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IWETHEY Home / IWETHEY Board / Whither Scripting? Forum / Datastructure vs string
Post #133,314
by ben_tilly
1/2/04 7:55:09 PM
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New Datastructure vs string
'(foo bar) is a potentially complex data structure, while "(foo bar)" is a simple string.

It might be easier for you to understand if you translate it into another language. In Perl '(foo bar) would be written [$FOO, $BAR] (the capitals are to illustrate how Lisp is case-insensitive), while "(foo bar)" is the same in either language.

Does that make sense?

Ben
"good ideas and bad code build communities, the other three combinations do not"
- [link|http://archives.real-time.com/pipermail/cocoon-devel/2000-October/003023.html|Stefano Mazzocchi]
Post #134,198
by tablizer
1/8/04 12:17:28 AM
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New Okay, I think I got it.
I suppose it is a "Lisp structure", which is basically a "pointer" version of Lisp code. Is there a way to turn a string into such a structure?

BTW, is Emacs-Lisp considered a "decent" Lisp? Stripped-down Lisp?
________________
oop.ismad.com
Post #134,303
by ben_tilly
1/8/04 1:49:19 PM
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New More answers
To turn a string into a data structure you could use eval. You shouldn't have to do that very often though, because with macros and functions you can do what you might otherwise want to do with eval, and do it more cleanly.

As for eLisp, it is an older Lisp. It predates the acceptance of lexical scope, and so doesn't support things like closures. In my eyes that makes it a inferior, but YMMV.

Cheers,
Ben
"good ideas and bad code build communities, the other three combinations do not"
- [link|http://archives.real-time.com/pipermail/cocoon-devel/2000-October/003023.html|Stefano Mazzocchi]
     Emacs Lisp questions - (tablizer) - (16) - Dec. 13, 2003, 11:33:48 PM EST
         Write TAP - (deSitter) - Dec. 13, 2003, 11:43:10 PM EST
         Apostrophe-induced IFS! - (pwhysall) - (14) - Dec. 14, 2003, 04:17:45 AM EST
             I got yer apostraphe, swingin -NT - (boxley) - Dec. 14, 2003, 04:33:19 AM EST
             Your humor escapes me - (tablizer) - (12) - Dec. 17, 2003, 02:23:20 AM EST
                 Re: Your humor escapes me - (pwhysall) - (2) - Dec. 17, 2003, 02:57:56 AM EST
                     you seem bitter about something - (tablizer) - (1) - Dec. 22, 2003, 02:33:44 PM EST
                         He seems bitter? - (folkert) - Dec. 22, 2003, 02:41:18 PM EST
                 Peter's point is that you need to learn basic English - (ben_tilly) - (8) - Dec. 17, 2003, 11:22:40 AM EST
                     Besides, it's no good for a quick emacs hack - (Arkadiy) - (7) - Dec. 19, 2003, 10:30:41 AM EST
                         Answering the last question... - (ben_tilly) - (6) - Dec. 19, 2003, 10:55:38 AM EST
                             But isn't LISP the ideal language to rewrite LISP in? :-) -NT - (tablizer) - (5) - Dec. 22, 2003, 02:37:03 PM EST
                                 Yes, but it is still Lisp - (ben_tilly) - (4) - Dec. 24, 2003, 05:54:50 PM EST
                                     double quotes - (tablizer) - (3) - Jan. 2, 2004, 05:32:01 PM EST
                                         Datastructure vs string - (ben_tilly) - (2) - Jan. 2, 2004, 07:55:09 PM EST
                                             Okay, I think I got it. - (tablizer) - (1) - Jan. 8, 2004, 12:17:28 AM EST
                                                 More answers - (ben_tilly) - Jan. 8, 2004, 01:49:19 PM EST

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