this one excels

I know thank you

naming conventions should be followed, code should be readable. using e and v is very obfuscated

This is a very good solution: the highest performance (according to test results) and short code

Ohh! Genius!

nice one!

It was something like "Delete the nth occurence of an element"
I don't exactly remember.

What was the previous name?

Haha, many people do, the name of this kata was changed several times will do it asap :).
Ty for advice.
EDIT: done ;).

Maybe the title of the kata should be changed to "Delete occurrences of an element if it occurs more than n times" or something like that
I got completely confused by it :D

It should work, but it doesn't for some reason.

Thank you very much for your example test cases; I have added them :D

No, I meant the test cases that appear in the "Your test cases" box on the bottom and run when you hit "Run Tests".
Here's some if you wanna put them.

Test.assertEquals([].toString(), "[]", "Should be able to handle empty arrays");
Test.assertEquals([[[[[[]]],[]]]].toString(), "[[[[[[]]],[]]]]", "Should be able to handle empty nested arrays");
Test.assertEquals([1.545,[2,4,[23532],55,2.3,[15.22,0.3,[],[[72,3],5]]]].toString(), "[1.545,[2,4,[23532],55,2.3,[15.22,0.3,[],[[72,3],5]]]]", "Should work with nested arrays");
Test.assertEquals(["foobar",[["hello"]]].toString(), "['foobar',[['hello']]]", "Should enclose strings with single quotes");

Thank you very much for your kind words :D

But I thought there were already quite a few fixed and random test cases? If you think it is not enough I can always add a few more :)

Great and fun kata, keep it up.
just needs some test cases. :D