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You're viewing version 1.2.0 of difference. The latest stable version of Clojure Core is 1.3.0.

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1.2.0

1.2.0
1.3.0

difference

clojure.set

(difference s1)
(difference s1 s2)
(difference s1 s2 & sets)

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

2 Examples top

link | changes
```
user=> (difference #{1 2 3})
#{1 2 3}
user=> (difference #{1 2} #{2 3})
#{1}
user=> (difference #{1 2 3} #{1} #{1 4} #{3})
#{2}
```
user=> (difference #{1 2 3}) #{1 2 3} user=> (difference #{1 2} #{2 3}) #{1} user=> (difference #{1 2 3} #{1} #{1 4} #{3}) #{2}
link | changes
```
user=> (difference (set (keys {:1 1 :2 2 :3 3})) (set (keys {:1 1 :2 2})))
#{:3}
user=> (difference (set (keys {:1 1 :2 2})) (set (keys {:1 1 :2 2 :3 3})))
#{}
```
user=> (difference (set (keys {:1 1 :2 2 :3 3})) (set (keys {:1 1 :2 2}))) #{:3} user=> (difference (set (keys {:1 1 :2 2})) (set (keys {:1 1 :2 2 :3 3}))) #{}

Source clojure/set.clj:48 top

(defn difference
  "Return a set that is the first set without elements of the remaining sets"
  {:added "1.0"}
  ([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))))

Vars in clojure.set/difference: < conj contains? count defn disj fn reduce

Used in 0 other vars

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Clojure Core

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difference

clojure.set

2 Examples top

See Also top

Source clojure/set.clj:48 top

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