clojure.set/union

function

since v0.0-927

clojure.set/union

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Details:

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See Also:

• clojure.set/intersection
• clojure.set/difference
• clojure.set/superset?

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Source docstring:

Return a set that is the union of the input sets

(defn union
  ([] #{})
  ([s1] s1)
  ([s1 s2]
     (if (< (count s1) (count s2))
       (reduce conj s2 s1)
       (reduce conj s1 s2)))
  ([s1 s2 & sets]
     (let [bubbled-sets (bubble-max-key count (conj sets s2 s1))]
       (reduce into (first bubbled-sets) (rest bubbled-sets)))))

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