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  <author_name>sirocco</author_name>
  <author_url>https://blog.hatena.ne.jp/sirocco/</author_url>
  <blog_title>sirocco の書いてもすぐに忘れるメモ</blog_title>
  <blog_url>https://sirocco.hatenadiary.org/</blog_url>
  <categories>
    <anon>Haskell</anon>
  </categories>
  <description>nagate は Num 型の引数をひとつとり符号を反転させて返す関数。 &gt; :t negate negate :: (Num a) =&gt; a -&gt; a &gt; :i negate class (Eq a, Show a) =&gt; Num a where ... negate :: a -&gt; a ... -- Defined in GHC.Num &gt; negate 1 --=&gt; -1 &gt; negate $ negate 1 --=&gt; 1 &gt; negate $ negate $ negate 1 --=&gt; -1 (-) は最初の引数から二番目の引数を引いた値を返す関数 &gt; :t (-) (-) :: …</description>
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  <provider_name>Hatena Blog</provider_name>
  <provider_url>https://hatena.blog</provider_url>
  <published>2010-12-01 12:06:52</published>
  <title>negate (-)  - の違いは・・・？</title>
  <type>rich</type>
  <url>https://sirocco.hatenadiary.org/entry/20101201/1291172812</url>
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