I agree with your point in that this is written in an excessively functional style. Something more akin to the imperative-style solution given by lifthrasiir be

I agree with your point in that this is written in an excessively functional style. Something more akin to the imperative-style solution given by lifthrasiir below might have been simpler. However, I don't think that code shows that Rust is more expressive in any way than C/Go is (which is kind of the point). The functional code I give in the article is quite radically different from what you would/could do in those languages, and I would argue that it does show that Rust provides some interesting and flexible mechanisms that add to the expressivity you have as a programmer. Sure, it's overused in the example, but the exaggeration at least has a chance of communicating the point. Maybe the argument is that I should have used a simpler (yet still not trivial) example instead, but I couldn't think of one at the time. Re the "Not only is this very readable" part, I completely agree. I could change it to something less, hmm, bold, but I'm not sure it would make that much of a difference at this point. Suggestions are welcome.