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  <author_name>letitride</author_name>
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  <blog_title>追憶行</blog_title>
  <blog_url>https://www.letitride.jp/</blog_url>
  <categories>
    <anon>テック</anon>
    <anon>テック-Haskell</anon>
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  <description>型の確認 ghci&gt; :t 'a' 'a' :: Char ghci&gt; :t 1 1 :: Num p =&gt; p ghci&gt; :t &quot;string&quot; &quot;string&quot; :: [Char] ghci&gt; :t True True :: Bool ghci&gt; :t [1,2] [1,2] :: Num a =&gt; [a] ghci&gt; :t (1,2) (1,2) :: (Num a, Num b) =&gt; (a, b) 関数の型宣言 文字列を受け取り、文字列を返す、型宣言。 removeNonUppercase.hs removeNonUppercase :: [Char] -&gt; [Char] remo…</description>
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  <provider_name>Hatena Blog</provider_name>
  <provider_url>https://hatena.blog</provider_url>
  <published>2020-05-04 10:06:52</published>
  <title>Haskell 型変数と型クラス</title>
  <type>rich</type>
  <url>https://www.letitride.jp/entry/2020/05/04/100652</url>
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