Look at TenC comment here. It demotivated him so much, he didn't make it past 8 kyu. This is why it's so important. The next comment is by a 3 kyu programmer, who additionally expressed much time was wasted.

Same problem)

It's a bit hard tbh. I found a solution to it but wasn't accepted because of timing out.

The exercise makes sense after reading this explanation.

The description states:

Note: m, n, f, b, c are positive integers, where 0 <= m <= n or m >= n >= 0. m and n are inclusive.

Yeah same. It just doesnt tell anything what to do. xD

good job

Somehow managed to solve this, but with pretty uggly code. This was hard for me. :(

For 20 minutes I did not understand how players change. xD Nice kyu.

I even set a default parameter for function addOrChangeUrlParameter(url, val = ""), but not working (Cannot read property 'split' of undefined,) It IS defined, always, even when not passed in..

One " " made this painfull. xD

Who else googles prime helper function after solving primes couple times without googling? xD

Very funny and easy challenge, it's more about being precice than else, congratulations.

use some kind of tolerance for checking if a number is an integer