fwiw, tests for enumeration order now in compat table — https://github.com/kangax/compat-table/commit/a267f2233ce3b25dfbee876f4a4786ad85b31049
Results — https://kangax.github.io/compat-table/es6/#own_property_order -- kangax On Thu, Apr 16, 2015 at 8:37 PM, Brendan Eich <bren...@mozilla.org> wrote: > Also, it's too late. Engines are converging, inter-operation pressure > points in one direction only: greater convergence and standardization. > > It's true engines are not converging on the ancient insertion order, and > that caused some interop stress, but we are over that hump now. See > https://code.google.com/p/v8/issues/detail?id=164&can=1&q=enumeration&colspec=ID%20Type%20Status%20Priority%20Owner%20Summary%20HW%20OS%20Area%20Stars > (a long, and long-resolved, V8 issue). > > Bergi's frustration is understandable. Leaving things unspecified for too > long was a failure on our part in tending the spec, or a trade-off (we had > other things to do ;-). All water under the bridge, but we're not stepping > back to unspecified behavior. Because engines aren't, because developers do > not want. > > And agree with Mark: POITROAE. > > /be > > Mark S. Miller wrote: > >> Developer productivity > hypothetical minor performance gains. >> >> +1 to all steps to make the specified behavior more deterministic, >> including this one. >> >> >> On Thu, Apr 16, 2015 at 10:07 AM, liorean <lior...@gmail.com <mailto: >> lior...@gmail.com>> wrote: >> >> I'm very much opposed to locking this down for general objects because >> it locks the implementation choices for generic objects down. What if >> the engine backing implementation was, say, some variation of a trie >> for instance? It cannot really be done today without adding extraneous >> data into the structure, because lookup in that case happens on a >> character by character basis, not on a whole string basis, so >> properties that use common prefixes would always end up adjacent and >> even if the keys weren't inserted in order by bit patterns into the >> trie as most implementations do, they would still be grouped by common >> prefix. >> -- >> David "liorean" Andersson >> _______________________________________________ >> es-discuss mailing list >> es-discuss@mozilla.org <mailto:es-discuss@mozilla.org> >> https://mail.mozilla.org/listinfo/es-discuss >> >> >> >> >> -- >> Cheers, >> --MarkM >> _______________________________________________ >> es-discuss mailing list >> es-discuss@mozilla.org >> https://mail.mozilla.org/listinfo/es-discuss >> > _______________________________________________ > es-discuss mailing list > es-discuss@mozilla.org > https://mail.mozilla.org/listinfo/es-discuss >
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