probably harder than 7kyu.

I actually don't agree. I think it's 8 kyu.... very very easy.

I agree to an extent.

I think this is def harder then a 7kyu for most, but I can only imagine this becomeing second nature once learned.
So idk how you would really rank this. It's probably too easy for anyone higher in rank but is harder for anyone lower.

I personally had some trouble with it and only slightly knew how to achieve it due to being exposed to it a bit in eloquent javascript.

Good and thanks!