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by spankalee 83 days ago
Hidden class optimizations just make JavaScript objects behave a little more like Java class instances, where the VM knows where to find each field, rather than having to look it up like a map.

It doesn't make JS faster than Java, it makes it almost as fast in some cases.
1 comments
kykat 83 days ago
I can only say what I observed in testing, and that's that having millions of instances of a class like Point3D{x, y, z} in JS uses significantly less memory than in Java (this was tested on Android, not sure if relevant). It was quite some time ago so I don't remember the details.
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gf000 83 days ago
Well, Android is not running Java, it runs Android runtime (dalvik) byte code. In general, depending on when it was, that runtime is much much simpler and does a lot more at compile time at the expense of less JIT optimization.

It's also many versions behind the Java API (depending on when it happened).

So your data point is basically completely irrelevant.

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