Re: Null
Re: Null
- Subject: Re: Null
- From: julifos <email@hidden>
- Date: Tue, 07 Jan 2003 10:57:40 +0100
>
email@hidden (Chris Espinosa) wrote:
>
>
> If you want to override this (e.g. you want to check to see whether a
>
> variable has been initialized), use "missing value". There is no globally
>
> defined "null" in AppleScript (though some scripting additions and
>
> applications define one).
>
>
email@hidden (Christopher Nebel) wrote:
>
>
> Actually, there is -- it's define in the Type Names suite:
>
>
>
> "null", typeNull, "", { }, { },
>
>
Thank you both for your answers. I've been scripting for many years and I only
>
discovered 'missing value' recently when looking at AppleScript Studio
>
examples.
>
Is it more recent? When were 'null' and 'missing value' introduced in
>
AppleScript? Do I need to worry about that for my users who have older
>
versions
>
of the OS?
>
>
Steve
Mmm... "missing value" was not at AS 1.1 ("null" yes), but it is at language
guide (AS 1.3.7/MacOS 8.6). Also, I can't see it listed at AS 1.3.4 (MacOS
8.5), at least as 'class msng'...
JJ
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