learning-v8

It's actually not exactly 50K, and likely varies across Chrome/V8 versions, operating system and/or machine architecture. On my browser the threshold is around 22500 elements. For a quick test, see [1]. The difference in V8 appears to be based on whether or not the array is stored in "large object space" [2], which seems to be used when the object is somewhere between 64kb and 128kb [3] (once again can depend on lots of factors). I wonder how many other optimizations depend on that? [1]: http://www.lonniebest.com/BadShiftPerformance/ [2]: https://issues.chromium.org/issues/42202676 [3]: https://github.com/danbev/learning-v8/blob/master/notes/heap...

The conversion is required to properly support indexing for any index != 0. Optimizations are only possible if iterator-style APIs are used so the runtime can iterate as well. However, it might be still more efficient to convert the whole string and be done with it, depending on its length. Languages with a proper WASM backend could offer optimized runtime libraries and/or optimize such code. The issue is not new. JavaScript runtimes frequently use multiple optimized string types for various situations: https://github.com/danbev/learning-v8/blob/master/notes/stri...

Question: How secure is chrome's V8 engine? Another question: Is there a consensus on weak points in V8 that can be mitigated on the client side? Background: I used no-script and other alternatives for about 10 years, but stopped around 2015 due to tedium and other malware mitigation strategies. I'm assuming tracking remains an issue. I'm unfamiliar with javascript engine internals but have found [0]. I've seen spectre based attacks and a few responses, primarily [1]. I've seen specific attacks [2]. Along the way I've found [3] and compared with [4]. These appear to be product based, as opposed to the Javascript engine specifically. I'm hoping for an overview of current attacks and V8's security and/or comparison with other client-side browser Javascript engines. A survey paper or link/blog would be great. ------------------------------ [