clojure.core/interpose

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Type: function Added: Clojure 1.0 Examples: 2 Runnable: 0

([sep] [sep coll])

Returns a lazy seq of the elements of coll separated by sep. Returns a stateful transducer when no collection is provided.

Examples

by zk on 2010-07-03 . May have evaluation errors. ▶

;; The quintessential interpose example: (def my-strings ["one" "two" "three"]) (interpose ", " my-strings) => ("one" ", " "two" ", " "three") (apply str (interpose ", " my-strings)) => "one, two, three" ;; Might use clojure.string/join if the plan is to join (require '[clojure.string :as str]) (str/join ", " my-strings) => "one, two, three"

by octopusgrabbus on 2012-11-14 . May have evaluation errors. ▶

;; This example converts what would be comma-separated values into pipe '|' ;; separated values for alternate database loads. By switching delimiters, ;; quotes can be eliminated from each sequence element, which are not ;; needed for some databases. (def test-data-in '(("43" "MORRISON, VAN X DMD" "43 ROADWAY" \;) ("25" "JANE SMITH N" "25 GARDEN PATH" \!))) (def test-data-out (map #(concat (interpose \| %) (list \| "\n")) test-data-in)) test-data-out => (("43" \| "MORRISON, VAN X DMD" \| "43 ROADWAY" \| \; \| "\n") ("25" \| "JANE SMITH N" \| "25 GARDEN PATH" \| \! \| "\n")) (doseq [in-seq test-data-out] (doseq [val in-seq] (spit "temp1.csv" val :append true))) ;; cat temp1.csv: ;; 43|MORRISON, VAN X DMD|43 ROADWAY|;| ;; 25|JANE SMITH N|25 GARDEN PATH|!|

See also

• clojure.core/interleave (7)
• clojure.string/join (4)

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