(def john {:name "John"
           :age 17
           :isZoomer? true
           "random-key" 'ok})

(:name john) ;; "John"

(john :age) ;; 17

(john "random-key") ;; ok

(def cases
  {10 (partial * 30)
   20 (partial / 10)
   0 (partial + 1)})

(defn check [num]
  (let [func (cases num)]
    (func num)))

(assoc john :number "912302309")
;; {:name "John",
;;  :age 17,
;;  :isZoomer? true,
;;  "random" ok,
;;  :number "912302309")

(dissoc john :isZoomer?)
;; {:name "John"
;;  :age 17
;;  "random-key" ok}

(select-keys john [:name :age])
;; {:name "John", :age 17}

(merge john {:country "Murica" :state "Florida"})
;; {:name "John",
;;  :age 17,
;;  :isZoomer? true,
;;  "random-key" ok,
;;  :country "Murica",
;;  :state "Florida"}

(update john :age inc)
;; {:name "John"
;;  :age 18
;;  :isZoomer? true
;;  "random-key" ok}