Very good, thank you!!!

Interesting. There are seven Ruby solutions that have been submitted over the past few days.
Do you also see the array being sent to your function?

Just updated the Ruby solution to make 0 neutral. Will probably take a bit to propagate.
Thanks for pointing out the issue.

Thanks, I added the second 'abc' test.
I didn't add the '' characters test as there's a valid hash for the empty string.