you can see his solution... there you will see why

well it's an O(n) solution and there is an obvious O(1) solution

that's why it does not deserve its insane 250 upvotes

Does not work for null items

explain further since you aren't making any sense.

I'm only doing Rust Katas because I've never used it before. It's nice to say why you think iterators are no good here, otherwise you're sort of trolling.

Indeed, but it is rarely needed to be able to handle real infinity.

won't work with inifinite iterators

iterable could be infinite, so ToList() makes no sense

Pure nonsense

To add to the comments above, would also fail for a simple list of { "abc", null, null, "bcc" }

Iterable solution makes no sense as best practice here