I have a map that describes a person.
It has a key that describes their address.
It also has a key for their employer.
The employer has its own address.

(def person {
  :name "Mark Volkmann"
  :address {
    :street "644 Glen Summit"
    :city "St. Charles"
    :state "Missouri"
    :zip 63304}
  :employer {
    :name "Object Computing, Inc."
    :address {
      :street "12140 Woodcrest Executive Drive, Suite 250"
      :city "Creve Coeur"
      :state "Missouri"
      :zip 63141}}})

Is this the best way to retrieve the employer city?
(reduce get person [:employer :address :city])

Is this the best way to get a new map where the city is changed?
(update-in person [:employer :address :city] (fn [old & args] "Clayton"))
I can't get this to work with #("Clayton") in place of the anonymous
function above.

-- 
R. Mark Volkmann
Object Computing, Inc.

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