On Tue, May 29, 2012 at 9:26 AM, Nicholas C. Zakas
<[email protected]> wrote:
> Thanks for the clarifications. I understand wanting to make the distinction
> from an implementer point of view, I'm just not sure that developers make
> the distinction between [[Put]] and [[DefineOwnProperty]] even using regular
> object literals. Is there a reason that this:
>
> var obj = {};
> obj.{
> name: "JS"
> };
>
> Can't act the same as this:
>
> var obj = {};
> obj.name = "JS";
>
> Wherein, if the property is already defined that acts as [[Put]] and
> otherwise acts as [[DefineOwnProperty]]?
Same thoughts here. Regular devs (like me!) only see
[[DefineOwnProperty]] when creating a literal, and then there's no
observable distinction between these two in normal circumstances:
var obj = { foo: bar }
var obj = {};
obj.foo = bar;
I don't think it's worth optimizing for the [[DefineOwnProperty]]
case. We should just use the standard "foo:bar" syntax, and have it
invoke [[Put]] behavior.
As written, the strawman's attachment of the more natural "foo:bar"
syntax for [[DefineOwnProperty]] is a footgun.
~TJ
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