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I know ocaml has a lot of proponents in industry (jane street probably the most vocal, but I've seen it many other places, as well). Most of the SML/MLTon references I come across seem to be in an academic and research context. Is anyone out there using it for "real world" application development? What sorts of niches would it serve well?

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I once prototyped an acoustic ray-tracer in MLTon, and it was a pleasure to work in.

I have no idea how close I could have gotten to C/C++ -level performance, but I found debugging the prototype to go way faster in MLTon than it likely would have gone in C/C++.

Unrelated, but...

Acoustic ray-tracer? That sounds like fun. Is there anywhere I can learn more?

Here's one place: http://oalib.hlsresearch.com/Rays/

If you want to actually understand it, this book is pretty good IIRC: https://www.amazon.com/Computational-Acoustics-Modern-Signal...

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