The use of foo:bar in object literals and in JSON causes [[DefineOwnProperty]] behavior, not [[Put]] behavior. Making mustache's treatment of foo:bar inconsistent with object literals and with JSON is a worse footgun. If you always want mustache-with-[[Put]], use "=" rather than ":".
On Tue, May 29, 2012 at 9:33 AM, Tab Atkins Jr. <[email protected]>wrote: > 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 > _______________________________________________ > es-discuss mailing list > [email protected] > https://mail.mozilla.org/listinfo/es-discuss > -- Cheers, --MarkM
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