clojure.core/dedupe

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Type: function Added: Clojure 1.7 Examples: 4 Runnable: 0

([] [coll])

Returns a lazy sequence removing consecutive duplicates in coll. Returns a transducer when no collection is provided.

Examples

by blx on 2015-08-21 . May have evaluation errors. ▶

(dedupe [1 2 3 3 3 1 1 6]) (1 2 3 1 6)

by AMacGregor27 on 2019-05-27 . May have evaluation errors. ▶

;; This is taken from a problem on 4Clojure (30. Compress a sequence). (dedupe "Leeeeroy") (\L \e \r \o \y) (dedupe [[1 2] [1 2] [3 4] [1 2]]) ([1 2] [3 4] [1 2]) (dedupe [[1 [1 2]] [1 [2 3]] [1 [1 2]] [1 [1 2]]]) ([1 [1 2]] [1 [2 3]] [1 [1 2]]) ;; This does not remove all duplicates from a collection, only consecutive ones. (dedupe [1 2 2 1 1 1 2 1 2 2]) (1 2 1 2 1 2) ;; To remove all duplicates, use distinct. (distinct [1 2 2 1 1 1 2 1 2 2]) (1 2)

by siddharthjain-in on 2020-12-05 . May have evaluation errors. ▶

(dedupe [1/2 2/4]) (1/2) (dedupe [1/2 2/6]) (1/2 1/3) (dedupe [1/2 0.5 2/4]) (1/2 0.5 1/2)

by huahaiy on 2021-12-13 . May have evaluation errors. ▶

;; parentheses can be omitted in thread macro (->> [1 1 2 2] (map inc) dedupe) (2 3) ;; transducer version that does not work, parentheses cannot be omitted (sequence (comp (map inc) dedupe) [1 1 2 2]) Execution error (IllegalArgumentException) at user/eval15380 (form-init7517833771916228311.clj:104). Don't know how to create ISeq from: clojure.lang.TransformerIterator$1 ;; transducer that works (sequence (comp (map inc) (dedupe)) [1 1 2 2]) (2 3)

See also

• clojure.core/distinct (3)

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