Josh Comer jjcomer
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| (use '[clojure.set :only (difference union intersection)]) | |
| (defn without | |
| "Returns set s with x removed." | |
| [s x] (disj s x)) | |
| (defn take-1 | |
| "Returns the pair [element, s'] where s' is set s with element removed." | |
| [s] {:pre [(not (empty? s))]} | |
| (let [item (first s)] |