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authorPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
committerPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
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+---
+title: undefined
+slug: Glossary/undefined
+tags:
+ - CodingScripting
+ - Glossary
+ - JavaScript
+ - NeedsContent
+translation_of: Glossary/undefined
+---
+<p><span class="seoSummary"><code>undefined</code>は、宣言のみが行われた{{glossary("variable", "変数")}}、あるいは実{{Glossary("Argument","引数")}}が存在しない仮引数に自動的に割り当てられる{{Glossary("primitive", "プリミティブ値")}}のことです。</span></p>
+
+<h2 id="例">例</h2>
+
+<pre class="brush: js">var x; //値を代入しない変数
+
+console.log("x's value is", x) //ログ:"x's value is undefined"</pre>
+
+<h2 id="関連情報">関連情報</h2>
+
+<h3 id="一般知識">一般知識</h3>
+
+<ul>
+ <li>Wikipedia 上の記事「<a href="http://en.wikipedia.org/wiki/Undefined%20value">Undefined value</a>(英語)」</li>
+</ul>
+
+<h3 id="Technical_reference" name="Technical_reference">技術リファレンス</h3>
+
+<ul>
+ <li><a href="/ja/docs/Web/JavaScript/Data_structures">JavaScript のデータ型とデータ構造</a></li>
+</ul>