Pivot

Let’s say you have the following 2 vectors:

[1 3 5 7]
[2 4 6 8]

How would you the following result?

[ [1 2]
  [3 4]
  [5 6]
  [7 8] ]

Use interleave and partition

interleave zips the two collections and flattens the result:

(interleave [1 3 5 7] [2 4 6 8]) ;; => (1 2 3 4 5 6 7 8)

partition creates collections every n steps:

(partition [1 2 3 4 5 6 7 8]) ;; => ((1 2) (3 4) (5 6) (7 8))

Using them both:

(->> (list [1 3 5 7] [2 4 6 8] )
     (apply interleave)
     (partition 2)
     )
;; => ((1 2) (3 4) (5 6) (7 8))

(->> (list [1 3 5 7] [2 4 6 8] )
     (apply interleave)
     (partition 2)
     )
;; => [[1 2] [3 4] [5 6] [7 8]]

Use map with multiple collections

Alternatively, map can take more than one collection as an argument:

(map list [1 3 5 7] [2 4 6 8]) ;; => ((1 2) (3 4) (5 6) (7 8))

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• Tag: clojure