Created
June 1, 2015 18:09
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| 7 user=> (def get-prev-and-set (let [a (atom {})] (fn [x] (let [r (@a :a)] (swap! a assoc :a x) r)))) | |
| 6 #'user/get-prev-and-set | |
| 5 user=> (get-prev-and-set 1) | |
| 4 nil | |
| 3 user=> (get-prev-and-set 123) | |
| 2 1 | |
| 1 user=> (get-prev-and-set 42) | |
| 8 123 |
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