Not a kata suggestion, 63 Codewarriors have passed this one

Hi. If you want a really difficult 5kyu - check this https://www.codewars.com/kata/58db9545facc51e3db00000a I havent finished it yet. Its the same as this kata, but like ten times harder.

No going to lie, this took me a little over an hour. Kept getting stuck.

Good for you :)

I also stumbled over the 4 kyu, but especially because it is mentioned being easier than the kata "A Simple Music Encoder" - which is 5 kyu.
"A Simple Music Encoder": https://www.codewars.com/kata/58db9545facc51e3db00000a

I would like to suggest to add a specific test case. My first solution got accepted sometimes, and sometimes not, dependent on the randomised test cases. In case of a range, followed by a single final digit, it generated an error. So it with this (shortened) input
[..., -59, -58, -57, -54]
it generated this (shortened) output
'...,-59--54'
instead of the correct output:
'...,-59--57,-54'

I would suggest to include this test case, so it is always tested.

But I am a human!

Sorry, I dont have insta, twitter or facebook =)

can i get ur insta? thx.

Because my algorithm is very poor.

You dont need to use .filter =)

Why so complecated?

dont listen to them, they just envy your one-liner solution

you can use Set.size instead of Array.length