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---
title: Map.prototype.keys()
slug: Web/JavaScript/Reference/Global_Objects/Map/keys
translation_of: Web/JavaScript/Reference/Global_Objects/Map/keys
original_slug: Web/JavaScript/Referencia/Objetos_globales/Map/keys
---
<div>{{JSRef}}</div>
<p>El metodo <code><strong>keys()</strong></code> returna un nuevo objeto <code><strong>Iterator</strong></code> que contiene las llaves/keys por cada elemento en el objeto en orden de insercion.</p>
<h2 id="Syntax">Syntax</h2>
<pre class="syntaxbox"><code><em>myMap</em>.keys()</code></pre>
<h2 id="Ejemplos">Ejemplos</h2>
<h3 id="Usando_keys()">Usando <code>keys()</code></h3>
<pre class="brush:js">var myMap = new Map();
myMap.set("0", "foo");
myMap.set(1, "bar");
myMap.set({}, "baz");
var mapIter = myMap.keys();
console.log(mapIter.next().value); // "0"
console.log(mapIter.next().value); // 1
console.log(mapIter.next().value); // Object
</pre>
<h2 id="Especificaciones">Especificaciones</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('ES6', '#sec-map.prototype.keys', 'Map.prototype.keys')}}</td>
<td>{{Spec2('ES6')}}</td>
<td>Initial definition.</td>
</tr>
<tr>
<td>{{SpecName('ESDraft', '#sec-map.prototype.keys', 'Map.prototype.keys')}}</td>
<td>{{Spec2('ESDraft')}}</td>
<td> </td>
</tr>
</tbody>
</table>
<h2 id="Browser_compatibility">Browser compatibility</h2>
<p>{{CompatibilityTable}}</p>
<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>38</td>
<td>{{CompatGeckoDesktop("20")}}</td>
<td>{{CompatNo}}</td>
<td>25</td>
<td>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>Basic support</td>
<td>{{CompatNo}}</td>
<td>38</td>
<td>{{CompatGeckoMobile("20") }}</td>
<td>{{CompatNo}}</td>
<td>{{CompatNo}}</td>
<td>8</td>
</tr>
</tbody>
</table>
</div>
<h2 id="See_also">See also</h2>
<ul>
<li>{{jsxref("Map.prototype.entries()")}}</li>
<li>{{jsxref("Map.prototype.values()")}}</li>
</ul>
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