Re: Non Compulsory Parameters & a Null Constant?
Re: Non Compulsory Parameters & a Null Constant?
- Subject: Re: Non Compulsory Parameters & a Null Constant?
- From: julifos <email@hidden>
- Date: Wed, 12 Feb 2003 10:59:48 +0100
>
hi all.
>
>
couple of basic queries.
>
>
is there a way to specify parameters in a handler that are not compulsory in
>
a call to that handler.
You can define a global variable and forget parameters in your handler. Eg.
####################
global x
set x to false --> default value for x
--> some condition can modify x's value
if weekday of (current date) is Wednesday then set x to true
doStuff()
to doStuff()
if x then beep
end doStuff
####################
>
Some what related other question.
>
>
Is there a constant along the lines of NULL or VOID from other languages
>
>
My desire for this is to determine if a variable already exists.
There are some constants such as "null" or "missing value", but these are
only equal to theirselves. To check for a variable which does not exists,
you can handle an error:
####################
try
bar
set bar_is_defined to true
on error --> bar undefined
set bar_is_defined to false
end
####################
JJ
Yahoo! Shopping - Send Flowers for Valentine's Day
http://shopping.yahoo.com
_______________________________________________
applescript-users mailing list | email@hidden
Help/Unsubscribe/Archives:
http://www.lists.apple.com/mailman/listinfo/applescript-users
Do not post admin requests to the list. They will be ignored.