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authorRyan Johnson <rjohnson@mozilla.com>2021-04-29 16:16:42 -0700
committerGitHub <noreply@github.com>2021-04-29 16:16:42 -0700
commit95aca4b4d8fa62815d4bd412fff1a364f842814a (patch)
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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>