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.prototype.includes()
+slug: Web/JavaScript/Reference/Global_Objects/Array/includes
+translation_of: Web/JavaScript/Reference/Global_Objects/Array/includes
+---
+<div>{{JSRef}}</div>
+
+<p>Il metodo <code><strong>includes()</strong></code> determina se un array include un certo elemento, ritornando <code>true</code> o <code>false</code> a seconda del caso</p>
+
+<h2 id="Sintassi">Sintassi</h2>
+
+<pre class="syntaxbox">var <var>boolean</var> = <var>array</var>.includes(<var>searchElement</var>[, <var>fromIndex</var>])</pre>
+
+<h3 id="Parametri">Parametri</h3>
+
+<dl>
+ <dt><code>searchElement</code></dt>
+ <dd>L'elemento da cercare.</dd>
+ <dt><code>fromIndex</code></dt>
+ <dd>Opzionale. La posizione nell'array da cui partire per cercare l'elemento <code>searchElement</code>. Un valore negativo ricerca dal valore di <code>array.length + fromIndex</code> in maniera ascendente. Il valore di default è 0.</dd>
+</dl>
+
+<h3 id="Valore_di_ritorno">Valore di ritorno</h3>
+
+<p>Un {{jsxref("Boolean")}}.</p>
+
+<h2 id="Examples">Examples</h2>
+
+<pre class="brush: js">[1, 2, 3].includes(2);     // true
+[1, 2, 3].includes(4);     // false
+[1, 2, 3].includes(3, 3);  // false
+[1, 2, 3].includes(3, -1); // true
+[1, 2, NaN].includes(NaN); // true
+</pre>
+
+<h2 id="Polyfill">Polyfill</h2>
+
+<pre class="brush: js">if (!Array.prototype.includes) {
+  Array.prototype.includes = function(searchElement /*, fromIndex*/) {
+    'use strict';
+    if (this == null) {
+      throw new TypeError('Array.prototype.includes called on null or undefined');
+    }
+
+    var O = Object(this);
+    var len = parseInt(O.length, 10) || 0;
+    if (len === 0) {
+      return false;
+    }
+    var n = parseInt(arguments[1], 10) || 0;
+    var k;
+    if (n &gt;= 0) {
+      k = n;
+    } else {
+      k = len + n;
+      if (k &lt; 0) {k = 0;}
+    }
+    var currentElement;
+    while (k &lt; len) {
+      currentElement = O[k];
+      if (searchElement === currentElement ||
+         (searchElement !== searchElement &amp;&amp; currentElement !== currentElement)) { // NaN !== NaN
+        return true;
+      }
+      k++;
+    }
+    return false;
+  };
+}
+</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('ES7', '#sec-array.prototype.includes', 'Array.prototype.includes')}}</td>
+   <td>{{Spec2('ES7')}}</td>
+   <td>Definizione iniziale.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-array.prototype.includes', 'Array.prototype.includes')}}</td>
+   <td>{{Spec2('ESDraft')}}</td>
+   <td> </td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility">Browser compatibility</h2>
+
+<div>{{CompatibilityTable}}</div>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Chrome</th>
+   <th>Firefox (Gecko)</th>
+   <th>Internet Explorer</th>
+   <th>Edge</th>
+   <th>Opera</th>
+   <th>Safari</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>
+    <p>{{CompatChrome(47)}}</p>
+   </td>
+   <td>43</td>
+   <td>{{CompatNo}}</td>
+   <td>14279+</td>
+   <td>34</td>
+   <td>9</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Android</th>
+   <th>Android Webview</th>
+   <th>Firefox Mobile (Gecko)</th>
+   <th>IE Mobile</th>
+   <th>Opera Mobile</th>
+   <th>Safari Mobile</th>
+   <th>Chrome for Android</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{CompatNo}}</td>
+   <td>
+    <p>{{CompatChrome(47)}}</p>
+   </td>
+   <td>43</td>
+   <td>{{CompatNo}}</td>
+   <td>34</td>
+   <td>9</td>
+   <td>
+    <p>{{CompatChrome(47)}}</p>
+   </td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="Vedi_anche">Vedi anche</h2>
+
+<ul>
+ <li>{{jsxref("TypedArray.prototype.includes()")}}</li>
+ <li>{{jsxref("String.prototype.includes()")}}</li>
+ <li>{{jsxref("Array.prototype.indexOf()")}}</li>
+</ul>
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