Javascript:

const cards = () => ['♥','♠','♣','♦'] .map((suite) => (['2','3','4','5','6','7','8','9','10','J','Q','K','A'].map((card) => suite + card)))

Clojure:

(defn new-deck [] (for [r [\♥ \♠ \♣ \♦] s [:2 :3 :4 :5 :6 :7 :8 :9 :10 :J :Q :K :A]] [r s]))

💻