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+---
+title: Number.prototype.valueOf()
+slug: Web/JavaScript/Reference/Global_Objects/Number/valueOf
+translation_of: Web/JavaScript/Reference/Global_Objects/Number/valueOf
+---
+<div>{{JSRef}}</div>
+
+<p>O método <strong><code>valueOf()</code></strong> retorna o valor primitivo contido no objeto {{jsxref("Number")}}.</p>
+
+<div>{{EmbedInteractiveExample("pages/js/number-valueof.html")}}</div>
+
+
+
+<h2 id="Sintaxe">Sintaxe</h2>
+
+<pre class="syntaxbox"><var>numObj</var>.valueOf()</pre>
+
+<h3 id="Valor_retornado">Valor retornado</h3>
+
+<p>Um número representando o valor primitivo do objeto {{jsxref("Number")}}.</p>
+
+<h2 id="Descrição">Descrição</h2>
+
+<p>Este método normalmente é invocado internamente pelo JavaScript e não explicitamente em um código web.</p>
+
+<h2 id="Exemplos">Exemplos</h2>
+
+<h3 id="Utilizando_valueOf">Utilizando <code>valueOf</code></h3>
+
+<pre class="brush: js">var numObj = new Number(10);
+console.log(typeof numObj); // object
+
+var num = numObj.valueOf();
+console.log(num);           // 10
+console.log(typeof num);    // number
+</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>Definição inicial. Implementada no JavaScript 1.1.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES5.1', '#sec-15.7.4.4', 'Number.prototype.valueOf')}}</td>
+   <td>{{Spec2('ES5.1')}}</td>
+   <td> </td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES6', '#sec-number.prototype.valueof', 'Number.prototype.valueOf')}}</td>
+   <td>{{Spec2('ES6')}}</td>
+   <td> </td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-number.prototype.valueof', 'Number.prototype.valueOf')}}</td>
+   <td>{{Spec2('ESDraft')}}</td>
+   <td> </td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility">Browser compatibility</h2>
+
+<p class="hidden">The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out <a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> and send us a pull request.</p>
+
+<p>{{Compat("javascript.builtins.Number.valueOf")}}</p>
+
+<h2 id="See_also">See also</h2>
+
+<ul>
+ <li>{{jsxref("Number.prototype.toSource()")}}</li>
+</ul>