Suggestion for initial code sample
From:
function spinWords(){
//TODO Have fun :)
}
To:
function spinWords(words){
//TODO Have fun :)
}

My solution was wrong. I did some console.log on the passed input and my calculation to find my miscalculation.

My solution is now working, and I'm closing the issue. (as there was not issue to begin with)

Not able to pass the last test in javascript when submitting
✔ Test Passed
✔ Test Passed
✘ Value is not what was expected

I'm fairly sure that my code is correct. But as I cannot see the input and expected values once submitting, it's a bit hard to verify and finish the Kata.