"🔒"
(def B 1e9)
#Result
##'user/B

"🔒"
(def social-network
    {:members [ {:id 1000
                 :name "Jack"
                 :age 20
                 :hobbies ["sport", "reading"]}
               {:id 1001
                :name "Joe"
                :occupation "electrician"}
               {:id 1002
                :name "Elon"
                :occupation "CEO"
                :hobbies ["space" "coding"]}]
     :companies [{:name "GM"
                  :size 157000
                  :market-cap (* 55 B)}
                 {:name "Twitter"
                  :size 7000
                  :market-cap (* 41 B)}
                 {:name "Spotify"
                  :size 6000
                  :market-cap (* 15 B)}
                 ]
     :connections [{:person-id 1000
                    :company "Twitter"
                    :type :use
                    }
                   {:person-id 1001
                    :company "Twitter"
                    :type :owns}
                   {:person-id 1002
                    :company "GM"
                    :type :works}]
    })
#Result
##'user/social-network

"🔒"
(require '[clojure.pprint :refer [pprint]])
(pprint social-network)
#Result
#{:members
# [{:id 1000, :name "Jack", :age 20, :hobbies ["sport" "reading"]}
#  {:id 1001, :name "Joe", :occupation "electrician"}
#  {:id 1002,
#   :name "Elon",
#   :occupation "CEO",
#   :hobbies ["space" "coding"]}],
# :companies
# [{:name "GM", :size 157000, :market-cap 5.5E10}
#  {:name "Twitter", :size 7000, :market-cap 4.1E10}
#  {:name "Spotify", :size 6000, :market-cap 1.5E10}],
# :connections
# [{:person-id 1000, :company "Twitter", :type :use}
#  {:person-id 1001, :company "Twitter", :type :owns}
#  {:person-id 1002, :company "GM", :type :works}]}
#nil

"🔒"
; get the companies
(get social-network :companies)
#Result
#[{:name "GM", :size 157000, :market-cap 5.5E10} {:name "Twitter", :size 7000, :market-cap 4.1E10} {:name "Spotify", :size 6000, :market-cap 1.5E10}]

"🔒"
; get-in the market-cap of the first company
(get-in social-network [:companies 0 :market-cap])
#Result
#5.5E10

"🔒"
(def is-small (fn [company] (< (:size company) 10000)))
#Result
##'user/is-small

"🔒"
(filter is-small (:companies social-network))
#Result
#({:name "Twitter", :size 7000, :market-cap 4.1E10} {:name "Spotify", :size 6000, :market-cap 1.5E10})