JavaScript, HTML, CSS, HTTP, performance, security, Bash, Unicode, i18n, macOS.
Thanks for this great article! In the code just after “Let’s consider this concrete example,” should it say Object.preventExtensions(b)?
The story of a @v8js performance cliff in React
how are JavaScript values represented in memory?
what are shape migrations & deprecations?
how do Object.{preventExtensions,seal,freeze} work?
https://v8.dev/blog/react-cliff …pic.twitter.com/XhiBxRLIBu
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So, I'm curious regarding that last bit - what are the alternatives to the (maybe/likely/soon/...?) deprecated shape migrations that V8 is looking into?
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Basically it's to just do in-place transitions, defining field types as a lattice where each transition only increases the set of valid types (e.g. rather than Smi -> Double, have Smi -> DoubleOrSmi). Here's the design:https://docs.google.com/document/d/1VeKIskAakxQFnUBNkhBmVswgR7Vk6T1kAyKRLhqerb4/edit?usp=sharing …
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Great post! Regarding the last advice about `null`, does it also apply for `undefined`? If the variable is initialized to `undefined` and then received an Smi, does v8 consider it an Smi?
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Nice article! I've always heard that typeof null was a bug in OG netscape, not a design choice. I wonder if anyone would know for sure.
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this guy would know:
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YEEEAAAGH!!!Hvala. Twitter će to iskoristiti za poboljšanje vaše vremenske crte. PoništiPoništi
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Would it be interesting to have trace events for this kind of deoptimization/slow path?
Hvala. Twitter će to iskoristiti za poboljšanje vaše vremenske crte. PoništiPoništi
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Čini se da učitavanje traje već neko vrijeme.
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