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----
-title: Object.getOwnPropertyNames()
-slug: Web/JavaScript/Reference/Global_Objects/Object/getOwnPropertyNames
-translation_of: Web/JavaScript/Reference/Global_Objects/Object/getOwnPropertyNames
----
-<div>{{JSRef}}</div>
-
-<p>The <strong><code>Object.getOwnPropertyNames()</code></strong> phuong thuc nay tra ve mang (including non-enumerable properties except for those which use Symbol) found directly in a given object.</p>
-
-<div>{{EmbedInteractiveExample("pages/js/object-getownpropertynames.html")}}</div>
-
-<h2 id="Syntax">Syntax</h2>
-
-<pre class="brush: js">Object.getOwnPropertyNames(<var>obj</var>)</pre>
-
-<h3 id="Parameters">Parameters</h3>
-
-<dl>
- <dt><code><var>obj</var></code></dt>
- <dd>The object whose enumerable and non-enumerable properties are to be returned.</dd>
-</dl>
-
-<h3 id="Return_value">Return value</h3>
-
-<p>An array of strings that corresponds to the properties found directly in the given object.</p>
-
-<h2 id="Description">Description</h2>
-
-<p><code>Object.getOwnPropertyNames()</code> returns an array whose elements are strings corresponding to the enumerable and non-enumerable properties found directly in a given object <code><var>obj</var></code>. The ordering of the enumerable properties in the array is consistent with the ordering exposed by a {{jsxref("Statements/for...in", "for...in")}} loop (or by {{jsxref("Object.keys()")}}) over the properties of the object. The ordering of the non-enumerable properties in the array and the ordering among the enumerable properties is not defined.</p>
-
-<h2 id="Examples">Examples</h2>
-
-<h3 id="Using_Object.getOwnPropertyNames">Using <code>Object.getOwnPropertyNames()</code></h3>
-
-<pre class="brush: js">var arr = ['a', 'b', 'c'];
-console.log(Object.getOwnPropertyNames(arr).sort());
-// logs ["0", "1", "2", "length"]
-
-// Array-like object
-var obj = { 0: 'a', 1: 'b', 2: 'c' };
-console.log(Object.getOwnPropertyNames(obj).sort());
-// logs ["0", "1", "2"]
-
-// Logging property names and values using Array.forEach
-Object.getOwnPropertyNames(obj).forEach(
-  function (val, idx, array) {
-    console.log(val + ' -&gt; ' + obj[val]);
-  }
-);
-// logs
-// 0 -&gt; a
-// 1 -&gt; b
-// 2 -&gt; c
-
-// non-enumerable property
-var my_obj = Object.create({}, {
-  getFoo: {
-    value: function() { return this.foo; },
-    enumerable: false
-  }
-});
-my_obj.foo = 1;
-
-console.log(Object.getOwnPropertyNames(my_obj).sort());
-// logs ["foo", "getFoo"]
-</pre>
-
-<p>If you want only the enumerable properties, see {{jsxref("Object.keys()")}} or use a {{jsxref("Statements/for...in", "for...in")}} loop (note that this will also return enumerable properties found along the prototype chain for the object unless the latter is filtered with {{jsxref("Object.prototype.hasOwnProperty()", "hasOwnProperty()")}}).</p>
-
-<p>Items on the prototype chain are not listed:</p>
-
-<pre class="brush: js">function ParentClass() {}
-ParentClass.prototype.inheritedMethod = function() {};
-
-function ChildClass() {
-  this.prop = 5;
-  this.method = function() {};
-}
-ChildClass.prototype = new ParentClass;
-ChildClass.prototype.prototypeMethod = function() {};
-
-console.log(
-  Object.getOwnPropertyNames(
-    new ChildClass() // ["prop", "method"]
-  )
-);
-</pre>
-
-<h3 id="Get_non-enumerable_properties_only">Get non-enumerable properties only</h3>
-
-<p>This uses the {{jsxref("Array.prototype.filter()")}} function to remove the enumerable keys (obtained with {{jsxref("Object.keys()")}}) from a list of all keys (obtained with <code>Object.getOwnPropertyNames()</code>) thus giving only the non-enumerable keys as output.</p>
-
-<pre class="brush: js">var target = myObject;
-var enum_and_nonenum = Object.getOwnPropertyNames(target);
-var enum_only = Object.keys(target);
-var nonenum_only = enum_and_nonenum.filter(function(key) {
-  var indexInEnum = enum_only.indexOf(key);
-  if (indexInEnum == -1) {
-    // Not found in enum_only keys,
-    // meaning that the key is non-enumerable,
-    // so return true so we keep this in the filter
-    return true;
-  } else {
-    return false;
-  }
-});
-
-console.log(nonenum_only);
-</pre>
-
-<h2 id="Notes">Notes</h2>
-
-<p>In ES5, if the argument to this method is not an object (a primitive), then it will cause a {{jsxref("TypeError")}}. In ES2015, a non-object argument will be coerced to an object.</p>
-
-<pre class="brush: js">Object.getOwnPropertyNames('foo');
-// TypeError: "foo" is not an object (ES5 code)
-
-Object.getOwnPropertyNames('foo');
-// ["0", "1", "2", "length"]  (ES2015 code)
-</pre>
-
-<h2 id="Specifications">Specifications</h2>
-
-<table class="standard-table">
- <thead>
-  <tr>
-   <th scope="col">Specification</th>
-  </tr>
- </thead>
- <tbody>
-  <tr>
-   <td>{{SpecName('ESDraft', '#sec-object.getownpropertynames', 'Object.getOwnPropertyNames')}}</td>
-  </tr>
- </tbody>
-</table>
-
-<h2 id="Browser_compatibility">Browser compatibility</h2>
-
-
-
-<p>{{Compat("javascript.builtins.Object.getOwnPropertyNames")}}</p>
-
-<h2 id="Firefox-specific_notes">Firefox-specific notes</h2>
-
-<p>Prior to Firefox 28, <code>Object.getOwnPropertyNames</code> did not see unresolved properties of {{jsxref("Error")}} objects. This has been fixed in later versions (<a href="https://bugzilla.mozilla.org/show_bug.cgi?id=724768">bug 724768</a>).</p>
-
-<h2 id="See_also">See also</h2>
-
-<ul>
- <li><a href="/en-US/docs/Enumerability_and_ownership_of_properties">Enumerability and ownership of properties</a></li>
- <li>{{jsxref("Object.prototype.hasOwnProperty()")}}</li>
- <li>{{jsxref("Object.prototype.propertyIsEnumerable()")}}</li>
- <li>{{jsxref("Object.create()")}}</li>
- <li>{{jsxref("Object.keys()")}}</li>
- <li>{{jsxref("Array.forEach()")}}</li>
-</ul>