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[SWIMATH2]

https://guide.elm-lang.org/error_handling/ から

[naka-06_18]

例外についての記事？

[goodstoriez]

“The reasoning is that I consider exceptions to be no better than “goto’s”, considered harmful since the 1960s”

[fubar_foo]

コンストラクタでは戻り値によるチェックができないが，それ以外の部分では戻り値で管理した方が明示的にエラーを処理できるという利点がある．