clojure.core/find

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Type: function Added: Clojure 1.0 Examples: 3 Runnable: 2

([map key])

Returns the map entry for key, or nil if key not present.

Examples

by zmila on 2010-07-28 ▶

(find {:a 1 :b 2 :c 3} :a) ;;=> [:a 1] (find {:a nil} :a) ;;=> [:a nil] (find {:a 1 :b 2 :c 3} :d) ;;=> nil

by Nevena on 2011-05-17 ▶

;; Note for these examples: as the authoritative documentation speaks only about ;; map (as first parameter), passing anything else (e.g. a vector, like below) ;; uses an undocumented behavior, which can change anytime and so is unreliable and ;; should be avoided. (find [:a :b :c :d] 2) [2 :c] (find [:a :b :c :d] 5) nil (find [1 2 3] 4294967296) [4294967296 1]

by elias-sw on 2025-07-05 . May have evaluation errors. ▶

;; The resulting map entry is not a vector, although it is printed like that. ;; It is a MapEntry, so you can do: (val (find {:a 5 :b 6} :b)) ;; 6 ;; which of course you cannot do with a vector: (val ([:b 6])) ;; Execution error (ArityException)...

See also

• clojure.core/get (8)
• clojure.core/get-in (5)
• clojure.core/contains? (2)
• clojure.core/select-keys (5)

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