_) (minusp
(decf n))) sequence :from-end t :count 1))
; in: DEFUN DELETE-LAST-NTH
; (LAMBDA (_) (MINUSP (DECF N)))
; ==>
; #'(LAMBDA (_) (MINUSP (DECF N)))
;
; caught STYLE-WARNING:
; The variable _ is defined but never used.
;
; compilation unit finished
; caught 1 STYLE-WARNING condition
DELETE-LAST-NTH
* (delete-last-nth 0 '(a b c))
(A B)
* (delete-last-nth 1 '(a b c))
(A C)
* (delete-last-nth 2 '(a b c))
(B C)
but not in elisp:
ELISP> (delete-nth-from-end 0 '(a b c))
(a b)
ELISP> (delete-nth-from-end 1 '(a b c))
(a b)
ELISP> (delete-nth-from-end 2 '(a b c))
(a b)
That is a bug, I gather.
Juanma
- Re: CL package serious deficiencies, (continued)
- Re: CL package serious deficiencies, Johan Bockgård, 2012/02/10
- Re: CL package serious deficiencies, Helmut Eller, 2012/02/10
- Re: CL package serious deficiencies, Stefan Monnier, 2012/02/10
- Re: CL package serious deficiencies, Lars Ingebrigtsen, 2012/02/10
- Re: CL package serious deficiencies, Helmut Eller, 2012/02/10
- Re: CL package serious deficiencies, Stefan Monnier, 2012/02/12
- Re: CL package serious deficiencies, Helmut Eller, 2012/02/12
- Re: CL package serious deficiencies, Stefan Monnier, 2012/02/12
- Re: CL package serious deficiencies, Helmut Eller, 2012/02/12
- Re: CL package serious deficiencies, Teemu Likonen, 2012/02/11
- Re: CL package serious deficiencies,
Juanma Barranquero <=
- Re: CL package serious deficiencies, Johan Bockgård, 2012/02/11
- Re: CL package serious deficiencies, Juanma Barranquero, 2012/02/11
- Re: CL package serious deficiencies, Stefan Monnier, 2012/02/12
- Re: CL package serious deficiencies, Teemu Likonen, 2012/02/12
- Re: CL package serious deficiencies, Stefan Monnier, 2012/02/12
- Re: CL package serious deficiencies, Stefan Monnier, 2012/02/12
- Re: CL package serious deficiencies, Dimitri Fontaine, 2012/02/19