[gbuk2013]

IIRC V8 actually does some tricks under the hood to avoid malocs which is why Node.js can be be unexpectedly fast (I saw some benchmarks where it was only 4x of equivalent C code) - for example it recycles objects of the same shape (which is why it is beneficial not to modify object structure in hot code paths).

[yencabulator]

JITs are a great magic trick but it's nowhere near guaranteed you'll get good steady performance out of one, especially when the workload is wide not narrow.

https://arxiv.org/abs/1602.00602v1

[hinkley]

Hidden classes is a whoooole thing. I’ve switched several projects to Maps for lookup tables so as not to poke that bear. Storage is the unhappy path for this.