store/[org.clojure/clojure "1.8.0"] clj::clojure.core/find-ns

Official Documentation

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Arities
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   [sym]

Docstring
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  Returns the namespace named by the symbol or nil if it doesn't exist.

Source

(defn find-ns
  "Returns the namespace named by the symbol or nil if it doesn't exist."
  {:added "1.0"
   :static true}
  [sym] (clojure.lang.Namespace/find sym))

Example 1

Edit
(require 'clojure.string)
;; => nil

(find-ns 'clojure.string)
;; => #<Namespace clojure.string>

Uses on crossclj