seen from United States
seen from United Kingdom
seen from China
seen from Kyrgyzstan
seen from United States
seen from United States
seen from United States
seen from China
seen from Germany
seen from Netherlands
seen from United Kingdom
seen from Malaysia
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seen from T1
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seen from United States
Point free Haskell. Compose function of 2 args.
concatMap f = concat . map f concatMap f = (.) concat (map f) -- 中置記法の関数合成演算子(おそらくこれも関数)を前に移動させただけ。わかる。 concatMap f = (((.) concat) . map) f -- ★ ここがわからない点！ concatMap = ((.) concat) . map -- 両辺の右端の f を省略しただけ concatMap = (concat . ) . map -- 普段中置記法の関数合成演算子が前にあるので後ろへ移動させただけ
