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authorPeter Bengtsson <mail@peterbe.com>2021-07-23 11:06:19 -0400
committerGitHub <noreply@github.com>2021-07-23 11:06:19 -0400
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wasn't supposed to be orphaned (ja) (#1672)
* wasn't supposed to be orphaned (ja) * fix redirects * fix slug front-matter
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+---
+title: Map.prototype.keys()
+slug: Web/JavaScript/Reference/Global_Objects/Map/keys
+tags:
+ - ECMAScript 2015
+ - Iterator
+ - JavaScript
+ - Map
+ - Method
+ - Prototype
+translation_of: Web/JavaScript/Reference/Global_Objects/Map/keys
+original_slug: Web/JavaScript/Reference/Global_Objects/Map/keys
+---
+<div>{{JSRef}}</div>
+
+<p><strong><code>keys()</code></strong> メソッドは、 <code>Map</code> オブジェクトに挿入された要素のキーを挿入順に列挙する新しい<strong><a href="/ja/docs/Web/JavaScript/Guide/Iterators_and_Generators">イテレーター</a></strong>オブジェクトを返します。</p>
+
+<div>{{EmbedInteractiveExample("pages/js/map-prototype-keys.html")}}</div>
+
+<div class="hidden">このデモのソースファイルは GitHub リポジトリに格納されています。デモプロジェクトに協力したい場合は、 <a href="https://github.com/mdn/interactive-examples">https://github.com/mdn/interactive-examples</a> をクローンしてプルリクエストを送信してください。</div>
+
+<h2 id="Syntax" name="Syntax">構文</h2>
+
+<pre class="syntaxbox notranslate"><var>myMap</var>.keys()</pre>
+
+<h3 id="Return_value" name="Return_value">返値</h3>
+
+<p>{{jsxref("Map")}} の新しいイテレーターオブジェクト。</p>
+
+<h2 id="Examples" name="Examples">例</h2>
+
+<h3 id="Using_keys" name="Using_keys">keys() の使用</h3>
+
+<pre class="brush:js notranslate">var myMap = new Map();
+myMap.set('0', 'foo');
+myMap.set(1, 'bar');
+myMap.set({}, 'baz');
+
+var mapIter = myMap.keys();
+
+console.log(mapIter.next().value); // "0"
+console.log(mapIter.next().value); // 1
+console.log(mapIter.next().value); // Object
+</pre>
+
+<h2 id="Specifications" name="Specifications">仕様書</h2>
+
+<table class="standard-table">
+ <thead>
+ <tr>
+ <th scope="col">仕様書</th>
+ </tr>
+ </thead>
+ <tbody>
+ <tr>
+ <td>{{SpecName('ESDraft', '#sec-map.prototype.keys', 'Map.prototype.keys')}}</td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility" name="Browser_compatibility">ブラウザーの互換性</h2>
+
+<p>{{Compat("javascript.builtins.Map.keys")}}</p>
+
+<h2 id="See_also" name="See_also">関連情報</h2>
+
+<ul>
+ <li>{{jsxref("Map.prototype.entries()")}}</li>
+ <li>{{jsxref("Map.prototype.values()")}}</li>
+</ul>