V8 Internals for JS Developers
summary
V8 exposes about twenty distinct elements kinds and the talk shows how arrays transition irreversibly from specific (SMI) to general (double, object) formats, and from packed to hole arrays which costs extra prototype lookups. Practical tests use the d8 debug binary and internal %-prefixed helpers — e.g. use d8 and %DebugPrint to inspect an array’s elements kind. Concrete advice: avoid creating holes, normalize -0/NaN/Infinity, prefer typed arrays or push-filled literals for best numeric performance.
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