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+---
+title: Reflect.isExtensible()
+slug: Web/JavaScript/Reference/Global_Objects/Reflect/isExtensible
+tags:
+  - ECMAScript 2015
+  - JavaScript
+  - Method
+  - Reference
+  - Reflect
+translation_of: Web/JavaScript/Reference/Global_Objects/Reflect/isExtensible
+---
+<div>{{JSRef}}</div>
+
+<p><span class="seoSummary"><code><strong>Reflect</strong></code><strong><code>.isExtensible()</code></strong> 정적 메서드는 객체의 확장 가능 여부, 즉 속성을 추가할 수 있는지 판별합니다.</span> {{jsxref("Object.isExtensible()")}}과 유사하지만 {{anch("Object.isExtensible()과의 차이", "차이점")}}도 있습니다.</p>
+
+<div>{{EmbedInteractiveExample("pages/js/reflect-isextensible.html", "taller")}}</div>
+
+
+
+<h2 id="구문">구문</h2>
+
+<pre class="syntaxbox">Reflect.isExtensible(<em>target</em>)
+</pre>
+
+<h3 id="매개변수">매개변수</h3>
+
+<dl>
+ <dt><code>target</code></dt>
+ <dd>확장 가능 여부를 판별할 대상 객체.</dd>
+</dl>
+
+<h3 id="반환_값">반환 값</h3>
+
+<p>객체의 확장 가능 여부를 나타내는 {{jsxref("Boolean")}}.</p>
+
+<h3 id="예외">예외</h3>
+
+<p><code>target</code>이 {{jsxref("Object")}}가 아니면 {{jsxref("TypeError")}}.</p>
+
+<h2 id="설명">설명</h2>
+
+<p><code>Reflect.isExtensible()</code> 메서드는 {{jsxref("Object.isExtensible()")}}와 유사하게, 객체에 새로운 속성을 추가할 수 있는지 판별합니다.</p>
+
+<h2 id="예제">예제</h2>
+
+<h3 id="Reflect.isExtensible()_사용하기"><code>Reflect.isExtensible()</code> 사용하기</h3>
+
+<p>{{jsxref("Object.isExtensible()")}}도 참고하세요.</p>
+
+<pre class="brush: js">// 새로운 객체는 확장 가능
+var empty = {};
+Reflect.isExtensible(empty); // === true
+
+// ...하지만 바꿀 수 있음
+Reflect.preventExtensions(empty);
+Reflect.isExtensible(empty); // === false
+
+// 봉인한 객체는 확장 불가능함
+var sealed = Object.seal({});
+Reflect.isExtensible(sealed); // === false
+
+// 동결한 객체도 확장 불가능함
+var frozen = Object.freeze({});
+Reflect.isExtensible(frozen); // === false
+</pre>
+
+<h3 id="Object.isExtensible()과의_차이점"><code>Object.isExtensible()</code>과의 차이점</h3>
+
+<p><code>Reflect.isExtensible()</code>은 첫 번째 매개변수가 {{glossary("Primitive", "원시값")}}이면 {{jsxref("TypeError")}}를 던집니다. 반면 {{jsxref("Object.isExtensible()")}}은 우선 객체로 변환을 시도합니다.</p>
+
+<pre class="brush: js">Reflect.isExtensible(1);
+// TypeError: 1 is not an object
+
+Object.isExtensible(1);
+// false
+</pre>
+
+<h2 id="명세">명세</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">Specification</th>
+   <th scope="col">Status</th>
+   <th scope="col">Comment</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES2015', '#sec-reflect.isextensible', 'Reflect.isExtensible')}}</td>
+   <td>{{Spec2('ES2015')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-reflect.isextensible', 'Reflect.isExtensible')}}</td>
+   <td>{{Spec2('ESDraft')}}</td>
+   <td> </td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="브라우저_호환성">브라우저 호환성</h2>
+
+
+
+<p>{{Compat("javascript.builtins.Reflect.isExtensible")}}</p>
+
+<h2 id="같이_보기">같이 보기</h2>
+
+<ul>
+ <li>{{jsxref("Reflect")}}</li>
+ <li>{{jsxref("Object.isExtensible()")}}</li>
+</ul>