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@erin

HaskellでElixirのようなパイプラインで記述したいとき

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関数合成の本来の目的は置いておいて、関数合成の記述よりElixirのパイプラインの記述の方が分かりやすい気がしたので。

【関数合成の記述】

someFunc :: IO ()
someFunc = do
  let a = sum . take 5 . reverse . map (*3) $ [1..10]
  print a

【パイプラインの記述】

someFunc :: IO ()
someFunc = do
  let a = [1..10]
          |> map (*3)
          |> reverse
          |> take 5
          |> sum
  print a

infixl 0 |>
(|>) :: a -> (a -> b) -> b
(|>) = flip ($)
--a |> f = f a

勉強会では関数合成の記述は英語の順序で、パイプラインの記述は日本語の順序だから、日本人にはパイプラインの方が馴染みやすいのではという意見も。。。

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