so nice! :)

just tested 'wqqq' case. indeed it fails.

Some not very clever people post codewars solutions on github, there are whole collections of them. So if someone wants he can nearly always find it.

oh, this is good

very nice

Yeah, that's right bro

Good bro

out of the box type of thinking, my admiration!

You are not first who noticed that) At the very bottom of commets you'll see almost the same statement from seven years ago. Nothing's changed since then:) Personally I did't test this solution.

Where is the part, where you prove that a letter is not double in the str string ?
i dont understand this solution?

No, It will fail in some cases like s = 'wqqq'.

But I think you're not seeing the forest for the trees here. The approach itself is incorrect (try inputs like aaab provided by other commenters); I think that's the main issue first and foremost

purest gold