Wow, this is amazing. It explains many things. Ty. Didnt know about this.

For the last sample test shouldn't -28369 => "28369" not "28-3-6-9"? The instructions clearly state that if the number is negative, remove the negative sign.

Hi Gabri, what did the comment say? I am running into the same issue as you where the code runs successfully in other editors.

Can anyone explain why there is n / 2? Thanks

Try the code here: http://pythontutor.com/javascript.html#mode=edit