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> Also never use Math.pow for squaring numbers (used in the distance function) because it is significantly slower...

Modern JS engines optimize hot functions at runtime - advice like this won't affect actual performance.

This advice is incorrect. Experimenting in the console in both Firefox and Chrome shows that there's not a significant speed difference between the two, even if you make sure you only call a given function with integers <10000.

On my laptop it is about 30% slower (tested with Firefox 64). However I agree, this was not very good advice for someone who just started programming with JS...

Definitely great job. Reminds me of when I taught my physicist friend C and he wrote a raytracer and a game to demo it the next day. I had never witnessed so many trig functions used on a global context.

Does the JS JIT not handle this? Seems like it would be incredibly trivial...