Just recently stumbled upon `reduced` and `reduced?`. It seems rather
magical... how does the outer `reduce` (or `reductions`) know to stop? That
is, how does the function which is being called (`reduced`) affect the
function that's calling it (below, `reductions`)? :
~~~clojure
(defn main
[]
(let [res (reductions (fn [accum x]
(if (< accum 100)
(+ accum x)
(reduced [x accum])))
(range))]
(prn res)
(prn (reduced? res)) ;=> false
(prn (reduced? (last res))))) ;=> false --- why isn't this `true`?
~~~
Also, what's the use of `reduced?`, and on what in the above snippet would
I call it to return true?
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