How do I get return value from JS function

How to get return value from this function?

I tried this:

But it doesn't work

upd: the console.log(...) works but return doesn't return a value to C2 variable

That 0 by where the cursor is in your screenshot has quote marks around it, but not & symbols which would cause it to be read as a string.

mrtumbles

Yeah, I know. It doesn't matter. Just mistaken when tried to simplify the code. Previously there was "&loopindex("i")&"