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+---
+title: Array.prototype.keys()
+slug: Web/JavaScript/Reference/Global_Objects/Array/keys
+tags:
+  - Iteração
+  - metodo
+translation_of: Web/JavaScript/Reference/Global_Objects/Array/keys
+---
+<div>{{JSRef("Global_Objects", "Array")}}</div>
+
+<h2 id="Summary" name="Summary">Sumário</h2>
+
+<p>O método <code><strong>keys()</strong></code> retorna um novo <code><strong>Array Iterator</strong></code> que contém as chaves para cada <em>index</em> do array.</p>
+
+<h2 id="Syntax" name="Syntax">Sintaxe</h2>
+
+<pre class="syntaxbox"><code><var>arr</var>.keys()</code></pre>
+
+<h2 id="Examples" name="Examples">Exemplos</h2>
+
+<h3 id="Exemplo_uso_básico">Exemplo: uso básico</h3>
+
+<pre class="brush: js">var arr = ["a", "b", "c"];
+var iterator = arr.keys();
+
+console.log(iterator.next()); // { value: 0, done: false }
+console.log(iterator.next()); // { value: 1, done: false }
+console.log(iterator.next()); // { value: 2, done: false }
+console.log(iterator.next()); // { value: undefined, done: true }
+</pre>
+
+<h3 id="Exemplo_keys_iterator_não_ignora_lacunas">Exemplo: keys iterator não ignora lacunas</h3>
+
+<pre class="brush: js">var arr = ["a", , "c"];
+var sparseKeys = Object.keys(arr);
+var denseKeys = [...arr.keys()];
+console.log(sparseKeys); // [0, 2]
+console.log(denseKeys);  // [0, 1, 2]
+</pre>
+
+<h2 id="Specifications" name="Specifications">Especificações</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">Especificação</th>
+   <th scope="col">Status</th>
+   <th scope="col">Comentário</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES6', '#sec-array.prototype.keys', 'Array.prototype.keys')}}</td>
+   <td>{{Spec2('ES6')}}</td>
+   <td>Definição inicial.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility" name="Browser_compatibility">Compatibilidade de Browser</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>Suporte Básico</td>
+   <td>{{CompatChrome("38")}}</td>
+   <td>{{CompatGeckoDesktop("28")}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatOpera("25")}}</td>
+   <td>{{CompatSafari("7.1")}}</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>Suporte Básico</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatGeckoMobile("28")}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>iOS 8</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="See_also" name="See_also">Veja também</h2>
+
+<ul>
+ <li>{{jsxref("Array.prototype.values()")}}</li>
+ <li>{{jsxref("Array.prototype.entries()")}}</li>
+</ul>