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  <author_name>yzn</author_name>
  <author_url>https://blog.hatena.ne.jp/yzn/</author_url>
  <blog_title>yzn’s memo</blog_title>
  <blog_url>https://yzn.hatenadiary.org/</blog_url>
  <categories>
    <anon>dev</anon>
    <anon>ruby</anon>
  </categories>
  <description>コマンド展開 OSによりコマンドとしいて実行される。末尾に改行が付く `echo aaa` =&gt; &quot;aaa\n&quot; %x{ echo &quot;aaa&quot; } =&gt; &quot;\&quot;aaa\&quot;\n&quot; def duration=(new_duration) puts &quot;new duration = #{new_duration}&quot; @duration = new_duration end end song = Song.new;song.duration = &quot;hogehoge&quot; 代入の返却値は破棄される。 class RetTest def hoge=(new_value) @value = new_value r…</description>
  <height>190</height>
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  <image_url></image_url>
  <provider_name>Hatena Blog</provider_name>
  <provider_url>https://hatena.blog</provider_url>
  <published>2007-09-07 00:00:00</published>
  <title>ruby学習メモ</title>
  <type>rich</type>
  <url>https://yzn.hatenadiary.org/entry/20070907/p1</url>
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