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First class environments: Difference between revisions
→{{header|C}}
SqrtNegInf (talk | contribs) m (→{{header|Sidef}}: Fix link: Perl 6 --> Raku) |
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COUNTS:
0 1 7 2 5 8 16 3 19 6 14 9
</pre>
=={{header|Clojure}}==
<lang Clojure>
(def hailstone-src
"(defn hailstone-step [env]
(let [{:keys[n cnt]} env]
(cond
(= n 1) {:n 1 :cnt cnt}
(even? n) {:n (/ n 2) :cnt (inc cnt)}
:else {:n (inc (* n 3)) :cnt (inc cnt)})))")
(defn create-hailstone-table [f-src]
(let [done? (fn [e] (= (:n e) 1))
print-step (fn [envs] (println (map #(format "%4d" (:n %)) envs)))
print-counts (fn [envs] (println "Counts:\n"
(map #(format "%4d" (:cnt %)) envs)))]
(loop [f (eval (read-string f-src))
envs (for [n (range 12)]
{:n (inc n) :cnt 0})]
(if (every? done? envs)
(print-counts envs)
(do
(print-step envs)
(recur f (map f envs)))))))
</lang>
{{out}}
<pre>
( 1 2 3 4 5 6 7 8 9 10 11 12)
( 1 1 10 2 16 3 22 4 28 5 34 6)
( 1 1 5 1 8 10 11 2 14 16 17 3)
( 1 1 16 1 4 5 34 1 7 8 52 10)
( 1 1 8 1 2 16 17 1 22 4 26 5)
( 1 1 4 1 1 8 52 1 11 2 13 16)
( 1 1 2 1 1 4 26 1 34 1 40 8)
( 1 1 1 1 1 2 13 1 17 1 20 4)
( 1 1 1 1 1 1 40 1 52 1 10 2)
( 1 1 1 1 1 1 20 1 26 1 5 1)
( 1 1 1 1 1 1 10 1 13 1 16 1)
( 1 1 1 1 1 1 5 1 40 1 8 1)
( 1 1 1 1 1 1 16 1 20 1 4 1)
( 1 1 1 1 1 1 8 1 10 1 2 1)
( 1 1 1 1 1 1 4 1 5 1 1 1)
( 1 1 1 1 1 1 2 1 16 1 1 1)
( 1 1 1 1 1 1 1 1 8 1 1 1)
( 1 1 1 1 1 1 1 1 4 1 1 1)
( 1 1 1 1 1 1 1 1 2 1 1 1)
Counts:
( 0 1 7 2 5 8 16 3 19 6 14 9)
</pre>
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