clojure.core/long

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

([x])

Coerce to long

Examples

by zmila on 2010-08-05 . May have evaluation errors. ▶

v.1.3.0 (let [num (* 1234567890 21)] [num (int num) (long num)]) [25925925690 156121914 25925925690] v.1.6.0 (let [num (* 1234567890 21)] [num (int num) (long num)]) IllegalArgumentException Value out of range for int: 25925925690

by zmila on 2010-08-05 . May have evaluation errors. ▶

v.1.3.0 (= 21 (long 21)) true ;; but (.equals 21 (long 21)) false ;; and thus (get {21 :twenty-one} (long 21)) nil v.1.6.0 (= 21 (long 21)) true (.equals 21 (long 21)) true (.equals 21.0 (long 21)) false (.equals (long 21.0) (long 21)) true

by wdhowe on 2020-08-05 . May have evaluation errors. ▶

(long 123) ;;=> 123 (long 1.23) ;;=> 1 (long 1.2345678901234567890) ;;=> 1 (long -1) ;;=> -1 ;; Casting a string does not work (long "123") ;;=> Execution error (ClassCastException) at user/eval187 (REPL:1). ;;java.lang.String cannot be cast to java.lang.Number ;; Use parse-long instead (parse-long "123") ;;=> 123 ;; Content originally posted by u/didibus on https://clojuredocs.org/clojure.core/num

Note by clojureking

the second example is no longer true.

See also

• clojure.core/int
• clojure.core/longs (1)
• clojure.core/long-array
• clojure.core/unchecked-long
• clojure.core/parse-long

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