clojure.core/unquote-splicing

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Type: var Added: Clojure unknown Examples: 3 Runnable: 2

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Examples

by huahaiy on 2011-05-11 ▶

(let [x `(2 3)] `(1 ~x)) (1 (2 3)) (let [x `(2 3)] `(1 ~@x)) (1 2 3)

by klauern on 2011-10-21 ▶

`(1 2 ~(list 3 4)) (1 2 (3 4)) `(1 2 ~@(list 3 4)) (1 2 3 4) ; borrowed from StackOverflow: ; http://stackoverflow.com/questions/4571042/can-someone-explain-clojures-unquote-splice-in-simple-terms

by green-coder on 2019-01-16 . May have evaluation errors. ▶

;; The splicing works at any location in the enclosing structure. `(1 ~@(list 2 3) 4 ~@(list 5 6) 7) => (1 2 3 4 5 6 7) ;; The enclosing structure can be a list, a vector or a set. `[1 ~@(list 2 3) 4 ~@(list 5 6) 7] => [1 2 3 4 5 6 7] `#{1 ~@(list 2 3) 4 ~@(list 5 6) 7} => #{7 1 4 6 3 2 5} ;; The splicing produces a sequence from any `sequential?` value. `(1 ~@'(2 3) 4 ~@[5 6] 7 ~@(range 8 10)) => (1 2 3 4 5 6 7 8 9) `(1 ~@{2 3 4 5} 6) => (1 [2 3] [4 5] 6) ;; It currently does not work well inside maps. ;; https://dev.clojure.org/jira/browse/CLJ-1425 `{1 2 ~@[3 4]} Syntax error reading source at (REPL:1:15). Map literal must contain an even number of forms `{1 ~@[2 3] 4 ~@[5 6]} => {1 2, 3 4, 5 6} ;; Workaround: don't use the map literals `(hash-map 1 2 ~@[3 4]) => (clojure.core/hash-map 1 2 3 4)

See also

• clojure.core/unquote (2)

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