clojure.core/remove

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Type: function Added: Clojure 1.0 Examples: 6 Runnable: 6

([pred] [pred coll])

Returns a lazy sequence of the items in coll for which (pred item) returns logical false. pred must be free of side-effects. Returns a transducer when no collection is provided.

Examples

by zmila on 2010-08-11 ▶

(remove pos? [1 -2 2 -1 3 7 0]) ;;=> (-2 -1 0) (remove nil? [1 nil 2 nil 3 nil]) ;;=> (1 2 3) ;; remove items that are evenly divisible by 3 (remove #(zero? (mod % 3)) (range 1 21)) ;;=> (1 2 4 5 7 8 10 11 13 14 16 17 19 20)

by phreed on 2015-01-08 ▶

;; compare to filter (remove even? (range 10)) ;;=> (1 3 5 7 9) (remove (fn [x] (= (count x) 1)) ["a" "aa" "b" "n" "f" "lisp" "clojure" "q" ""]) ;;=> ("aa" "lisp" "clojure" "") ; When coll is a map, pred is called with key/value pairs. (remove #(> (second %) 100) {:a 1 :b 2 :c 101 :d 102 :e -1}) ;;=> ([:a 1] [:b 2] [:e -1])

by esumitra on 2016-01-20 ▶

;; remove items from a set/list (remove #{:a} #{:b :c :d :a :e}) ;;=> (:e :c :b :d) (remove #{:a} [:b :c :d :a :e :a :f]) ;;=> (:b :c :d :e :f)

by vastus on 2018-01-21 ▶

;; use map as a pred (remove {:a 42 :b 69} #{:a :b :c}) ;;=> (:c)

by kevinmungai on 2020-07-12 ▶

;; remove all the hyphens in an ISBN Number (into [] (remove #{\-}) "3-598-21508-8") ;;=> [\3 \5 \9 \8 \2 \1 \5 \0 \8 \8] ;; remove is used in the capacity of a transducer

by E-A-Griffin on 2020-09-30 ▶

;; remove unique elements from collection (def nums (concat (range 10) (range 5 15))) (keys (remove (fn [[k v]] (= v 1)) (frequencies nums))) ;;=> (7 6 9 5 8) ;; remove unique elements from collection, preserving order (defn keep-duplicates [coll] (sort-by #((into {} (map-indexed vector coll)) %) (keys (remove (fn [[k v]] (= v 1)) (frequencies coll))))) (keep-duplicates nums) ;; => (5 6 7 8 9) (def rev-nums (reverse nums)) (keep-duplicates rev-nums) ;;=> (9 8 7 6 5)

See also

• clojure.core/filter (6)
• clojure.core/group-by (7)
• clojure.core/keep (8)
• clojure.core/dissoc (3)

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