Yes, I think it's pretty easy to be sure that this isn't where the complexity comes from when there's literally a method to do that on arrays. I'm not even sure which language you're talking about here, because you can call `.len()` in Rust or `.size()` in C++.
If you're trying to remember what the language is where there's no immediately obvious straightforward way to get the length of an array, it's not Rust or C++; you must have been thinking of C.
If you're trying to remember what the language is where there's no immediately obvious straightforward way to get the length of an array, it's not Rust or C++; you must have been thinking of C.