Re: How can I sort symbols in alphabetical order?
Mattias Nilsson
> How can I sort symbols in alpahbetical order?
Well, I'm just a beginner, but here's my attempt:
(sort '(car window apple) #'string< :key #'symbol-name)
Note that it both takes and returns a list of symbols.
Mattias.
Timofei Shatrov
to confuse everyone with this message:
>How can I sort symbols in alpahbetical order? I mean:
>
>(my-dear-function '(car) '(window) '(apple)) should return
>
>apple
>car
>window
>
>or something like that. Is there a built-in function?
>
>Thanks in advance.
>
A simple combination of three built-in functions will do the job.
(sort '(car window apple)
(lambda (x y) (string< (symbol-name x) (symbol-name y))))
--
|a\o/r|,-------------.,---------- Timofei Shatrov aka Grue ------------.
| m"a ||FC AMKAR PERM|| mail: grue at mail.ru http://grue3.tripod.com |
| k || PWNZ J00 || Kingdom of Loathing: Grue3 lvl 18 Seal Clubber |
`-----'`-------------'`-------------------------------------------[4*72]
Lars Brinkhoff
> (sort '(car window apple) #'string< :key #'symbol-name)
gr...@mail.ru (Timofei Shatrov) writes:
> (sort '(car window apple)
> (lambda (x y) (string< (symbol-name x) (symbol-name y))))
Note that sort is advertised as a destructive function, and you pass
it a quoted object.
Mattias Nilsson
> "Mattias Nilsson" <matt...@bredband.net> writes:
> > (sort '(car window apple) #'string< :key #'symbol-name)
> Note that sort is advertised as a destructive function, and you pass
> it a quoted object.
Of course! I intended for my answer to be a template that could
be used in a destructive function. ;)
Zach Beane
> On 29 Nov 2005 04:08:54 -0800, "Kubilay" <kubil...@gmail.com> tried
> to confuse everyone with this message:
>
> >How can I sort symbols in alpahbetical order? I mean:
[snip]
>
> A simple combination of three built-in functions will do the job.
>
> (sort '(car window apple)
> (lambda (x y) (string< (symbol-name x) (symbol-name y))))
>
STRING< takes string designators, and symbols are string designators.
(sort (list 'foo 'bar 'baz) #'string<) => (BAR BAZ FOO)
Zach
Edi Weitz
> Good Lord! Was it so simple? How did you know the "sort" function?
> Did you already somehow learned it or did you looked at a reference?
Oh, you don't know /the/ reference? Here it is:
<http://www.lispworks.com/documentation/HyperSpec/Front/index.htm>
Note (we just had this) that this is not a tutorial or something like
that - don't expect to be able to learn CL from this alone - see
<http://www.lispworks.com/documentation/HyperSpec/Body/01_aa.htm>
> What should I do in such situations? Should I think in plain English
> and after that use "apropos"?
That's a good first step.
Cheers,
Edi.
--
Lisp is not dead, it just smells funny.
Real email: (replace (subseq "spam...@agharta.de" 5) "edi")
Zach Beane
> Good Lord! Was it so simple? How did you know the "sort" function? Did
> you already somehow learned it or did you looked at a reference? What
> should I do in such situations? Should I think in plain English and
> after that use "apropos"?
>
> I cannot always find great people like you to ask ;-)
Although it's not completely accurate any more, I found it helpful to
read Common Lisp, the Language, 2nd Ed, from cover to cover. Even if
not everything sticks perfectly in your mind, the next time you run
into a problem you may think "Oh yeah, I remember something about
this..."
Zach
Bulent Murtezaoglu
[...]
ZB> Although it's not completely accurate any more, I found it
ZB> helpful to read Common Lisp, the Language, 2nd Ed, from cover
ZB> to cover. [...]
I'll second this. Reading random sections helps too. I have the physical
book, but printing and comb binding etc. would also work. It is downladable.
Here's the cliki link: http://www.cliki.net/CLtL2
cheers,
BM