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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
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----
-title: Function.length
-slug: Web/JavaScript/Reference/Global_Objects/Function/length
-translation_of: Web/JavaScript/Reference/Global_Objects/Function/length
----
-<div>{{JSRef}}</div>
-
-<p>La proprietà <code><strong>length</strong></code> indica il numero di parametri che la funzione si aspetta di ricevere.</p>
-
-<p>{{EmbedInteractiveExample("pages/js/function-length.html")}}</p>
-
-
-
-<div>{{js_property_attributes(0,0,1)}}</div>
-
-<h2 id="Description">Description</h2>
-
-<p><code>length</code> è una proprietà di un oggetto {{jsxref("Function")}} che indica quanti argomenti la funzione si aspetta, cioè il numero di parametri formali. Questo numero esclude il {{jsxref("rest_parameters", "rest parameter", "", 1)}} e include solo i parametri prima del primo con un valore predefinito. Al contrario, {{jsxref("Functions_and_function_scope/arguments/length", "arguments.length")}} è locale a una funzione e fornisce il numero di argomenti effettivamente passati alla funzione.</p>
-
-<h3 id="Data_property_of_the_Function_constructor">Data property of the Function constructor</h3>
-
-<p>Il costruttore  {{jsxref("Function")}} è esso stesso un oggetto {{jsxref("Function")}}. La sua proprietà <code>length</code> ha valore 1. Gli attributi delle proprietà sono: Writable: <code>false</code>, Enumerable: <code>false</code>, Configurable: <code>false</code>.</p>
-
-<h3 id="Property_of_the_Function_prototype_object">Property of the Function prototype object</h3>
-
-<p>La proprietà <code>length</code> del prototype di un oggetto {{jsxref("Function")}} ha valore 0.</p>
-
-<h2 id="Examples">Examples</h2>
-
-<pre class="brush: js">console.log(Function.length); /* 1 */
-
-console.log((function() {}).length); /* 0 */
-console.log((function(a) {}).length); /* 1 */
-console.log((function(a, b) {}).length); /* 2 etc. */
-
-console.log((function(...args) {}).length);
-// 0, rest parameter is not counted
-
-console.log((function(a, b = 1, c) {}).length);
-// 1, only parameters before the first one with
-// a default value is counted</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('ES1')}}</td>
- <td>{{Spec2('ES1')}}</td>
- <td>Definizione iniziale. Implementata in JavaScript 1.1.</td>
- </tr>
- <tr>
- <td>{{SpecName('ES5.1', '#sec-15.3.5.1', 'Function.length')}}</td>
- <td>{{Spec2('ES5.1')}}</td>
- <td></td>
- </tr>
- <tr>
- <td>{{SpecName('ES6', '#sec-function-instances-length', 'Function.length')}}</td>
- <td>{{Spec2('ES6')}}</td>
- <td>Gli attributi <font face="consolas, Liberation Mono, courier, monospace"><span style="background-color: rgba(220, 220, 220, 0.5);">configurabili</span></font> di queste proprietà diventano <code>true</code>.</td>
- </tr>
- <tr>
- <td>{{SpecName('ESDraft', '#sec-function-instances-length', 'Function.length')}}</td>
- <td>{{Spec2('ESDraft')}}</td>
- <td></td>
- </tr>
- </tbody>
-</table>
-
-<h2 id="Browser_compatibility">Browser compatibility</h2>
-
-<div>
-
-
-<p>{{Compat("javascript.builtins.Function.length")}}</p>
-</div>
-
-<h2 id="See_also">See also</h2>
-
-<ul>
- <li>{{jsxref("Function")}}</li>
-</ul>