Well, we all know that the answer is correct. But I believe we need some more details on how you've got it. Please check my solution for the details

Moreover, the solution uses a lot of regex match calls for the same array items during the sorting. That is not efficient by its nature.

Hi there!

I like the idea, but it performs reduce twice per each element.
This is very inefficient in terms of performance. Please check my solution to see how to call reduce just once per the array.

Regards