Le 8 oct. 2013 à 07:21, Allen Wirfs-Brock <al...@wirfs-brock.com> a écrit :
> > On Oct 7, 2013, at 8:05 PM, Nathan Wall wrote: > >> >> Set foo to bar.[[Baz]] >> >> Does `foo` ever result in a non-undefined value if `bar` doesn't have an own >> `[[Baz]]` property but inherits from an object that has an internal >> `[[Baz]]` property? >> > > I couldn't say, as this notation is never used in the ES specification. > Hence it means whatever the person who wrote it wants it to mean. It may be useful to recall that there are different concepts in the spec that have a name enclosed in double square brackets. I have found these three: * attributes of object properties (Section 6.1.7.1) [1]; * internal methods and internal data properties of objects (Section 6.1.7.2) [2]; * fields of records (Section 6.2.2) [3]. Among those concepts, the notation `O.[[X]]` is defined (and, I presume, used) only for fields of records. But there is some risk for the reader to accidentally extend this notation to internal data properties of objects. —Claude [1] http://people.mozilla.org/~jorendorff/es6-draft.html#sec-property-attributes [2] http://people.mozilla.org/~jorendorff/es6-draft.html#sec-object-internal-methods-and-internal-data-properties [3] http://people.mozilla.org/~jorendorff/es6-draft.html#sec-list-and-record-specification-type > > Allen > > > _______________________________________________ > es-discuss mailing list > es-discuss@mozilla.org > https://mail.mozilla.org/listinfo/es-discuss
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