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Is it the hardest programming puzzle I've ever seen? No. Would it be a fun diversion on a subway ride? Yes (the first time at least). It's one of the trickier subway ads I've ever seen - not the hardest mind you - that was on the Paris Metro; I'm still not sure if it was an ad for beard combs or funerals.

Anyway, I was hoping you'd have re-written it by now in a purely functional way.

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Adam Henley (He/Him)

I’m a Lead Developer and write mostly Ruby on Rails. I also dabble in any language that takes my fancy.