store/[org.clojure/clojure "1.6.0"] clj::clojure.core/dissoc

Official Documentation

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Arities
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   [map]
   [map key]
   [map key & ks]

Docstring
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  dissoc[iate]. Returns a new map of the same (hashed/sorted) type,
  that does not contain a mapping for key(s).

Source

(defn dissoc
  "dissoc[iate]. Returns a new map of the same (hashed/sorted) type,
  that does not contain a mapping for key(s)."
  {:added "1.0"
   :static true}
  ([map] map)
  ([map key]
   (. clojure.lang.RT (dissoc map key)))
  ([map key & ks]
   (let [ret (dissoc map key)]
     (if ks
       (recur ret (first ks) (next ks))
       ret))))

Example 1

Edit
(dissoc {:a 1 :b 2 :c 3}) ; dissoc nothing 
;; => {:a 1, :b 2, :c 3} 

(dissoc {:a 1 :b 2 :c 3} :b) ; dissoc key :b
;; => {:a 1, :c 3} 

(dissoc {:a 1 :b 2 :c 3} :d) ; dissoc not existed key
;; => {:a 1, :b 2, :c 3} 

(dissoc {:a 1 :b 2 :c 3} :c :b) ; several keys at once
;; => {:a 1} 

Uses on crossclj