Re: Null
Re: Null
- Subject: Re: Null
- From: Christopher Nebel <email@hidden>
- Date: Thu, 9 Jan 2003 11:40:02 -0800
On Thursday, January 9, 2003, at 12:47 AM, Gary Lists wrote:
On or about 1/8/03 3:50 PM, Christopher Nebel wrote:
The upshot of this is that "null" is indeed a defined identifier in
AppleScript, but I don't think it means anything useful -- there's no
implementation behind it. "missing value" is the thing to use in
scripts.
To help me (and others...?) get things straight, I've seen some
scripts (Paul B, I think) that use something like:
property myvar : missing value
In what way should we be using that as an initial value, and what is
the logical operator for comparison of that variable?
if myvar = missing value -- this?
Yep, that's the correct form. Such a script is just using "missing
value" as a distinctive value to indicate that the property hasn't been
properly filled in yet. Using "missing value" this way is nice because
it's self-documenting, but it's not intrinsically better than, say, an
empty string or an empty list.
--Chris Nebel
AppleScript Engineering
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| | >Re: Null (From: Gary Lists <email@hidden>) |