Sure enough we can press into service map and reduce to get us the information we need.
The end result works well, is concise and readable (it's a lot shorter than the other proposed solutions at least). Usually if the answer is more than one or two lines of some fancy function I don't have the time, but yesterday the challenge was to rank poker hands and it struck me as one of those things that 'should' be easy! You, like me, may have a play at solving some of the daily challenges here on DEV.
