From da78a9e329e272dedb2400b79a3bdeebff387d47 Mon Sep 17 00:00:00 2001
From: Peter Bengtsson <mail@peterbe.com>
Date: Tue, 8 Dec 2020 14:42:17 -0500
Subject: initial commit

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+---
+title: Array.isArray()
+slug: Web/JavaScript/Reference/Global_Objects/Array/isArray
+tags:
+  - Array
+  - ECMAScript 5
+  - JavaScript
+  - Method
+  - Reference
+  - polyfill
+  - 자바스크립트
+  - 폴리필
+translation_of: Web/JavaScript/Reference/Global_Objects/Array/isArray
+---
+<div>{{JSRef}}</div>
+
+<p><code><strong>Array.isArray()</strong></code> 메서드는 인자가 {{jsxref("Array")}}인지 판별합니다.</p>
+
+<pre><code>Array.isArray([1, 2, 3]);  // true
+Array.isArray({foo: 123}); // false
+Array.isArray('foobar');   // false
+Array.isArray(undefined);  // false</code>
+</pre>
+
+<h2 id="구문">구문</h2>
+
+<pre class="syntaxbox"><code>Array.isArray(<var>obj</var>)</code></pre>
+
+<h3 id="매개변수">매개변수</h3>
+
+<dl>
+ <dt><code>obj</code></dt>
+ <dd>검사할 객체.</dd>
+</dl>
+
+<h3 id="반환_값">반환 값</h3>
+
+<p>객체가 {{jsxref("Array")}}라면 <code>true</code>, 아니라면 <code>false</code>.</p>
+
+<h2 id="설명">설명</h2>
+
+<p>객체가 {{jsxref("Array")}}라면 <code>true</code>를 반환하고, 아니라면 <code>false</code>를 반환합니다.</p>
+
+<p>자세한 정보는 <a href="http://web.mit.edu/jwalden/www/isArray.html">“Determining with absolute accuracy whether or not a JavaScript object is an array”</a>(자바스크립트 객체가 배열인지 정확히 판별하는 방법) 문서를 참조하세요.</p>
+
+<h2 id="예제">예제</h2>
+
+<pre><code>// 모두 true 반환
+Array.isArray([]);
+Array.isArray([1]);
+Array.isArray(new Array());
+Array.isArray(new Array('a', 'b', 'c', 'd'));
+Array.isArray(new Array(3));
+// Array.prototype은 스스로도 배열입니다
+Array.isArray(Array.prototype);
+
+// 모두 false 반환
+Array.isArray();
+Array.isArray({});
+Array.isArray(null);
+Array.isArray(undefined);
+Array.isArray(17);
+Array.isArray('Array');
+Array.isArray(true);
+Array.isArray(false);
+Array.isArray({ __proto__: Array.prototype });</code></pre>
+
+<h3 id="instanceof_vs_isArray"><code>instanceof</code> vs <code>isArray</code></h3>
+
+<p><code>Array</code> 객체를 판별할 때, <code>Array.isArray</code>는 <code>iframe</code>을 통해서도 작동하기 때문에 <code>instanceof</code> 보다 적합합니다.</p>
+
+<pre><code>var iframe = document.createElement('iframe');
+document.body.appendChild(iframe);
+xArray = window.frames[window.frames.length-1].Array;
+var arr = new xArray(1,2,3); // [1,2,3]
+
+// 올바른 Array 판별
+Array.isArray(arr);  // true
+// iframe을 통해서 작동하지 않기 때문에 올바르지 않은 방법
+arr instanceof Array; // false</code>
+</pre>
+
+<h2 id="폴리필">폴리필</h2>
+
+<p>아래 코드를 실행하면 지원하지 않는 환경에서도 <code>Array.isArray()</code>를 사용할 수 있습니다.</p>
+
+<pre class="brush: js">if (!Array.isArray) {
+  Array.isArray = function(arg) {
+    return Object.prototype.toString.call(arg) === '[object Array]';
+  };
+}
+</pre>
+
+<h2 id="명세">명세</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">명세</th>
+   <th scope="col">상태</th>
+   <th scope="col">주석</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES5.1', '#sec-15.4.3.2', 'Array.isArray')}}</td>
+   <td>{{Spec2('ES5.1')}}</td>
+   <td>초안. 자바스크립트 1.8.5 에 구현됨.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES6', '#sec-array.isarray', 'Array.isArray')}}</td>
+   <td>{{Spec2('ES6')}}</td>
+   <td>
+    <p> </p>
+   </td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-array.isarray', 'Array.isArray')}}</td>
+   <td>{{Spec2('ESDraft')}}</td>
+   <td> </td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="브라우저_호환성">브라우저 호환성</h2>
+
+<div>{{Compat("javascript.builtins.Array.isArray")}}</div>
+
+<h2 id="참고">참고</h2>
+
+<ul>
+ <li>{{jsxref("Array")}}</li>
+</ul>
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