On Mar 11, 2008, at 2:45 PM, Brendan Eich wrote:
> Proposal: Add Object.prototype.__makePropertyNonEnumerable__(name),
> defined as if by:
>
> Object.prototype.__makePropertyNonEnumerable__ = function
> (name) {
> if (this has a direct property identified by name) {
> set the DontEnum attribute for this[name];
> return true;
> }
> return false;
> }
Important missing statement after this one (I was getting on a plane
and realized it was omitted just after shutting down :-/):
Object.prototype.__makePropertyNonEnumerable__
('__makePropertyNonEnumerable__');
In ES4 terms, the spec would look like this (including reversion of
propertyIsEnumerable to ES3 form):
Obvious changes to "Synopsis" left as exercise for reader ;-).
Under "Methods on Object instances":
intrinsic function propertyIsEnumerable(name: EnumerableId): boolean
private::propertyIsEnumerable(name);
private function propertyIsEnumerable(name) {
if (!magic::hasOwnProperty(this, name))
return false;
return !magic::getPropertyIsDontEnum(this, name);
}
intrinsic function __makePropertyNonEnumerable__(name: EnumerableId):
boolean
private::__makePropertyNonEnumerable__(name);
private function __makePropertyNonEnumerable__(name) {
if (!magic::hasOwnProperty(this, name))
return false;
magic::setPropertyIsDontEnum(this, name, true);
return true;
}
Under "Methods on the Object prototype object":
prototype function propertyIsEnumerable(name)
this.private::propertyIsEnumerable(helper::toEnumerableId(name));
prototype function __makePropertyNonEnumerable__(name)
this.private::__makePropertyNonEnumerable__(name);
/be
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