clojure.set/difference

function

since v0.0-927

clojure.set/difference

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Details:

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See Also:

• clojure.set/union
• clojure.set/intersection
• clojure.set/superset?
• clojure.set/project

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Source docstring:

Return a set that is the first set without elements of the remaining sets

(defn difference
  ([s1] s1)
  ([s1 s2] 
     (if (< (count s1) (count s2))
       (reduce (fn [result item] 
                   (if (contains? s2 item) 
                     (disj result item) 
                     result))
               s1 s1)
       (reduce disj s1 s2)))
  ([s1 s2 & sets] 
     (reduce difference s1 (conj sets s2))))

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