Re: a question about accessing list items through a reference
Re: a question about accessing list items through a reference
- Subject: Re: a question about accessing list items through a reference
- From: Tetsuro KURITA <email@hidden>
- Date: Thu, 31 May 2007 13:41:16 +0900
I could resolve my problem by myself.I looks that nobody is interested in
myproblem. But I will introduce my experience, because someone will meet
sameproblem. Also even now I have unsolved questions. Therefore I hope
authority's comments.
A reference to an item of a list may usually appear in a loop of "repeat with ~ in ~" statement as follows.
(* Script A *)
property a_list : {1, 2}
repeat with ref_to_item in a_list
set contents of ref_to_item to 3
end repeat
Above script works well. But very slow. As well known, to accelerate
loop,items of AppleScirpt's list must be accessed through a reference to a
list or script object as follows.
(* Script B *)
property a_list : {1, 2}
repeat with ref_to_item in my a_list
set contents of ref_to_item to 3 -- error of number -10006
end repeat
But this script does not work. Someone says I can drop "my" before "a_list".
But we need "my" in the point of view of the performance, and it should be
considered that the list is in the other script object in some cases.
Accidentally I found the following scripts works well.
(* Script C *)
property a_list : {1, 2}
repeat with ref_to_item in (a reference to my a_list)
set contents of ref_to_item to 3
end repeat
I could have obtained what I wanted. But I could not understood what happen.
Why does not "Script B" works ?
Why does "Script C" works ?
> I found a strange behavior when accessing list items.
>
> The following code works.
>
> property a_list : {1, 2}
> set a_ref to a reference to item 1 of a_list
> set contents of a_ref to 3
>
> But following code does not works with error of number -10006.
>
> property a_list : {1, 2}
> set a_ref to a reference to item 1 of my a_list
> set contents of a_ref to 3
>
> Is it a bug ?
=======================================================
Tetsuro KURITA
E-mail: email@hidden
http://homepage.mac.com/tkurita/scriptfactory/en/
=======================================================
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