how is this the "best practices". I so don't get people on codewars...

It should panic, according to the description that's an invalid input.

If you enter 11 the code will panic. I don't think this is a "best practice."

Great calculations! Awesome))

Would you mind to elaborate? It's almost the same solution in C.

I find it very funny that I'm always overthinking things having a C background, does anyone have any tips?

The reason is people voted it.

Is there a particular reason why this is a good practice?

True, but test passes! :D

True. Although probably not important for the 8th kyu. Thanks :)

This solution mught give incorrect result in case multiplication overflows

Use spoiler flag next time, please.

Thanks)

It collects the range 0 to n (exclusive) in its return type, a Vec<u32>.

Here's a more explicit example:

return (0..n as u32).collect::<Vec<u32>>();

Does that answer your question?