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Recently, React core hit a scary V8 performance cliff.
Here’s a technical deep dive explaining what happened behind the scenes in V8, and how we fixed it!
https://v8.dev/blog/react-cliff …pic.twitter.com/iq4CVCKRLF
Quick comments: 1. Can’t say “thought” so much as “abstraction leak” was behind ‘typeof null’ :-/. 2. -1*0 === -0 but 0 === -0 too per IEEE754 recommendation. Testing for -0 requires more work e.g. 1/-0 === -Infinity. 3. Did hidden class get renamed “shape”? SpiderMonkey term.pic.twitter.com/vruSOVL0YZ
1. I remember DM'ing you to confirm before our presentation (thanks again)! 2. We covered this: https://www.youtube.com/watch?v=0I0d8LkDqyc&t=28m20s … but decided to omit this side note from the article. Also, http://Object.is ftw! 3. V8 still calls them "maps", but "shapes" is the clearest term IMHO.
You've written your component as class.
Does this also happen with functional components? 
tis not a component
Awesome article. In the section describing ways of forcing field initialization to be a Float, maybe it would be worth calling out that some forms get destroyed by minifiers? e.g. Terser converts 0.0 to 0
0.0 wouldn’t help, as that’s still 0 which is a Smi. (We *could* add a special case to our parser of course, but that likely wouldn’t help much for the reasons you outlined.)
I love these in depth peeks into the engine. Thanks!
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