We just tripped over
('foo' is String) == false in swf8 but true in swf9
On Tue, Sep 16, 2008 at 11:32 AM, André Bargull <[EMAIL PROTECTED]>wrote:
> I've tripped over that 'feature' while updating the music example
> application to show some ID3 infos.
> First I've tested "if (id3 != null)", that worked perfectly under swf9, but
> it was ´false´ under swf8. Let's say, I was a bit stumped at that time. Then
> I tested all these variations to find out what is so magic about the
> id3-object in swf8. At least "if (!! id3)" works in both runtimes. :-)
>
>
> On 9/16/2008 4:54 PM, P T Withington wrote:
>
>> Flash is not very good about their built-in objects behaving as objects.
>>
>> Adam used to use something like this to test for an object being a
>> function:
>>
>> if (x == null && (! x)) ...
>>
>> So, functions are similar to null and false in a boolean context, so this
>> might be part of that old hack?
>>
>> On 2008-09-16, at 10:38EDT, André Bargull wrote:
>>
>> Some Flash8 built-in objects are too scary:
>>>
>>> var id3 = audioplayer.getID3(); //audioplayer is a LzView
>>> typeof id3; // 'object'
>>> typeof id3.constructor; // 'undefined' -> aha, a built-in object
>>> id3 == null; // true
>>> id3 == undefined; // true
>>> id3 != null; // false
>>> id3 != undefined; // false
>>> id3 === null; // false
>>> id3 === undefined; // false
>>> id3 !== null; // true
>>> id3 !== undefined; // true
>>> Finally: !!(audioplayer.getID3()); // true
>>>
>>> Whatever their indention was....!?
>>>
>>
>>
>>
>
--
Henry Minsky
Software Architect
[EMAIL PROTECTED]
