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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: 左シフト代入 (<<=)
+slug: Web/JavaScript/Reference/Operators/Left_shift_assignment
+tags:
+ - Assignment operator
+ - JavaScript
+ - Language feature
+ - Operator
+ - Reference
+translation_of: Web/JavaScript/Reference/Operators/Left_shift_assignment
+---
+<div>{{jsSidebar("Operators")}}</div>
+
+<p>左シフト代入演算子 (<code>&lt;&lt;=</code>) は、指定された量のビットを左に移動し、結果を変数に代入します。</p>
+
+<div>{{EmbedInteractiveExample("pages/js/expressions-left-shift-assignment.html")}}</div>
+
+<div></div>
+
+
+
+<h2 id="構文">構文</h2>
+
+<pre class="syntaxbox notranslate"><strong>Operator:</strong> x &lt;&lt;= y
+<strong>Meaning:</strong> x = x &lt;&lt; y</pre>
+
+<h2 id="例">例</h2>
+
+<h3 id="左シフト代入の使用">左シフト代入の使用</h3>
+
+<pre class="brush: js notranslate">let a = 5;
+// 00000000000000000000000000000101
+
+bar &lt;&lt;= 2; // 20
+// 00000000000000000000000000010100</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-assignment-operators', 'Assignment operators')}}</td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="ブラウザー実装状況">ブラウザー実装状況</h2>
+
+
+
+<p>{{Compat("javascript.operators.left_shift_assignment")}}</p>
+
+<h2 id="関連項目">関連項目</h2>
+
+<ul>
+ <li><a href="/docs/Web/JavaScript/Guide/Expressions_and_Operators#Assignment">代入演算子</a></li>
+ <li><a href="/docs/Web/JavaScript/Reference/Operators/Left_shift">左シフト演算子</a></li>
+</ul>