Slides for my #jsconfau18 presentation on @v8js internals for JavaScript developers: https://slidr.io/mathiasbynens/v8-internals-for-javascript-developers …pic.twitter.com/elyFdi5NNt
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Going holey is not the end of the world. We can still optimize holey array operations! But they’re inherently less efficient than packed arrays.
The spec doesn't explain the performance difference of operations of arrays constructed with x=new Array(1); x[0]=1; vs x=[1] That's not obvious (not idiomatic?) to the user. It's a V8 detail that array don't convert back.
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