Subj : Re: Setter and Getter inherited from a prototype
To   : =?ISO-8859-1?Q?Georg_Maa=DF?= <georg@bioshop.de>
From : Brendan Eich <brendan@meer.net>
Date : Mon Mar 17 2003 07:37 pm

Georg Maaß wrote:

> If my object "A" inherits a getter or setter for property "a" from the 
> prototype "B", assigning a value to this property does not really 
> replace the inherited behaviour by a own property of object "A". The 
> inherited getters and and setters on this property remain active. 


This is a bug, I'm surprised no one complained sooner.  Sorry abou that 
-- it's filed as http://buttmonkey/bmo/show_bug.cgi?id=197940, and I'll 
fix it soon for 1.4a.

> This is an unexpected behaviour. Is this intented? How can I throw 
> away such inherited setters and getters? I tried the delete operator, 
> but this was useless. The inherited getter is still active.


You can't delete.  If you need a workaround, save the delegating 
object's __proto__, set that property to null, override the prototype 
property, then restore __proto__.

/be

>
>
>
> js> function A(){}
> js> function B(){this.__defineGetter__('a',function(){return false;})}
> js> A.prototype=new B;
> [object Object]
> js> a=new A;
> [object Object]
> js> a.a=6;
> 5: TypeError: setting a property that has only a getter
> js> delete a.a;
> true
> js> a.a=6;
> 7: TypeError: setting a property that has only a getter
> js> a.a
> false
> js>
>                           js> a.hasOwnProperty('a');
> true
>
>
>
>

.