I did

Use a spoiler flag please, comments are visible to everyone.

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lame dude what are you doing..

this will remember me that i am not that bad)) (no offence)

Please, use spoiler flag next time.

That's better than mine. I got just over 8400ms. I tested the first three on the solutions page and yours was faster than them all.

That's not a kata issue, use question. for is a loop, and indexOf is a loop-alike method, they're nested so your algorithm is O(n ^ 2), it won't work.

If you get that error, change your language version to 3.6.0
I can't select other version, but to some people, 3.4.3 is shown too.

This problem is more difficult than a kyu 5 problem

It is not.

Quesion answered by Chrono79 alredy. Closing.

Thanks Chrono79

Yes, avoid them.