On Aug 27, 2013, at 9:43 AM, Allen Wirfs-Brock wrote: > > On Aug 27, 2013, at 9:26 AM, Domenic Denicola wrote: > >> I am not aware of all the nuances of the discussion, but as a developer I >> would find the behavior for numeric expandos confusing. For a typed array of >> length 1024, setting `ta[1023]` would do something completely different from >> setting `ta[1024]`. Unlike normal arrays, setting `ta[1024]` would not >> change `ta.length`, and presumably `ta[1024]` would not be exposed by the >> various iteration facilities. >> >> I would much rather received a loud error (in strict mode), which will >> either alert me to my code being weird, or possibly to my code committing an >> off-by-one error. > > Integer numeric expandos on TypedArrays (eg, outside the range 0..length-1) > are disallowed by the ES6 spec. in a manner that is independent of > the[[Extensible]] internal property. The discussion at the meeting was about > non-numeric expandos such as 'foo'.
To clarify, out of range [[Get]] returns undefined and out of range [[Put]] is either a noop or a throw depending upon the strictness of code doing the [[Put]] (ie, normal [[Put]] strict behavior) > > Allen > > > _______________________________________________ > es-discuss mailing list > [email protected] > https://mail.mozilla.org/listinfo/es-discuss > _______________________________________________ es-discuss mailing list [email protected] https://mail.mozilla.org/listinfo/es-discuss
