---
title: Object
slug: Web/JavaScript/Referencia/Objetos_globales/Object
tags:
  - Constructor
  - JavaScript
  - Objeto
  - Referencia
translation_of: Web/JavaScript/Reference/Global_Objects/Object
---
<div>{{JSRef}}</div>

<div>La clase Object representa uno de los tipos de datos de Javascript. Es es usado para guardar una colección de datos definidos y entidades más complejas. Los objetos pueden ser creados utilzando el constructor {{jsxref("Object/Object", "Object()")}} o la sintaxis literal de objeto. </div>

<p>El constructor <code><strong>Object</strong></code> crea una envoltura al objeto.</p>

<h2 id="Sintaxis">Sintaxis</h2>



<pre class="syntaxbox notranslate">// Object initialiser or literal
{ [ <var>nameValuePair1</var>[, <var>nameValuePair2</var>[, ...<var>nameValuePairN</var>] ] ] }

// Called as a constructor
new Object([<var>value</var>])</pre>

<h3 id="Parámetros">Parámetros</h3>

<dl>
 <dt><code>nameValuePair1, nameValuePair2, ... nameValuePair<em>N</em></code></dt>
 <dd>Los pares de nombres (strings) y los valores (cualquier valor) donde los nombres son separados por una coma.</dd>
 <dt><code>valor</code></dt>
 <dd>Cualquier valor.</dd>
</dl>

<h2 id="Description">Description</h2>

<p>El constructor <code>Object</code> crea una envoltura de objeto  al valor dado.  Si el valor es  {{jsxref("null")}} o {{jsxref("undefined")}}, creará y retornará un objeto vacío, de otra forma, retornará un objeto de un tipo que corresponda al valor dado. Si el valor ya es un objeto devolverá el valor.</p>

<p>Cuando es llamano en un contexto non-constructor, <code>Object </code>se comportará indenticamente a <code>new Object()</code>.</p>

<p>Ver <a href="/en-US/docs/Web/JavaScript/Reference/Operators/Object_initializer">object initializer / literal syntax</a>.</p>

<h2 id="Propiedades_del_constructor_Object">Propiedades del constructor <code>Object</code></h2>

<dl>
 <dt><code>Object.length</code></dt>
 <dd>Tiene un valor de 1.</dd>
 <dt>{{jsxref("Object.prototype")}}</dt>
 <dd>Permite añadir propiedades a todos los objetos del tipo Object.</dd>
</dl>

<h2 id="Métodos_del_constructor_Object">Métodos del constructor  <code>Object</code></h2>

<dl>
 <dt>{{jsxref("Object.assign()")}}</dt>
 <dd>Copia los valores de todas sus propiedades enumerables desde uno o más objetos fuente a un objeto destino.</dd>
 <dt>{{jsxref("Object.create()")}}</dt>
 <dd>Crea un nuevo objeto con el prototipo objeto y propiedades específicadas.</dd>
 <dt>{{jsxref("Object.defineProperty()")}}</dt>
 <dd>Añade la propiedad nombrada descrita por un descriptor dado a un objeto.</dd>
 <dt>{{jsxref("Object.defineProperties()")}}</dt>
 <dd>Agrega las propiedades nombradas descritas por los descriptores dados a un objeto.</dd>
 <dt>{{jsxref("Object.entries()")}}</dt>
 <dd>Returns an array containing all of the <code>[key, value]</code> pairs of a given object's <strong>own</strong> enumerable string properties.</dd>
 <dt>{{jsxref("Object.freeze()")}}</dt>
 <dd>Freezes an object: other code can't delete or change any properties.</dd>
 <dt>{{jsxref("Object.fromEntries()")}}</dt>
 <dd>Returns a new object from an iterable of key-value pairs (reverses {{jsxref("Object.entries")}}).</dd>
 <dt>{{jsxref("Object.getOwnPropertyDescriptor()")}}</dt>
 <dd>Returns a property descriptor for a named property on an object.</dd>
 <dt>{{jsxref("Object.getOwnPropertyDescriptors()")}}</dt>
 <dd>Returns an object containing all own property descriptors for an object.</dd>
 <dt>{{jsxref("Object.getOwnPropertyNames()")}}</dt>
 <dd>Returns an array containing the names of all of the given object's <strong>own</strong> enumerable and non-enumerable properties.</dd>
 <dt>{{jsxref("Object.getOwnPropertySymbols()")}}</dt>
 <dd>Returns an array of all symbol properties found directly upon a given object.</dd>
 <dt>{{jsxref("Object.getPrototypeOf()")}}</dt>
 <dd>Returns the prototype of the specified object.</dd>
 <dt>{{jsxref("Object.is()")}}</dt>
 <dd>Compares if two values are the same value. Equates all NaN values (which differs from both Abstract Equality Comparison and Strict Equality Comparison).</dd>
 <dt>{{jsxref("Object.isExtensible()")}}</dt>
 <dd>Determines if extending of an object is allowed.</dd>
 <dt>{{jsxref("Object.isFrozen()")}}</dt>
 <dd>Determines if an object was frozen.</dd>
 <dt>{{jsxref("Object.isSealed()")}}</dt>
 <dd>Determines if an object is sealed.</dd>
 <dt>{{jsxref("Object.keys()")}}</dt>
 <dd>Returns an array containing the names of all of the given object's <strong>own</strong> enumerable string properties.</dd>
 <dt>{{jsxref("Object.preventExtensions()")}}</dt>
 <dd>Prevents any extensions of an object.</dd>
 <dt>{{jsxref("Object.seal()")}}</dt>
 <dd>Prevents other code from deleting properties of an object.</dd>
 <dt>{{jsxref("Object.setPrototypeOf()")}}</dt>
 <dd>Sets the prototype (i.e., the internal <code>[[Prototype]]</code> property).</dd>
 <dt>{{jsxref("Object.values()")}}</dt>
 <dd>Returns an array containing the values that correspond to all of a given object's <strong>own</strong> enumerable string properties.</dd>
</dl>

<h2 id="Object_instances_and_Object_prototype_object"><code>Object</code> instances and <code>Object</code> prototype object</h2>

<p>All objects in JavaScript are descended from <code>Object</code>; all objects inherit methods and properties from {{jsxref("Object.prototype")}}, although they may be overridden. For example, other constructors' prototypes override the <code>constructor</code> property and provide their own <code>toString()</code> methods. Changes to the <code>Object</code> prototype object are propagated to all objects unless the properties and methods subject to those changes are overridden further along the prototype chain.</p>

<h3 id="Properties">Properties</h3>

<div>{{page('/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/prototype', 'Properties') }}</div>

<h3 id="Methods">Methods</h3>

<div>{{page('/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/prototype', 'Methods') }}</div>

<h2 id="Deleting_a_property_from_an_object">Deleting a property from an object</h2>

<p>There isn't any method in an Object itself to delete its own properties (e.g. like <code><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/delete">Map.prototype.delete()</a></code>). To do so one has to use the <a href="/en-US/docs/Web/JavaScript/Reference/Operators/delete">delete operator</a>.</p>

<h2 id="Examples">Examples</h2>

<h3 id="Using_Object_given_undefined_and_null_types">Using <code>Object</code> given <code>undefined</code> and <code>null</code> types</h3>

<p>The following examples store an empty <code>Object</code> object in <code>o</code>:</p>

<pre class="brush: js notranslate">var o = new Object();
</pre>

<pre class="brush: js notranslate">var o = new Object(undefined);
</pre>

<pre class="brush: js notranslate">var o = new Object(null);
</pre>

<h3 id="Using_Object_to_create_Boolean_objects">Using <code>Object</code> to create <code>Boolean</code> objects</h3>

<p>The following examples store {{jsxref("Boolean")}} objects in <code>o</code>:</p>

<pre class="brush: js notranslate">// equivalent to o = new Boolean(true);
var o = new Object(true);
</pre>

<pre class="brush: js notranslate">// equivalent to o = new Boolean(false);
var o = new Object(Boolean());
</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>Initial definition. Implemented in JavaScript 1.0.</td>
  </tr>
  <tr>
   <td>{{SpecName('ES5.1', '#sec-15.2', 'Object')}}</td>
   <td>{{Spec2('ES5.1')}}</td>
   <td></td>
  </tr>
  <tr>
   <td>{{SpecName('ES6', '#sec-object-objects', 'Object')}}</td>
   <td>{{Spec2('ES6')}}</td>
   <td>Added Object.assign, Object.getOwnPropertySymbols, Object.setPrototypeOf, Object.is</td>
  </tr>
  <tr>
   <td>{{SpecName('ESDraft', '#sec-object-objects', 'Object')}}</td>
   <td>{{Spec2('ESDraft')}}</td>
   <td>Added Object.entries, Object.values and Object.getOwnPropertyDescriptors.</td>
  </tr>
 </tbody>
</table>

<h2 id="Browser_compatibility">Browser compatibility</h2>

<div>


<p>{{Compat("javascript.builtins.Object")}}</p>
</div>

<h2 id="See_also">See also</h2>

<ul>
 <li><a href="/en-US/docs/Web/JavaScript/Reference/Operators/Object_initializer">Object initializer</a></li>
</ul>