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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.length
-slug: Web/JavaScript/Reference/Global_Objects/Array/length
-translation_of: Web/JavaScript/Reference/Global_Objects/Array/length
----
-<div>{{JSRef}}</div>
-
-<div>La proprieta' <strong>length</strong> setta o restituisce il numero di elementi in un array. E' un intero a 32 bit, sempre maggiore del piu' grande indice dell'array.</div>
-
-<div> </div>
-
-<pre class="brush: js">var items = ['shoes', 'shirts', 'socks', 'sweaters'];
-items.length;
-
-// returns 4</pre>
-
-<h2 id="Descrizione">Descrizione</h2>
-
-<p>Puoi impostare la proprietà <strong>length</strong> di un array per troncare o estendere l'array stesso.</p>
-
-<pre class="brush: js">var a = [1,2,3];
-a.length=2;
-// a is now [1, 2]
-
-a.length = 10
-// a is now [1, 2, undefined × 8]
-</pre>
-
-<h3 id="sect1"> </h3>
-
-<h2 id="Esempi">Esempi</h2>
-
-<h3 id="Iterare_su_un_array">Iterare su un array</h3>
-
-<p>Nel seguente esempio, l'array <em>numbers</em> viene iterarato e ciascun elemento viene moltiplicato per 2.</p>
-
-<pre class="brush: js">var numbers = [1, 2, 3, 4, 5];
-var length = numbers.length;
-for (var i = 0; i &lt; length; i++) {
- numbers[i] *= 2;
-}
-// numbers is now [2, 4, 6, 8, 10]
-</pre>
-
-<h3 id="Specifiche">Specifiche</h3>
-
-<table class="standard-table">
- <tbody>
- <tr>
- <th scope="col">Specifiche</th>
- <th scope="col">Stato</th>
- <th scope="col">Commento</th>
- </tr>
- <tr>
- <td>{{SpecName('ES1')}}</td>
- <td>{{Spec2('ES1')}}</td>
- <td>Definizione iniziale.</td>
- </tr>
- <tr>
- <td>{{SpecName('ES5.1', '#sec-15.4.5.2', 'Array.length')}}</td>
- <td>{{Spec2('ES5.1')}}</td>
- <td> </td>
- </tr>
- <tr>
- <td>{{SpecName('ES6', '#sec-properties-of-array-instances-length', 'Array.length')}}</td>
- <td>{{Spec2('ES6')}}</td>
- <td> </td>
- </tr>
- <tr>
- <td>{{SpecName('ESDraft', '#sec-properties-of-array-instances-length', 'Array.length')}}</td>
- <td>{{Spec2('ESDraft')}}</td>
- <td> </td>
- </tr>
- </tbody>
-</table>
-
-<h2 id="Compatibilità">Compatibilità</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>Opera</th>
- <th>Safari</th>
- </tr>
- <tr>
- <td>Basic support</td>
- <td>{{CompatVersionUnknown}}</td>
- <td>{{CompatVersionUnknown}}</td>
- <td>{{CompatVersionUnknown}}</td>
- <td>{{CompatVersionUnknown}}</td>
- <td>{{CompatVersionUnknown}}</td>
- </tr>
- </tbody>
-</table>
-</div>
-
-<div id="compat-mobile">
-<table class="compat-table">
- <tbody>
- <tr>
- <th>Feature</th>
- <th>Android</th>
- <th>Chrome for Android</th>
- <th>Firefox Mobile (Gecko)</th>
- <th>IE Mobile</th>
- <th>Opera Mobile</th>
- <th>Safari Mobile</th>
- </tr>
- <tr>
- <td>Basic support</td>
- <td>{{CompatVersionUnknown}}</td>
- <td>{{CompatVersionUnknown}}</td>
- <td>{{CompatVersionUnknown}}</td>
- <td>{{CompatVersionUnknown}}</td>
- <td>{{CompatVersionUnknown}}</td>
- <td>{{CompatVersionUnknown}}</td>
- </tr>
- </tbody>
-</table>
-</div>
-
-<h2 id="sect2"> </h2>