---
title: Set.prototype.has()
slug: Web/JavaScript/Reference/Global_Objects/Set/has
tags:
  - ECMAScript 2015
  - JavaScript
  - Method
  - Prototype
  - Reference
  - set
translation_of: Web/JavaScript/Reference/Global_Objects/Set/has
---
<div>{{JSRef}}</div>

<p><code><strong>has()</strong></code> 메서드는 <code>Set</code> 객체에 주어진 요소가 존재하는지 여부를 판별해 반환합니다.</p>

<div>{{EmbedInteractiveExample("pages/js/set-prototype-has.html")}}</div>



<h2 id="구문">구문</h2>

<pre class="syntaxbox"><em>mySet</em>.has(<em>value</em>);</pre>

<h3 id="매개변수">매개변수</h3>

<dl>
 <dt><code>value</code></dt>
 <dd><code>Set</code> 객체에서 존재 여부를 판별할 값.</dd>
</dl>

<h3 id="반환_값">반환 값</h3>

<p><code>Set</code> 객체에 값이 존재하면 <code>true</code>, 아니면 <code>false</code>.</p>

<div class="blockIndicator note">
<p><strong>참고:</strong> 기술적으로, <code>has()</code>는 <a href="/ko/docs/Web/JavaScript/Equality_comparisons_and_sameness#등가0_같음"><code>sameValueZero</code></a> 알고리즘을 사용해 요소의 존재 여부를 판별합니다.</p>
</div>

<h2 id="예제">예제</h2>

<h3 id="has()_사용하기"><code>has()</code> 사용하기</h3>

<pre class="brush: js">var mySet = new Set();
mySet.add('foo');

mySet.has('foo');  // true
mySet.has('bar');  // false

var set1 = new Set();
var obj1 = {'key1': 1};
set1.add(obj1);

set1.has(obj1);        // true
set1.has({'key1': 1}); // false, 형태만 같은 서로 다른 객체의 참조이기 때문
set1.add({'key1': 1}); // set1의 요소가 2개로 늘어남
</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-set.prototype.has', 'Set.prototype.has')}}</td>
   <td>{{Spec2('ES2015')}}</td>
   <td>Initial definition.</td>
  </tr>
  <tr>
   <td>{{SpecName('ESDraft', '#sec-set.prototype.has', 'Set.prototype.has')}}</td>
   <td>{{Spec2('ESDraft')}}</td>
   <td> </td>
  </tr>
 </tbody>
</table>

<h2 id="브라우저_호환성">브라우저 호환성</h2>



<p>{{Compat("javascript.builtins.Set.has")}}</p>

<h2 id="같이_보기">같이 보기</h2>

<ul>
 <li>{{jsxref("Set")}}</li>
 <li>{{jsxref("Set.prototype.add()")}}</li>
 <li>{{jsxref("Set.prototype.delete()")}}</li>
</ul>