let n = '7';
n = +n;

console.log(n) //you will see 7.

You forgot to convert back string to number

It's actual (your function's output) should equal expected actually, so you're returning a list of strings instead of a list of numbers.

The error message is pretty clear, what's the question?

ah, ok.

btw: if you wanna help, first step is to "help yourself": begin with doing the very basic debugging steps on your own:

• print the inputs
• study assertion messages
• build some tests on your own if needed

and if that's not enough, you can come here to ask for help. But then, you'll never get any feeback if you don't provide any meaningful information, like at the very least: what kind of errors do you get? expections or just failed assertions?, what exception?, what assertion feeback?, ...

seriously...? :/
You didn't see my answer to your other message?

not an issue, a question.

• issue = problem in the kata
• question = problem in your code. ;)

(unfortunately, I don't do C++, so I cannot help)

See the last sample test.