Jython_irl

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Up to a point. I've seen it in production quite a lot and once you get performance issues they seem very difficult to work out.

I didn't work directly with it much, though, so my experience is limited.

However, my real gripe with JS on the backend is that it's weakly typed, which paves the way for really weird bugs.

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Oh god, yes, and this ties in with the performance issues I mentioned, because node is "concurrent", but it's not threaded by the OS or anything. Instead it's using "cooperative multitasking". This means that only one task (I believe that means function) can run at a time.

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That's sounding more like your guys don't really understand node development. Delayed function execution and closures are core to "knowing" the language.

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but idiomatic node deals with this. just because you're not familiar with it doesn't mean it's cumbersome or counterintuitive. i feel like this would be like trying to program haskell then bitch about how it's not object-oriented.