transfering a tekststing to an variable
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transfering a tekststing to an variable

 
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Marcel Janmaat
Guest
Posted: Tue Jan 04, 2005 7:44 pm    Post subject: transfering a tekststing to an variable Reply with quote
Hello there,

Maby I 'm being foolish here, but...

If I have

(setq a '("variable" "1" "This is a variable"))

How can I transfer "variable" to variable like

(setq variable ; meaning (car a) transferd to variable
(cadr a)
)

Regards M

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Tom Smith
Guest
Posted: Tue Jan 04, 2005 7:58 pm    Post subject: Re: transfering a tekststing to an variable Reply with quote
(set (read (car a)) (cadr a))
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Marcel Janmaat
Guest
Posted: Tue Jan 04, 2005 8:53 pm    Post subject: Re: transfering a tekststing to an variable Reply with quote
Thanx! That was easy! Never had to use read before.

"Tom Smith" <nospam> schreef in bericht news:41daaec5_3@newsprd01...
Quote:
(set (read (car a)) (cadr a))



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Tom Smith
Guest
Posted: Tue Jan 04, 2005 9:45 pm    Post subject: Re: transfering a tekststing to an variable Reply with quote
read is useful when you need to create a symbol name, as in a case like
this.

Also note the set instead of setq. Setq is a contraction of "set quote"
where the first argument is ro be taken literally (quoted) as in (setq
variable 1) which is the same as (set (quote variable) 1) or (set 'variable
1).

But in your case the first argument was something that needed to be
evaluated -- (read (car a)) -- so you don't want to suppress evaluation by
quoting it.
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