I am surprised that a map literal is clojure.lang.PersistentArrayMap but as
soon as I assign it to a var, it becomes clojure.lang.PersistentHashMap.
Are there any rules for being able to predict when these conversions occur?
user> (type {})
clojure.lang.PersistentArrayMap
user> (type {:what "why?"})
clojure.lang.PersistentArrayMap
user> (def curious {:what "why?"})
#'user/curious
user> (type curious)
clojure.lang.PersistentHashMap
user> (def sug (assoc curious :whodoneit "mikey"))
#'user/sug
user> (type sug)
clojure.lang.PersistentHashMap
I am curious because I wrote a (reduce) function which mostly just builds a
map:
(assoc map-of-data (:item-name next-item) next-item))
Since I was using assoc I was certain I would
get clojure.lang.PersistentHashMap back, but instead I
got clojure.lang.PersistentArrayMap.
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