I apologize for this question, because I think it has been asked before,
and yet I can not find the answer.
In the definition of zipmap, what do these 2 lines do?
ks (seq keys)
vs (seq vals)
In particular, what is (seq) doing? Is this to ensure that ks is false if
"keys" is empty? And vs is false if "vals" is empty? Because an empty list
(or vector) is truthy but we want it to be falsey in this situation?
Is there any other reason to use (seq), other than to set the truthy/falsey
values of ks and vs?
(defn zipmap
"Returns a map with the keys mapped to the corresponding vals."
{:added "1.0"
:static true}
[keys vals]
(loop [map {}
ks (seq keys)
vs (seq vals)]
(if (and ks vs)
(recur (assoc map (first ks) (first vs))
(next ks)
(next vs))
map)))
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