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+---
+title: Boolean.prototype.valueOf()
+slug: Web/JavaScript/Reference/Global_Objects/Boolean/valueOf
+translation_of: Web/JavaScript/Reference/Global_Objects/Boolean/valueOf
+original_slug: Web/JavaScript/Referencia/Objectes_globals/Boolean/valueOf
+---
+<div>{{JSRef("Global_Objects", "Boolean")}}</div>
+
+<h2 id="Summary" name="Summary">Resum</h2>
+
+<p>El mètode <code><strong>valueOf()</strong></code> retorna el valor primitiu d'un objecte {{jsxref("Objectes_standard/Boolean", "Boolean")}}.</p>
+
+<h2 id="Syntax" name="Syntax">Sintaxi</h2>
+
+<pre class="syntaxbox"><code><var>bool</var>.valueOf()</code></pre>
+
+<h3 id="Parameters" name="Parameters">Paràmetres</h3>
+
+<p>Cap.</p>
+
+<h2 id="Description" name="Description">Descripció</h2>
+
+<p>El mètode <code>valueOf</code> pertanyent a {{jsxref("Objectes_standard/Boolean", "Boolean")}} retorna el valor primitiu d'un objecte o literal {{jsxref("Objectes_standard/Boolean", "Boolean")}} com a tipus de dada Boolean.</p>
+
+<p>Aquest mètode normalment és utilitzat internament per JavaScript i no explícitament als scripts.</p>
+
+<h2 id="Examples" name="Examples">Exemples</h2>
+
+<h3 id="Example:_Using_valueOf" name="Example:_Using_valueOf">Exemple: Utilitzar <code>valueOf</code></h3>
+
+<pre class="brush: js">x = new Boolean();
+myVar = x.valueOf(); // assigna false a myVar
+</pre>
+
+<h2 id="Especificacions">Especificacions</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">Especificació</th>
+   <th scope="col">Estat</th>
+   <th scope="col">Comentaris</th>
+  </tr>
+  <tr>
+   <td>ECMAScript 1a Edició.</td>
+   <td>Standard</td>
+   <td>Definició inicial. Implementat a JavaScript 1.1.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES5.1', '#sec-15.6.4.3', 'Boolean.prototype.valueOf')}}</td>
+   <td>{{Spec2('ES5.1')}}</td>
+   <td> </td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES6', '#sec-boolean.prototype.valueof', 'Boolean.prototype.valueOf')}}</td>
+   <td>{{Spec2('ES6')}}</td>
+   <td> </td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Compatibilitat_amb_navegadors">Compatibilitat amb navegadors</h2>
+
+<div>{{CompatibilityTable}}</div>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Característica</th>
+   <th>Chrome</th>
+   <th>Firefox (Gecko)</th>
+   <th>Internet Explorer</th>
+   <th>Opera</th>
+   <th>Safari</th>
+  </tr>
+  <tr>
+   <td>Suport bàsic</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>Característica</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>Suport bàsic</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="See_also" name="See_also">Vegeu també</h2>
+
+<ul>
+ <li>{{jsxref("Object.prototype.valueOf()")}}</li>
+</ul>