clojure.core/into-array

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Type: function Added: Clojure 1.0 Examples: 3 Runnable: 0

([aseq] [type aseq])

Returns an array with components set to the values in aseq. The array's component type is type if provided, or the type of the first value in aseq if present, or Object. All values in aseq must be compatible with the component type. Class objects for the primitive types can be obtained using, e.g., Integer/TYPE.

Examples

by ysph on 2011-01-07 . May have evaluation errors. ▶

;; Array's component type is set to (class 2), cannot add Strings. ;; This will result in an IllegalArgumentException (into-array [2 "4" "8" 5]) ;; Evaluation aborted. ;; However, if the common type is specified, aforementioned values can be put into an array (into-array Object [2 "4" "8" 5]) #<Object[] [Ljava.lang.Object;@3aa6d0a4> (into-array (range 4)) #<Integer[] [Ljava.lang.Integer;@63d6dc46> ;; if you assign a type, you still have to coerce values (into-array Byte/TYPE (range 4)) ;; Evaluation aborted. (into-array Byte/TYPE (map byte (range 4))) #<byte[] [B@68ffefc9>

by klauern on 2012-05-25 . May have evaluation errors. ▶

;; java.nio.file.Paths#get takes (String, String...) (java.nio.file.Paths/get "/Users" (into-array ["username" "dev" "clojure"])) #<UnixPath /Users/username/dev/clojure>

by Phalphalak on 2013-05-17 . May have evaluation errors. ▶

;; Creating an empty array defaults to Object[] (into-array []) #<Object[] [Ljava.lang.Object;@21f1151f> ;; However, the type of an empty array can be coerced (into-array String []) #<String[] [Ljava.lang.String;@578baf24>

See also

• clojure.core/to-array (2)
• clojure.core/make-array (0)

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