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Diffstat (limited to 'files/ja/web/javascript/reference/global_objects/map/clear')
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1 files changed, 71 insertions, 0 deletions
diff --git a/files/ja/web/javascript/reference/global_objects/map/clear/index.html b/files/ja/web/javascript/reference/global_objects/map/clear/index.html new file mode 100644 index 0000000000..3518878ab6 --- /dev/null +++ b/files/ja/web/javascript/reference/global_objects/map/clear/index.html @@ -0,0 +1,71 @@ +--- +title: Map.prototype.clear() +slug: Web/JavaScript/Reference/Global_Objects/Map/clear +tags: + - ECMAScript 2015 + - JavaScript + - Map + - Method + - Prototype + - Reference +translation_of: Web/JavaScript/Reference/Global_Objects/Map/clear +original_slug: Web/JavaScript/Reference/Global_Objects/Map/clear +--- +<div>{{JSRef}}</div> + +<p><strong><code>clear()</code></strong> メソッドは <code>Map</code> オブジェクトからすべての要素を削除します。</p> + +<div>{{EmbedInteractiveExample("pages/js/map-prototype-clear.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>.clear(); +</pre> + +<h3 id="Return_value" name="Return_value">返値</h3> + +<p>{{jsxref("undefined")}}.</p> + +<h2 id="Examples" name="Examples">例</h2> + +<h3 id="Using_clear" name="Using_clear">clear() の使用</h3> + +<pre class="brush: js notranslate">var myMap = new Map(); +myMap.set('bar', 'baz'); +myMap.set(1, 'foo'); + +myMap.size; // 2 +myMap.has('bar'); // true + +myMap.clear(); + +myMap.size; // 0 +myMap.has('bar') // false +</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.clear', 'Map.prototype.clear')}}</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.clear")}}</p> + +<h2 id="See_also" name="See_also">関連情報</h2> + +<ul> + <li>{{jsxref("Map")}}</li> +</ul> |
