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Editorial Team
Asked: May 18, 20262026-05-18T09:54:40+00:00 2026-05-18T09:54:40+00:00

In Clojure, how do you partition a sequence to subsequences of repeating elements? E.g.

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In Clojure, how do you partition a sequence to subsequences of repeating elements? E.g. :

[1 2 2 3 3 3 4 2 2 1 1 1]

to

[[1] [2 2] [3 3 3] [4] [2 2] [1 1 1]]

I’ve been playing around with some examples trying to understand clojure better, and was stuck on this one for some time.

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  1. Editorial Team
    Editorial Team
    2026-05-18T09:54:41+00:00Added an answer on May 18, 2026 at 9:54 am
    user> (partition-by identity [1 2 2 3 3 3 4 2 2 1 1 1])
    ((1) (2 2) (3 3 3) (4) (2 2) (1 1 1))
    
    user> (vec (map vec (partition-by identity [1 2 2 3 3 3 4 2 2 1 1 1])))
    [[1] [2 2] [3 3 3] [4] [2 2] [1 1 1]]
    
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