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+---
+title: Array.prototype.keys()
+slug: Web/JavaScript/Reference/Global_Objects/Array/keys
+tags:
+ - Array
+ - ECMAScript 2015
+ - Iterator
+ - JavaScript
+ - Method
+ - Prototype
+ - Reference
+translation_of: Web/JavaScript/Reference/Global_Objects/Array/keys
+---
+<div>{{JSRef}}</div>
+
+<p><code><strong>keys()</strong></code> 메서드는 배열의 각 인덱스를 키 값으로 가지는 새로운 <code><strong>Array Iterator</strong></code> 객체를 반환합니다.</p>
+
+<p>{{EmbedInteractiveExample("pages/js/array-keys.html")}}</p>
+
+<h2 id="구문">구문</h2>
+
+<pre class="syntaxbox"><code><var>arr</var>.keys()</code></pre>
+
+<h3 id="반환_값">반환 값</h3>
+
+<p>새로운 {{jsxref("Array")}} 반복기 객체.</p>
+
+<h2 id="예제">예제</h2>
+
+<h3 id="키_반복기는_빈_인덱스를_무시하지_않음">키 반복기는 빈 인덱스를 무시하지 않음</h3>
+
+<pre><code>var arr = ['a', , 'c'];
+var sparseKeys = Object.keys(arr);
+var denseKeys = [...arr.keys()];
+console.log(sparseKeys); // ['0', '2']
+console.log(denseKeys); // [0, 1, 2]</code></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('ES6', '#sec-array.prototype.keys', 'Array.prototype.keys')}}</td>
+ <td>{{Spec2('ES6')}}</td>
+ <td>Initial definition.</td>
+ </tr>
+ <tr>
+ <td>{{SpecName('ESDraft', '#sec-array.prototype.keys', 'Array.prototype.keys')}}</td>
+ <td>{{Spec2('ESDraft')}}</td>
+ <td> </td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="브라우저_호환성">브라우저 호환성</h2>
+
+<p>{{Compat("javascript.builtins.Array.keys")}}</p>
+
+<h2 id="같이_보기">같이 보기</h2>
+
+<ul>
+ <li>{{jsxref("Array.prototype.values()")}}</li>
+ <li>{{jsxref("Array.prototype.entries()")}}</li>
+</ul>