Attribute defaults for Object.defineProperty

Jeff Watkins watkins at apple.com
Thu Aug 21 21:52:38 PDT 2008


What about Fixed: neither its existence nor its type may be changed?

Although I'd prefer to control Deletable separately from Fixed,  
because I'd love to see a delete added to get and set for properties.

On 21 Aug, 2008, at 7:37 AM, Neil Mix wrote:

> writable: can be written to
> enumerable: can be enumerated
> flexible: can be flexed?
>
> how about configurable?
>
> On Aug 20, 2008, at 5:31 PM, Allen Wirfs-Brock wrote:
>
>>> From: Brendan Eich [mailto:brendan at mozilla.org]
>>> Sent: Wednesday, August 20, 2008 11:25 AM
>> [snip]
>>>
>>> Hi Allen, could you remind me and a few others who were wondering
>>> yesterday (sorry I don't remember -- it's in minutes, somewhere) why
>>> [[Deletable]] was not chosen instead of [[Flexible]]? Thanks.
>>
>>
>> The reason for not using "deletable" was originally explained in the
>> message below.  I believe that at one of the phone meetings after
>> Oslo we briefly discussed changing it back to "dynamic" or possibly
>> something else but the consensus was to stick with "flexible".
>>
>>> -----Original Message-----
>>> From: es3.x-discuss-bounces at mozilla.org [mailto:es3.x-discuss-
>>> bounces at mozilla.org] On Behalf Of Allen Wirfs-Brock
>>> Sent: Thursday, June 26, 2008 1:39 PM
>>> To: es3.x-discuss at mozilla.org x-discuss; es4-discuss at mozilla.org  
>>> es4-
>>> discuss
>>> Subject: RE: "dynamic" attribute nomenclature
>>>
>>> At today's ES 3.1 conference call (see
>>> http://wiki.ecmascript.org/doku.php?id=meetings:minutes_jun_24_2008)
>>> we agreed to use the term "Flexible" for the property attribute that
>>> we recently had been calling "Dynamic" and which subsumes the
>>> DontDelete attribute.
>>>
>>> From: Allen Wirfs-Brock
>>> Sent: Wednesday, June 25, 2008 10:37 AM
>>> To: Lars Hansen; Mark S. Miller
>>> Cc: es3.x-discuss at mozilla.org x-discuss
>>> Subject: "dynamic" attribute nomenclature
>>>
>>> In Lars's feedback on the the June 11, ES3.1 draft he said:
>>>
>>> p26 8.6.1.  (And throughout the spec) The meaning of "dynamic" in  
>>> ES4
>>> is something else (it means a non-fixture property).  It would
>>> probably
>>> reduce confusion if the property name Deletable were used here, as I
>>> though we had agreed previously.
>>>
>>> Dynamic as currently used in ES3.1 means more than just Deletable,  
>>> it
>>> also means that the property attributes (including the Dynamic
>>> attribute) can be modified and that it can be transformed  between
>>> being a data and procedural property. Hence, the name Deletable  
>>> seems
>>> to imply something too narrow.
>>>
>>> Playing around with the thesaurus, the best "positive, active term
>>> that
>>> I could find that seems to be a reasonable description of this
>>> semantics is:
>>>     Alterable
>>>
>>> (other, perhaps less satisfy or otherwise unacceptable alternatives
>>> include: changeable, mutable, modifiable, flexible, amendable)
>>>
>>> Note this would mean  that data properties would expose properties
>>> named Writable and Alterable.  My sense is that there is enough
>>> conceptual  distance between those terms that there won't be too  
>>> much
>>> confusion.
>>>
>>> Thoughts??
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