Clojure transform map values which are vectors to set - clojure

Question

I am new at Clojure. I have a map like
{:title "The Little Schemer"
:authors [friedman , felleisen]}
I want to transform it to:
{:title "The Little Schemer"
:authors #{friedman , felleisen}}
I attempted like:
(def friedman {:name "Daniel Friedman" :birth-year 1944})
(def felleisen {:name "Matthias Felleisen"})
(defn old-book->new-book [book]
(set (:authors book)
)
)
(println (old-book->new-book {:title "The Little Schemer"
:authors [friedman , felleisen]}))
; => Output: #{{:name Daniel Friedman, :birth-year 1944} {:name Matthias Felleisen}}
; => Expected-Output: #{friedman , felleisen}
Here the defs friedman and felleisen gets executed and there results are getting transformed to set. But, I want the function names to be converted to set instead of their results.

Answer 1

First of all try to println this:
(println {:title "The Little Schemer"
:authors [friedman , felleisen]})
The output will be:
{:title The Little Schemer, :authors [{:name Daniel Friedman, :birth-year 1944} {:name Matthias Felleisen}]}
So, what happened here? As You know in this context friedman and felleisen is a variables, so, if You print them - they will be appear in a print message by values. For example:
(def a 1)
(println a)
Will print 1, because of a is just a variable.
The code which you shown here do what You want and when you print it - then values of variable of friedman and felleisen substitute by values.
Your vector of autors((:authors [friedman felleisen])) after disposing the function set will be converted to a set, what we saw from Your output.