When working on a list, both cons and conj add to the front. In my
tests, cons is considerably faster than conj. I'm trying to figure out
why.
Here's the implementation of conj.
(def
#^{:arglists '([coll x] [coll x & xs])
:doc "conj[oin]. Returns a new collection with the xs
'added'. (conj nil item) returns (item). The 'addition' may
happen at different 'places' depending on the concrete type."}
conj (fn conj
([coll x] (. clojure.lang.RT (conj coll x)))
([coll x & xs]
(if xs
(recur (conj coll x) (first xs) (next xs))
(conj coll x)))))
The line for the parameter list [coll x] seems to call itself
recursively with the exact same arguments. How does that ever
terminate?
--
R. Mark Volkmann
Object Computing, Inc.
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