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Why is it any better/faster than a simple switch case like this in Clojure: #(case % 1 31 2 28 3 31 4 30 5 31 6 30 7 31 8 31 9 30 10 31 11 30 12 31)

#([31 28 31 30 31 30 31 31 30 31 30 31] (dec %))

> Why is it any better/faster than a simple switch case like this in Clojure

It's not about better or faster. It's fun to think of things like this. :)

Or in C: f(int m) { return [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31][m] }

The OP didn't claim it was better than anything, it's just a nice exercise in style!