You know... It's in fact much more like the reverse: compiling assembly language into C. Java is a less expressive language than JavaScript. The result is that you code in the slow-to-develop/fast-to-run language and it spits out fast-to-develop/slow-to-run code.
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Actually, my first thought when reading this blog post was "oh no, it's C vs. hand-tunes assembly again." We know, how that ended up.
You know... It's in fact much more like the reverse: compiling assembly language into C. Java is a less expressive language than JavaScript. The result is that you code in the slow-to-develop/fast-to-run language and it spits out fast-to-develop/slow-to-run code.