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authorMDN <actions@users.noreply.github.com>2021-06-23 00:34:06 +0000
committerMDN <actions@users.noreply.github.com>2021-06-23 00:34:06 +0000
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----
-title: 'Map.prototype[@@iterator]()'
-slug: Web/JavaScript/Reference/Global_Objects/Map/@@iterator
-tags:
- - ECMAScript 2015
- - Iterator
- - JavaScript
- - Map
- - Method
- - Prototype
- - Reference
-translation_of: Web/JavaScript/Reference/Global_Objects/Map/@@iterator
----
-<div>{{JSRef}}</div>
-
-<p class="seoSummary"><strong><code>@@iterator</code></strong> プロパティの初期値は、 {{jsxref("Map.prototype.entries()", "entries")}} メソッドの初期値と同じ関数オブジェクトです。</p>
-
-<div>{{EmbedInteractiveExample("pages/js/map-prototype-@@iterator.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>[Symbol.iterator]</pre>
-
-<h3 id="Return_value" name="Return_value">返値</h3>
-
-<p>マップの <strong>iterator</strong> 関数で、既定では {{jsxref("Map.prototype.entries()", "entries()")}} 関数です。</p>
-
-<h2 id="Examples" name="Examples">例</h2>
-
-<h3 id="Using_iterator" name="Using_iterator">[@@iterator]() の使用</h3>
-
-<pre class="brush:js notranslate">const myMap = new Map()
-myMap.set('0', 'foo')
-myMap.set(1, 'bar')
-myMap.set({}, 'baz')
-
-const mapIter = myMap[Symbol.iterator]()
-
-console.log(mapIter.next().value) // ["0", "foo"]
-console.log(mapIter.next().value) // [1, "bar"]
-console.log(mapIter.next().value) // [Object, "baz"]
-</pre>
-
-<h3 id="Using_iterator_with_for..of" name="Using_iterator_with_for..of">[@@iterator]() と for..of の併用</h3>
-
-<pre class="brush: js notranslate">const myMap = new Map()
-myMap.set('0', 'foo')
-myMap.set(1, 'bar')
-myMap.set({}, 'baz')
-
-for (const entry of myMap) {
- console.log(entry)
-}
-// ["0", "foo"]
-// [1, "bar"]
-// [{}, "baz"]
-
-for (const [key, value] of myMap) {
- console.log(`${key}: ${value}`)
-}
-// 0: foo
-// 1: bar
-// [Object]: baz
-</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-@@iterator', 'Map.prototype[@@iterator]()')}}</td>
- </tr>
- </tbody>
-</table>
-
-<h2 id="Browser_compatibility" name="Browser_compatibility">ブラウザーの互換性</h2>
-
-<div class="hidden">このページの互換性一覧表は構造化データから生成されています。データに協力していただけるのであれば、 <a class="external" href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> をチェックアウトしてプルリクエストを送信してください。</div>
-
-<p>{{Compat("javascript.builtins.Map.@@iterator")}}</p>
-
-<h2 id="See_also" name="See_also">関連情報</h2>
-
-<ul>
- <li>{{jsxref("Map.prototype.entries()")}}</li>
- <li>{{jsxref("Map.prototype.keys()")}}</li>
- <li>{{jsxref("Map.prototype.values()")}}</li>
-</ul>