I was browsing through core when I noticed something I didn't
understand in 'into' (from core.clj):
;redef into with batch support
(defn into
"Returns a new coll consisting of to-coll with all of the items of
from-coll conjoined."
[to from]
(if (instance? clojure.lang.IEditableCollection to)
(#(loop [ret (transient to) items (seq from)]
(if items
(recur (conj! ret (first items)) (next items))
(persistent! ret))))
(#(loop [ret to items (seq from)]
(if items
(recur (conj ret (first items)) (next items))
ret)))))
I am wondering about the construct #(loop ...). As far as I can see
you might as well just use (loop). I.e.,
(defn into2
"Returns a new coll consisting of to-coll with all of the items of
from-coll conjoined."
[to from]
(if (instance? clojure.lang.IEditableCollection to)
(loop [ret (transient to) items (seq from)]
(if items
(recur (conj! ret (first items)) (next items))
(persistent! ret)))
(loop [ret to items (seq from)]
(if items
(recur (conj ret (first items)) (next items))
ret))))
I suspect that I am missing some point. Could someone clarify?
/Karl
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