From 074785cea106179cb3305637055ab0a009ca74f2 Mon Sep 17 00:00:00 2001
From: Peter Bengtsson <mail@peterbe.com>
Date: Tue, 8 Dec 2020 14:42:52 -0500
Subject: initial commit

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+---
+title: Set.prototype.has()
+slug: Web/JavaScript/Reference/Global_Objects/Set/has
+translation_of: Web/JavaScript/Reference/Global_Objects/Set/has
+---
+<div>{{JSRef}}</div>
+
+<p>Метод  <code><strong>has()</strong></code> возвращает логическое значение, показывающее, существует ли элемент с указанным значением в объекте  <code>Set</code> или нет.</p>
+
+<div>{{EmbedInteractiveExample("pages/js/set-prototype-has.html")}}</div>
+
+
+
+<h2 id="Syntax">Syntax</h2>
+
+<pre class="syntaxbox"><code><em>mySet</em>.has(value);</code></pre>
+
+<h3 id="Parameters">Parameters</h3>
+
+<dl>
+ <dt>value</dt>
+ <dd>Required. The value to test for presence in the <code>Set</code> object.</dd>
+</dl>
+
+<h3 id="Return_value">Return value</h3>
+
+<dl>
+ <dt>Boolean</dt>
+ <dd>
+ <p>Returns <code>true</code> if an element with the specified value exists in the <code>Set</code> object; otherwise <code>false</code>.</p>
+
+ <div class="note">
+ <p><strong>Note:</strong> Technically speaking, <code>has()</code> uses the <code><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Equality_comparisons_and_sameness#Same-value-zero_equality">sameValueZero</a></code> algorithm to determine whether the given element is found.</p>
+ </div>
+ </dd>
+</dl>
+
+<h2 id="Examples">Examples</h2>
+
+<h3 id="Using_the_has_method">Using the <code>has</code> method</h3>
+
+<pre class="brush: js">var mySet = new Set();
+mySet.add('foo');
+
+mySet.has('foo');  // returns true
+mySet.has('bar');  // returns false
+
+var set1 = new Set();
+var obj1 = {'key1': 1};
+set1.add(obj1);
+
+set1.has(obj1);        // returns true
+set1.has({'key1': 1}); // returns false because they are different object references
+set1.add({'key1': 1}); // now set1 contains 2 entries
+</pre>
+
+<h2 id="Specifications">Specifications</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="Browser_compatibility">Browser compatibility</h2>
+
+
+
+<p>{{Compat("javascript.builtins.Set.has")}}</p>
+
+<h2 id="See_also">See also</h2>
+
+<ul>
+ <li>{{jsxref("Set")}}</li>
+ <li>{{jsxref("Set.prototype.add()")}}</li>
+ <li>{{jsxref("Set.prototype.delete()")}}</li>
+</ul>
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