performance criteria differ alot between translations

Well said. Thanks man

What you lack is confidence. You are 8Kyu. Try doing 20 8kyu numeric Katas, then 20 7kyu, then you'll be ready for this beast. I have to warn you that this Kata is easily a 5Kyu.See sentiments below.

Thanks for the tip. I used it but still!
oh well..

The timing out is pretty insane. Is this more about optimization?

Wow, I didn't know the console.log() could produce innacurate results! Good to know. Thanks for your help

You can always print the returned value instead in your IDE, like this: p to_camel_case("the-stealth-warrior") it's easier then to copy and paste your code here.

The reason I printed is so I can see what is being returned in my IDE.
And i'll look at how I can address underscores, thank you.

Return instead of printing the result for once. But your code isn't ok, it fails with underscores.

Not a kata suggestion, please, don't post solutions in discourse, it's forbidden.