initialize an static, local, script-wide variable to empty

erik hansen erikhans08 at yahoo.com
Sun Apr 13 00:12:01 CDT 2003



Richard Gaskin <ambassador at fourthworld.com> wrote:


>> I tend to use them in two circumstances:
>> 
>> - where I might have used globals but want to
>> avoid name-space collisions
>> (great for utilities and plugins where you have
>> no control over the name space)
> 
> "name space" is a new expression for me. ???

It's geekspeak for "the range of all possible names".

> after all this, i am back to declaring
> temporary/in-handler locals. a trade off
> between extra text versus having all variables
> declared at the beginning of each handler.
> using handler + parameters to pass info
> involves the same kind of trade off.

When you get the hang of using script-local vars, they serve a different
olace from globals and parameters, and are useful in their own right, worth
becoming familiar with.

If you've been declaring them with "global" I can understand the confusion,
as theyt would then act as common local vars (the "global" declaration is
ignored outside of handlers).


> using the script/static approach generated
> some very strange results:
> 
> local sHolder = empty # no quotes
> put the actual "e-m-p-t-y" string into sHolder
> in the first handler that ran
> the only instance i have ever seen where empty
> did not resolve to just that.

If you post the actual code we can identify the problem.

> there was a loop where:
> 
> local i # outside any handlers
> on xxx
> repeat with i = 14 to 18
> # on the first pass (i = 14) fine,
> # on the second pass (i = 5)
> put goGetum() after sHolder
> end repeat
> end xxx
> 
> function goGetum
> repeat with i = 1 to 5
> doSomething
> end repeat
> end goGetum 
> 
> this is the only case in my experience where
> repeat with i = 
> did not follow orders

This may be a case of the propgram doing what you told it rather than what
you intended. :)

In the first loop, you initialize i to contain 14, but then in its repeat
loop you cann another handler which uses the same variable to count from 1
to 5, so when it returns i contains the last value set: 5.

> take home thought:
> use script/static locals very carefully

Or maybe the take home thought is simply:
If you need two different repeat loops to count independently, you two
different variables as the counter.

-- 
Richard Gaskin 
Fourth World Media Corporation
Developer of WebMerge 2.2: Publish any database on any site
___________________________________________________________
Ambassador at FourthWorld.com http://www.FourthWorld.com
Tel: 323-225-3717 AIM: FourthWorldInc

_______________________________________________
use-revolution mailing list
use-revolution at lists.runrev.com
http://lists.runrev.com/mailman/listinfo/use-revolution

erik at erikhansen.org    http://www.erikhansen.org


---------------------------------
Do you Yahoo!?
Yahoo! Tax Center - File online, calculators, forms, and more
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.runrev.com/pipermail/use-livecode/attachments/20030413/9c2f9d8f/attachment.html>


More information about the use-livecode mailing list