contains?(clojure.core)

Returns true if key is present in the given collection, otherwise returns false. Note that for numerically indexed collections like vectors and Java arrays, this tests if the numeric key is within the range of indexes. 'contains?' operates constant or logarithmic time; it will not perform a linear search for a value. See also 'some'.

; clojure/core.clj:877
(defn contains?
  [coll key] (. clojure.lang.RT (contains coll key)))

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