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多言語FizzBuzzAdvent Calendar 2022

Day 21

多言語FizzBuzzチャレンジ21日目:OCaml

Last updated at Posted at 2022-12-20

これまでのまとめ

本日のお品書き

なんだか一瞬Twitterで話題になったOCamlさん。

FizzBuzz

  • 関数型言語(だと思うん)だけどforもあることがわかったOCamlさん
  • いや、意地でもパターンマッチと再帰でやりくりしてみます
    • パターンマッチh::restでリストの先頭とそれ以外をデコンストラクションしている
fizzbuzz.ml
let rec fizzbuzz x =
    match x with
    | [] -> print_string ""
    | h::rest ->
        if h mod 15 = 0 then print_endline "FizzBuzz"
        else if h mod 3 = 0 then print_endline "Fizz"
        else if h mod 5 = 0 then print_endline "Buzz"
        else print_endline (string_of_int h);
        fizzbuzz(rest);;

(* Erlangのlists:seq(1,100)相当 ↓ *)
fizzbuzz (list.init 100 (fun x -> x+1));;

おまけ:実行方法

docker run --rm --mount type=bind,source=$(pwd),target=/app -w /app ocaml/opam ocaml fizzbuzz.ml
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