From 33058f2b292b3a581333bdfb21b8f671898c5060 Mon Sep 17 00:00:00 2001
From: Peter Bengtsson <mail@peterbe.com>
Date: Tue, 8 Dec 2020 14:40:17 -0500
Subject: initial commit

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+---
+title: デクリメント (--)
+slug: Web/JavaScript/Reference/Operators/Decrement
+tags:
+  - Decrement
+  - JavaScript
+  - Language feature
+  - Operator
+translation_of: Web/JavaScript/Reference/Operators/Decrement
+---
+<div>{{jsSidebar("Operators")}}</div>
+
+<p>デクリメント演算子 (<code>--</code>) は、オペランドをデクリメント (1を減算) して値を返します。</p>
+
+<div>{{EmbedInteractiveExample("pages/js/expressions-decrement.html")}}</div>
+
+<div></div>
+
+
+
+<h2 id="構文">構文</h2>
+
+<pre class="syntaxbox notranslate"><strong>Operator:</strong> <var>x</var>-- or --<var>x</var>
+</pre>
+
+<h2 id="解説">解説</h2>
+
+<p>オペランドに後置で演算子を付けると (例えば <code><var>x</var>--</code>)、デクリメント演算子はデクリメントしますが、デクリメント前の値を返します。</p>
+
+<p>オペランドに前置で演算子を付けると (例えば <code>--<var>x</var></code>)、デクリメント演算子はデクリメントし、デクリメント後の値を返します。</p>
+
+<h2 id="例">例</h2>
+
+<h3 id="後置デクリメント">後置デクリメント</h3>
+
+<pre class="brush: js notranslate">let x = 3;
+y = x--;
+
+// y = 3
+// x = 2
+</pre>
+
+<h3 id="前置デクリメント">前置デクリメント</h3>
+
+<pre class="brush: js notranslate">let a = 2;
+b = --a;
+
+// a = 1
+// b = 1
+</pre>
+
+<h2 id="仕様">仕様</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">仕様</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-postfix-decrement-operator', 'Decrement operator')}}</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="ブラウザーの互換性">ブラウザーの互換性</h2>
+
+
+
+<p>{{Compat("javascript.operators.decrement")}}</p>
+
+<h2 id="関連項目">関連項目</h2>
+
+<ul>
+ <li><a href="https://developer.mozilla.org/ja/docs/Web/JavaScript/Reference/Operators/Addition">加算演算子</a></li>
+ <li><a href="https://developer.mozilla.org/ja/docs/Web/JavaScript/Reference/Operators/Subtraction">減算演算子</a></li>
+ <li><a href="https://developer.mozilla.org/ja/docs/Web/JavaScript/Reference/Operators/Multiplication">乗算演算子</a></li>
+ <li><a href="https://developer.mozilla.org/ja/docs/Web/JavaScript/Reference/Operators/Division">除算演算子</a></li>
+ <li><a href="https://developer.mozilla.org/ja/docs/Web/JavaScript/Reference/Operators/Remainder">剰余演算子</a></li>
+ <li><a href="https://developer.mozilla.org/ja/docs/Web/JavaScript/Reference/Operators/Exponentiation">べき乗演算子</a></li>
+ <li><a href="https://developer.mozilla.org/ja/docs/Web/JavaScript/Reference/Operators/Increment">インクリメント演算子</a></li>
+ <li><a href="https://developer.mozilla.org/ja/docs/Web/JavaScript/Reference/Operators/Unary_negation">単項マイナス演算子</a></li>
+ <li><a href="https://developer.mozilla.org/ja/docs/Web/JavaScript/Reference/Operators/Unary_plus">単項プラス演算子</a></li>
+</ul>
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