What’s new in V8/JavaScript
summary
Covers concrete language features and engine work: optional chaining and nullish coalescing land in Chrome and change property access and defaulting semantics; WeakRefs plus FinalizationRegistry let event-listener leaks be collected (deref returns undefined once collected). V8 moves parsing off the main thread and parses while streaming, applies pointer compression to shrink object pointers, and ships V8 Lite optimizations; typical sites see ~40% memory drop from pointer compression and 10–30% from V8 Lite techniques.
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chapters (5)
- 0:00Start
- 1:52Optional Chaining: ?.
- 3:17Nullish Coalescing: ??
- 14:11Finalization Registry
- 22:09Memory reduction
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