Works as requested. But note that this would not work for languages other than english, because then it is not about adding a "s" to make the plural. So making it able to work with italin, spanish or other languages would make necessary to reimplement the formatUnit.

I don't get something. Can somebody explain me why "if (maxWithDigits(i) === mx)"? By doing this you are searching for the max number, but actually what we want is to find the first number (minimum), higher than n, using the given digits.

Brilliant

One of the nicest solutions, IMHO

Very nice approach