May be I missed something but why nobody didn't talk about the case where there is no 'x' and 'o' in the string

Grave18 You could still minimize it with an inline || operator , just saying =)

Solving this kata I choose shorter code length.
If you think about algorythm optimization - maybe you're right.

I think my solution is better

100 percent agree. It's definitely not ideal.

So happy i did the same !! x)

IT WAS POSSIBLE!?

I can't understand why people consider this like a best solution.
String is handled twice (!!)

Is it correct to do things in one line? I mean, not this case, but what if I would like to see what the count of 'x' returnded? Like debugging the problem?