clojure.core/or

View this page on ClojureDocs

Type: macro Added: Clojure 1.0 Examples: 6 Runnable: 2

([] [x] [x & next])

Evaluates exprs one at a time, from left to right. If a form returns a logical true value, or returns that value and doesn't evaluate any of the other expressions, otherwise it returns the value of the last expression. (or) returns nil.

Examples

by dakrone on 2010-12-30 . May have evaluation errors. ▶

(or true false false) true (or true true true) true (or false false false) false (or nil nil) nil (or false nil) nil (or true nil) true ;; or doesn't evaluate if the first value is true (or true (println "foo")) true ;; order matters (or (println "foo") true) foo true ;; does not coerce a given value to a boolean true, returns the value (or false 42) 42 (or false 42 9999) 42 (or 42 9999) 42

by jafingerhut on 2012-04-13 ▶

;; See examples for "if" explaining Clojure's idea of logical true ;; and logical false.

by ertugrulcetin on 2016-02-05 ▶

;;evaluates last expression for this case (or nil false) false (or false nil) nil

by caumond on 2020-02-09 . May have evaluation errors. ▶

;; Defaulted value (or nil "crazy default value") crazy default value (or "value" "not useful default value") value

by luiszambon on 2020-07-30 . May have evaluation errors. ▶

;; It cares about function's return. Example: ;; println returns 'nil', so the next param will be evaluated. (or (println "Clojure") true "Code" false) Clojure ;;=>true

by tomdl89 on 2022-07-18 . May have evaluation errors. ▶

;; `or` is a macro, so can't be given where a fn is expected (map or [true false] [false false]) ;; => Syntax error compiling at… ;; => Can't take value of a macro: #'clojure.core/or ;; wrap in a fn instead (map #(or %1 %2) [true false] [false false]) ;; => (true false)

See also

• clojure.core/and (3)
• clojure.core/if (2)
• clojure.core/some-fn (2)

---

Content from the matching ClojureDocs page, with authors credited on each contribution.