 | | Re: [Flashcoders] this.onEnterFrame=undefined or delete
this.onEnterFrame | Re: [Flashcoders] this.onEnterFrame=undefined or delete
this.onEnterFrame 2004-03-14 - By FODOR
Back
The only difference I see is -beside the speed- the same difference between
1000 mcs/vars/or anything set to undefined and the "absence" of reference to
these objects.
(15/03/04 2:39) Keith Peters wrote:
> I still think there is no difference.
> As far as I know, undefined is undefined is undefined.
> Can anyone demonstrate any difference between a variable that doesn't
> exist, one that has been deleted, and one that has been assigned
> undefined?
>
> y = 10;
> delete y;
> z = undefined;
> trace(x);
> trace(y);
> trace(z);
> trace(typeof x);
> trace(typeof y);
> trace(typeof z);
>
> Undefined is not a string or number or other type. It is the type
> undefined, which has one possible value: undefined.
> Something that is undefined == something else that is undefined. Just as
> 1 always equals 1, whether it's 1, 0+1, or 2-1, undefined will always
> equal undefined no matter how it becomes undefined.
>
> -- --Original Message-- --
> From: Morten Barklund [mailto:morten.barklund@(protected)]
> Sent: Sunday, March 14, 2004 8:25 AM
> To: flashcoders@(protected)
> Subject: RE: [Flashcoders] this.onEnterFrame=undefined or delete
> this.onEnterFrame
>
>
>> Because setting to undefinied, it still gets resources... ?
>
> That depends on the event model.
>
> If it for all movieclips checks if the onEnterFrame property has type
> function before calling it, then it will use the same amount of
> resources, as a check directly on the movieclip resolving to undefined
> is as fast as a check on the movieclip moving up the
> inheritance/prototype chain, to see if it exists here before figuring
> out, it resolves to undefined.
>
> Actually, I remember some other time this discussion was up, some
> believed that these steps up the prototype chain in stead of resolving
> it directly on the object would consume a few extra resources and thus
> setting to undefined was faster. But I've always deleted - I think it is
> a matter of preference...
>
> // Morten Barklund
> // DKMMUG Manager
>
>
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