Hi All,
Could someone please explain why reduced? is being used in the reductions
function (below)? From what I understand reduced? checks if there has been
a call to reduced and I don't see where that might be happening.
Also, why is the deref macro being used with init?
thanks,
Alex
(defn reductions
"Returns a lazy seq of the intermediate values of the reduction (as
per reduce) of coll by f, starting with init."
{:added "1.2"}
([f coll]
(lazy-seq
(if-let [s (seq coll)]
(reductions f (first s) (rest s))
(list (f)))))
([f init coll]
(if (reduced? init)
(list @init)
(cons init
(lazy-seq
(when-let [s (seq coll)]
(reductions f (f init (first s)) (rest s))))))))
from:
https://github.com/clojure/clojure/blob/clojure-1.7.0/src/clj/clojure/core.clj#L6921
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