Thread-topic: Changing AppleScript Records with Variable Identifiers
User-agent: Microsoft-Entourage/10.1.0.2418
On 7/4/05 2:30 PM, "Matt Neuburg" <email@hidden> wrote:
>> Date: Sat, 02 Jul 2005 14:38:40 -0700
>> From: Paul Berkowitz <email@hidden>
>> Subject: Re: Changing AppleScript Records with Variable Identifiers
>
>> NSDictionary
>> is precisely a "rigid" immutable data structure: it's much more rigid than
>> an AS record in that you can't change the value of keys.
>
> Ouch. There goes my bullshit meter, redlining again.
>
> NSMutableString* s =
> [NSMutableString stringWithString:@"howdy"];
> NSDictionary* d =
> [NSDictionary dictionaryWithObject:s forKey:@"greeting"];
> NSLog(@"%@",d); // {greeting = howdy; }
> [s setString: @"hello"];
> NSLog(@"%@",d); // {greeting = hello; }
>
> No "more rigid" than an AS record. m.
Sure it is. That's a trick answer that you've set up to get around the
limitations. If a dictionary's objects have all been defined to be mutable
in the first place and you change the value of an object to another value of
the same type without replacing the object, sure, OK. Not all types of
objects can be defined as mutable, however. Want to try changing an
NSNumber to another number? (Or to a string? Or to an application object?)
The equivalent of changing the value of a property in an AppleScript record
is setValue:forKey: in an NSMutableDictionary, which you cannot do in an
NSDictionary. That's what NSMutableDictionary is for. An AppleScript record
is somewhere between the two types (no equivalent of removeObjectForKey: or
setObject:forKey: although there are easy ways to redefine a record to do
those).
--
Paul Berkowitz
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