I solved problem.Thank's!

@Midkniteskyz your code should return a single string, check the sample tests, you're printing several strings instead.

@InOutCodeItAbout: Please, don't post your javascript code under a Shell issue, they're not related. Already answered your question in your own post.

Read the Note at the end of the kata description.

I think it is the checker, I think they have only written their test in one way and didn't account different ways to doing it, I am new to JS and learning and I done it and it work in my console.

Approved

oh ok thanks

You are supposed to return not print(). Note that you can only return once, so...

when I run it the result is 'None'

Format your code with this link so it is much more readable. In regards to your code, it is fast enough - I'll follow up after I properly debug it.