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  <author_name>tanakaBox</author_name>
  <author_url>https://blog.hatena.ne.jp/tanakaBox/</author_url>
  <blog_title>ボクノス</blog_title>
  <blog_url>https://boxnos.hatenablog.com/</blog_url>
  <categories>
    <anon>Scheme</anon>
  </categories>
  <description>unfoldが便利っぽい。メモメモgaucheのマニュアルを見ると、 Function: unfold p f g seed &amp;optional tail-gen [SRFI-1] 基本リスト再帰構築子です。以下のように再帰的に定義されています。 (unfold p f g seed tail-gen) == (if (p seed) (tail-gen seed) (cons (f seed) (unfold p f g (g seed)))) Function: unfold-right p f g seed &amp;optional tail [SRFI-1] 基本リスト反復構築子です。以下の…</description>
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  <image_url></image_url>
  <provider_name>Hatena Blog</provider_name>
  <provider_url>https://hatena.blog</provider_url>
  <published>2008-04-08 03:20:35</published>
  <title> unfoldのメモ</title>
  <type>rich</type>
  <url>https://boxnos.hatenablog.com/entry/20080408/1207592435</url>
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