What are the performance characteristics and memory footprint one can expect from Map & Set?
I would like to point out that a lot of built-in features that V8 and other JS VMs implement (e.g. Array.prototype.forEach) are never used because they are perceived as slow (and they are actually slow for various reasons). Can we proactively avoid falling down the same hole with ES6 features? What about having ES6 features (micro)benchmark suite to drive performance of this features across all browsers implementing them? Vyacheslav Egorov On Tue, May 6, 2014 at 9:22 PM, 'Erik Arvidsson' via v8-users < v8-users@googlegroups.com> wrote: > Map & Set are both part of ES6 [1], [2]. > > They are shipping in Firefox since version 13 [3] and Internet Explorer 11 > [4]. They are also turned on by default for nightly WebKit/JSC. > > Adam Klein recently re-implemented the backing hash table used by both Map > and Set to use an ordered hash table, which is a requirement for > deterministic insertion order iteration. With that we were able to add > support for forEach which we saw as a must have for parity with Firefox and > Internet Explorer. > > This is not a full implementation of Map and Set. Most notably it does not > include @iterator, entries, values nor keys. This is also the lowest common > denominator between IE and FF. We plan to send out further intent to ship > emails before we ship the remaining features of Map and Set. > > Owners: ad...@chromium.org, a...@chromium.org > > [1] http://people.mozilla.org/~jorendorff/es6-draft.html#sec-map-objects > [2] http://people.mozilla.org/~jorendorff/es6-draft.html#sec-set-objects > [3] https://developer.mozilla.org/en-US/Firefox/Releases/13 > [4] http://msdn.microsoft.com/en-us/library/ie/dn342892(v=vs.85).aspx > > -- > -- > v8-users mailing list > v8-users@googlegroups.com > http://groups.google.com/group/v8-users > --- > You received this message because you are subscribed to the Google Groups > "v8-users" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to v8-users+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. > -- -- v8-users mailing list v8-users@googlegroups.com http://groups.google.com/group/v8-users --- You received this message because you are subscribed to the Google Groups "v8-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to v8-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
