I'm not an expert but the JIT could keep all the lists as tuples until a modification is performed and then prevent further optimisation.
I don't know if current JITs are already doing this way. On 10 Sep 2014 23:42, "Jeremy Martin" <[email protected]> wrote: > Michal - Why have it only throw in strict mode? Tuples would be a new > construct, so no breaking of the web if it throws in all contexts. > > Jasper - It's not necessarily a given, but the immutability of tuples > offers some guarantees that are easier to optimize against. E.g., no need > to pre-allocate extra space, as in most array implementations. > > > On Wed, Sep 10, 2014 at 2:25 PM, Jasper St. Pierre <[email protected]> > wrote: > >> Why would tuples be any more memory efficient than objects or arrays? >> On 10 Sep 2014 11:57, "Michał Wadas" <[email protected]> wrote: >> >>> Should we have new type - tuples? >>> >>> My proposal: >>> - Tuples are immutable. >>> Eg. >>> var wow = new Tuple('my', 'little', 'Cthulhu'); >>> wow[2] = 'Nyarlathotep'; // throws in strict mode, silently fails in >>> sloppy mode >>> - Tuples are primitive type. Comparison between tuples is based on >>> identity of elements, not identity of tuples >>> Eg: >>> new Tuple(Object, Function, null, NaN) === new Tuple(Object, Function, >>> null, NaN); // true >>> - typeof new Tuple(); // 'tuple' >>> - Tuple(['wow', 'a', 'b']) = new Tuple('wow', 'a', 'b'); // true >>> - Tuple.prototype.add = function add() { >>> return new Tuple(...this, ...arguments); >>> } >>> >>> Pros: >>> - tuples are very memory efficient >>> - comparision based on identity of elements is required in many cases >>> Cons: >>> - ??? >>> _______________________________________________ >>> 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 >> >> > > > -- > Jeremy Martin > 661.312.3853 > http://devsmash.com > @jmar777 > > _______________________________________________ > es-discuss mailing list > [email protected] > https://mail.mozilla.org/listinfo/es-discuss > >
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