hehm,

seems to be a Question rather than an Issue :|

its funny

Not a suggestion!

Agreed. The description needs to be updated.

You edited your question, but it was like why do I have to use filter if it's not in the exercise constraints?

You have to use the filter-method of Javascript, which returns each element of the array for which the filter-method returns true.

Isn't it? Also, the kata title is: Javascript filter - 3

The kata has been approved, nobody is going to change it now.

Done

Added to description

throw an error in JS

Why would you walk in a circle if you end up in the same place?
Imagine you are walking down helix stairs, you need to walk in a circle to get down.

It's been already discussed below, take a look at those posts.