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[CH12](p.262) Just가 사라지는 이유? #76

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py6578 opened this issue Apr 6, 2024 · 1 comment

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py6578 commented Apr 6, 2024

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zlqhem commented Apr 13, 2024

ghci> :t F.foldr F.foldr :: (F.Foldable t) => (a -> b -> b) -> b -> t a -> b

"the foldr from Data.Foldable accepts any type that can be folded.."

Maybe 도 Foldable 인데 F.foldr 이 알맹이 가져가서 연산한결과를 뱉어서 그런가봐요

Just 9 대신 Nothing 넣으면 결과가 어떻게되나요?

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