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author | Peter Bengtsson <mail@peterbe.com> | 2020-12-08 14:40:17 -0500 |
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committer | Peter Bengtsson <mail@peterbe.com> | 2020-12-08 14:40:17 -0500 |
commit | 33058f2b292b3a581333bdfb21b8f671898c5060 (patch) | |
tree | 51c3e392513ec574331b2d3f85c394445ea803c6 /files/ja/glossary/undefined | |
parent | 8b66d724f7caf0157093fb09cfec8fbd0c6ad50a (diff) | |
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diff --git a/files/ja/glossary/undefined/index.html b/files/ja/glossary/undefined/index.html new file mode 100644 index 0000000000..0d6330ed09 --- /dev/null +++ b/files/ja/glossary/undefined/index.html @@ -0,0 +1,31 @@ +--- +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> |