clojure.core/number?

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Type: function Added: Clojure 1.0 Examples: 4 Runnable: 4

([x])

Returns true if x is a Number

Examples

by dpritchett on 2010-07-14 ▶

(number? 1) true (number? 1.0) true (number? :a) false (number? nil) false (number? "23") false

by xantheon on 2015-01-21 ▶

;; map number? over the vector (map number? [1 0.44 3e6 0xFF]) ;;=> (true true true true) ;; map number? over the vector created by converting a list into a vector ;; with the function "into" (map number? (into [] '(1 0.44 3e6 0xFF))) ;;=> (true true true true)

by sixofhearts on 2021-12-08 ▶

;; Works for rationals (number? (/ 2 3)) true

by g-tardy on 2024-10-24 ▶

;; Warning! NaN is considered as a number in member of the class Double. ;; this may be confusing, but it's good to know, ;; especially if you are working with filters (number? Double/NaN) true (filter number? [nil 0 1.1 "String" {:key :val} Double/NaN]) (0 1.1 ##NaN)

See also

• clojure.core/num
• clojure.core/integer? (3)

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