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Title: Strange function symbol?
Post by: HPW on November 23, 2003, 10:15:02 AM

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newLISP v7.3.8 Copyright (c) 2003 Lutz Mueller. All rights reserved.

> (set (symbol "var") 345)
345
> (symbol? var)
nil
>

Why does it return nil?

Title:
Post by: Lutz on November 23, 2003, 11:31:28 AM

the function 'symbol?' evaluates its argument first, the contents of var was not a symbol but 345:

(set 'x 'var) = > var

(symbol? x) => true ;; checks the contents of x which is the symbol var

(symbol? (first '(var x y z))) => true

etc.

Lutz

Title:
Post by: HPW on November 23, 2003, 01:02:20 PM

Oops, thanks for the explanation.

Title:
Post by: HPW on November 23, 2003, 02:25:33 PM

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(set 'var any-thing)
(symbol? any-thing)     => true

The doc is not that clear.

Title:
Post by: Lutz on November 23, 2003, 02:50:29 PM

the doc is wrong ;-)

I'll correct this

Lutz

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Forum => newLISP in the real world => Topic started by: HPW on November 23, 2003, 10:15:02 AM