clojure.core/bytes

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Type: function Added: Clojure 1.1 Examples: 2 Runnable: 0

([xs])

Casts to bytes[]

Examples

by leifp on 2012-07-17 . May have evaluation errors. ▶

;; for fast interop (bytes (byte-array (map (comp byte int) "ascii"))) ;=> #<byte[] [B@7a004f62> (def the-bytes *1) ;=> #'user/the-bytes (set! *warn-on-reflection* true) (defn get-byte [the-bytes i] (aget the-bytes i)) ;=> #'user/get-byte Reflection warning, NO_SOURCE_PATH:1 - call to aget can't be resolved. (defn get-byte [the-bytes i] (let [the-bytes (bytes the-bytes)] (aget the-bytes i))) ;=> #'user/get-byte (get-byte the-bytes 0) ;=> 97

by tomdl89 on 2022-07-01 . May have evaluation errors. ▶

;; byte-array will convert where possible (byte-array [127 128 129]);; => [127, -128, -127] ;; bytes will not (try (bytes [127 128 129]) (catch ClassCastException e (ex-message e))) ;; => "clojure.lang.PersistentVector cannot be cast to [B"

Note by Brian Marick

Why is the (comp byte int) required in the example? This seems to work just as well:

user=> (def b (bytes (byte-array (map byte "ascii"))))
user=> (String. b)
"ascii"

Note by Brian Marick

For that matter, why is the bytes needed? Consider:

user=> (String. (byte-array (map byte "ascii")))
"ascii"

Note by xcthulhu

AFAIK, bytes is used for referring to bytes[].class from JAVA

Example (midje):

 (fact (class (.getBytes "test")) => bytes) ; true

See also

• clojure.core/byte-array (0)
• clojure.core/bytes?

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