No good for beginners, IMO. Using object properties, and requiring knowledge of modulo doesn't seem like 8 Kyu to me. I think the idea is great though, and a simple list version would work well at 7 Kyu.

It should be 6 has 2 on bits (000...0110).

What am I missing here: "6 has 2 on bits (000...0011)"?

Use spaces and words for numbers only. Not expecting any "and", or "-" or anything else you might think of.

Your example with/without "and" will have same sort order anyway though (if consistently applied)

Aren't there multiple ways to express numbers using words? E.g "nine hundred ninety nine", or "nine hundred and ninety nine", or "nine hundred and ninety-nine". Do we ned to use a specific format to pass the tests?

The random tests for php were wrong. Fixed.

Oh, since posting that last message, I can!

St3f4n I can't read your reply as it's hidden (I guess because I haven't yet passed the kata, or maybe it contains code?)

Thank you :) I've ranked on this kata :) . Blind4Basics - I have problems only with this.

(if only it was the only troubles... ;) )

Yes! The problem was in name class, should be SmileFaces not smileFaces and then not void method -> int.

you're welcome. ;)