Programming-Idioms

Edit summary for version 41 by anon20171221:
[Clojure] comment/explain-stuff formatting

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2017-12-21, 02:59:25

2017-12-21, 03:00:11

Idiom #31 Recursive factorial (simple)

Create recursive function f which returns the factorial of non-negative integer i, calculated from f(i-1)

Create recursive function f which returns the factorial of non-negative integer i, calculated from f(i-1)

(defn f [i]
  (loop [i i acc 1N]
    (if (zero? i)
      acc
      (recur (dec i) (* i acc)))))

(defn f [i]
  (loop [i i acc 1N]
    (if (zero? i)
      acc
      (recur (dec i) (* i acc)))))

This supports arbitrary-precision.
Replace 1N (clojure.lang.BigInt) with 1 (java.lang.Long) if you don't need to calculate anything above _(f 20) .

This supports arbitrary-precision.
Replace 1N (clojure.lang.BigInt) with 1 (java.lang.Long) if you don't need to calculate anything above (f 20).

https://repl.it/repls/SerpentineFunnyYnambu

https://repl.it/repls/SerpentineFunnyYnambu

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