I don't understand why the two functions below (recurs and transi) do
not produce the same result. To the best of my understanding doseq
will consume an entire sequence as demonstrated here:
user=> (doseq [x (range 0 10)] (print x))
0123456789nil
user=> *clojure-version*
{:major 1, :minor 3, :incremental 0, :qualifier nil}
user=> (defn recurs [dest src]
(if-let [element (first src)]
(recur (assoc dest element element) (rest src))
dest))
#'user/recurs
user=> (count (recurs {} (range 0 20000)))
20000
user=> (defn transi [dest src]
(let [temp (transient dest)]
(doseq [x src]
(assoc! temp x x))
(persistent! temp)))
#'user/transi
user=> (count (transi {} (range 0 20000)))
8
user=> (count (transi {} (range 0 20)))
8
user=> (count (transi {} (range 0 8)))
8
user=> (count (transi {} (range 0 7)))
7
Any ideas about why the first function does not behave the same as the
second?
Thanks
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