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I know thank you

naming conventions should be followed, code should be readable. using e and v is very obfuscated

I was wondering why I couldn't get an arrow function to work with implicit return...thanks!

definately not a 6kyu - if you compare solutions of this and other 6kyu's ...

no.

Would a bactracking solution be overkill?

Sick!!

I am feeling a little simple as I haven't figured out how the series is generated from line to line

Your solution is so terse my version is so verbose

I will try. Looking at the number we can see the smallest digit is 1 which appears in the number in several places, at positions 6,7 and 10 using 0 based indexing.
We choose the the last occurence of the minimumal digit to find the smallest number, so we can tranformer the number say to an array or string to using the built in
method lastIndexOf()

How is this a 5kyu?

I am not sure why thr first test and the first test only is not passing when using Javascript

OK it's not going to take much to sort this out, all I would have to do to pass your test case is to replace the 0 in the array to 1 and ignore the map function as javascript will does the necessary conversion in the reduce part. I am not sure how long ago I wrote this solution but I am sure I was new to the language, but thank you for highlighting the shortcomings with this solution thank you. Now if you can check the outs I have done that would be appreciated

Yes, it is working. Because cata has bad tests :)
Okay, n is always positive, so it would never be 0.

But you can try something else, for example - 40585.

// 4! = 24
// 0! = 1
// 5! = 120
// 8! = 40320
// 5! = 120

Correct => 24 + 1 + 120 + 40320 + 120 = 40585
In your case => 24 + 0 + 120 + 40320 + 120 = 40584 (wrong...)