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but if it comes at a 10x productivity boost it's worth it.

So where exactly does the "10x productivity boost" come from in this case?

It's the same C and/or C++ code being compiled in both cases. It doesn't become any easier to write said code, just because it's compiled down to a mangled form of JavaScript rather than a native binary.

I'm not sure if this is what rtpg was referring to, but... In this case, the 10x productivity would come from suddenly being able to use C/C++/other code that can be compiled to asm.js, which was previously not useful for client-side web apps unless you rewrote it by hand into JavaScript.

he might e thinking of writing another language, which he's comfortable with, vs javascript - for portability

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