CINXE.COM

<!doctype html><html lang="en-US" prefix="og: https://ogp.me/ns#"><head><meta charSet="utf-8"/><meta name="viewport" content="width=device-width,initial-scale=1"/><link rel="icon" href="https://developer.mozilla.org/favicon-48x48.bc390275e955dacb2e65.png"/><link rel="apple-touch-icon" href="https://developer.mozilla.org/apple-touch-icon.528534bba673c38049c2.png"/><meta name="theme-color" content="#ffffff"/><link rel="manifest" href="https://developer.mozilla.org/manifest.f42880861b394dd4dc9b.json"/><link rel="search" type="application/opensearchdescription+xml" href="/opensearch.xml" title="MDN Web Docs"/><title>Object.prototype.propertyIsEnumerable() - JavaScript | MDN</title><link rel="alternate" title="Object.prototype.propertyIsEnumerable()" href="https://developer.mozilla.org/de/docs/Web/JavaScript/Reference/Global_Objects/Object/propertyIsEnumerable" hrefLang="de"/><link rel="alternate" title="Object.prototype.propertyIsEnumerable()" href="https://developer.mozilla.org/es/docs/Web/JavaScript/Reference/Global_Objects/Object/propertyIsEnumerable" hrefLang="es"/><link rel="alternate" title="Object.prototype.propertyIsEnumerable()" href="https://developer.mozilla.org/fr/docs/Web/JavaScript/Reference/Global_Objects/Object/propertyIsEnumerable" hrefLang="fr"/><link rel="alternate" title="Object.prototype.propertyIsEnumerable()" href="https://developer.mozilla.org/ja/docs/Web/JavaScript/Reference/Global_Objects/Object/propertyIsEnumerable" hrefLang="ja"/><link rel="alternate" title="Object.prototype.propertyIsEnumerable()" href="https://developer.mozilla.org/ko/docs/Web/JavaScript/Reference/Global_Objects/Object/propertyIsEnumerable" hrefLang="ko"/><link rel="alternate" title="Object.prototype.propertyIsEnumerable()" href="https://developer.mozilla.org/pt-BR/docs/Web/JavaScript/Reference/Global_Objects/Object/propertyIsEnumerable" hrefLang="pt"/><link rel="alternate" title="Object.prototype.propertyIsEnumerable()" href="https://developer.mozilla.org/ru/docs/Web/JavaScript/Reference/Global_Objects/Object/propertyIsEnumerable" hrefLang="ru"/><link rel="alternate" title="Object.prototype.propertyIsEnumerable()" href="https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Object/propertyIsEnumerable" hrefLang="zh"/><link rel="alternate" title="Object.prototype.propertyIsEnumerable()" href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/propertyIsEnumerable" hrefLang="en"/><link rel="preload" as="font" type="font/woff2" href="/static/media/Inter.var.c2fe3cb2b7c746f7966a.woff2" crossorigin=""/><link rel="alternate" type="application/rss+xml" title="MDN Blog RSS Feed" href="https://developer.mozilla.org/en-US/blog/rss.xml" hrefLang="en"/><meta name="description" content="The propertyIsEnumerable() method of Object instances returns a boolean indicating whether the specified property is this object's enumerable own property."/><meta property="og:url" content="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/propertyIsEnumerable"/><meta property="og:title" content="Object.prototype.propertyIsEnumerable() - JavaScript | MDN"/><meta property="og:type" content="website"/><meta property="og:locale" content="en_US"/><meta property="og:description" content="The propertyIsEnumerable() method of Object instances returns a boolean indicating whether the specified property is this object's enumerable own property."/><meta property="og:image" content="https://developer.mozilla.org/mdn-social-share.d893525a4fb5fb1f67a2.png"/><meta property="og:image:type" content="image/png"/><meta property="og:image:height" content="1080"/><meta property="og:image:width" content="1920"/><meta property="og:image:alt" content="The MDN Web Docs logo, featuring a blue accent color, displayed on a solid black background."/><meta property="og:site_name" content="MDN Web Docs"/><meta name="twitter:card" content="summary_large_image"/><meta name="twitter:creator" content="MozDevNet"/><link rel="canonical" href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/propertyIsEnumerable"/><style media="print">.article-actions-container,.document-toc-container,.language-menu,.main-menu-toggle,.on-github,.page-footer,.place,.sidebar,.top-banner,.top-navigation-main,ul.prev-next{display:none!important}.main-page-content,.main-page-content pre{padding:2px}.main-page-content pre{border-left-width:2px}</style><script src="/static/js/gtag.js" defer=""></script><script defer="" src="/static/js/main.9722bf44.js"></script><link href="/static/css/main.27d5b2a8.css" rel="stylesheet"/></head><body><script>if(document.body.addEventListener("load",(t=>{t.target.classList.contains("interactive")&&t.target.setAttribute("data-readystate","complete")}),{capture:!0}),window&&document.documentElement){const t={light:"#ffffff",dark:"#1b1b1b"};try{const e=window.localStorage.getItem("theme");e&&(document.documentElement.className=e,document.documentElement.style.backgroundColor=t[e]);const o=window.localStorage.getItem("nop");o&&(document.documentElement.dataset.nop=o)}catch(t){console.warn("Unable to read theme from localStorage",t)}}</script><div id="root"><ul id="nav-access" class="a11y-nav"><li><a id="skip-main" href="#content">Skip to main content</a></li><li><a id="skip-search" href="#top-nav-search-input">Skip to search</a></li><li><a id="skip-select-language" href="#languages-switcher-button">Skip to select language</a></li></ul><div class="page-wrapper category-javascript document-page"><div class="top-banner loading"><section class="place top container"></section></div><div class="sticky-header-container"><header class="top-navigation "><div class="container "><div class="top-navigation-wrap"><a href="/en-US/" class="logo" aria-label="MDN homepage"><svg id="mdn-docs-logo" xmlns="http://www.w3.org/2000/svg" x="0" y="0" viewBox="0 0 694.9 104.4" style="enable-background:new 0 0 694.9 104.4" xml:space="preserve" role="img"><title>MDN Web Docs</title><path d="M40.3 0 11.7 92.1H0L28.5 0h11.8zm10.4 0v92.1H40.3V0h10.4zM91 0 62.5 92.1H50.8L79.3 0H91zm10.4 0v92.1H91V0h10.4z" class="logo-m"></path><path d="M627.9 95.6h67v8.8h-67v-8.8z" class="logo-_"></path><path d="M367 42h-4l-10.7 30.8h-5.5l-10.8-26h-.4l-10.5 26h-5.2L308.7 42h-3.8v-5.6H323V42h-6.5l6.8 20.4h.4l10.3-26h4.7l11.2 26h.5l5.7-20.3h-6.2v-5.6H367V42zm34.9 20c-.4 3.2-2 5.9-4.7 8.2-2.8 2.3-6.5 3.4-11.3 3.4-5.4 0-9.7-1.6-13.1-4.7-3.3-3.2-5-7.7-5-13.7 0-5.7 1.6-10.3 4.7-14s7.4-5.5 12.9-5.5c5.1 0 9.1 1.6 11.9 4.7s4.3 6.9 4.3 11.3c0 1.5-.2 3-.5 4.7h-25.6c.3 7.7 4 11.6 10.9 11.6 2.9 0 5.1-.7 6.5-2 1.5-1.4 2.5-3 3-4.9l6 .9zM394 51.3c.2-2.4-.4-4.7-1.8-6.9s-3.8-3.3-7-3.3c-3.1 0-5.3 1-6.9 3-1.5 2-2.5 4.4-2.8 7.2H394zm51 2.4c0 5-1.3 9.5-4 13.7s-6.9 6.2-12.7 6.2c-6 0-10.3-2.2-12.7-6.7-.1.4-.2 1.4-.4 2.9s-.3 2.5-.4 2.9h-7.3c.3-1.7.6-3.5.8-5.3.3-1.8.4-3.7.4-5.5V22.3h-6v-5.6H416v27c1.1-2.2 2.7-4.1 4.7-5.7 2-1.6 4.8-2.4 8.4-2.4 4.6 0 8.4 1.6 11.4 4.7 3 3.2 4.5 7.6 4.5 13.4zm-7.7.6c0-4.2-1-7.4-3-9.5-2-2.2-4.4-3.3-7.4-3.3-3.4 0-6 1.2-8 3.7-1.9 2.4-2.9 5-3 7.7V57c0 3 1 5.6 3 7.7s4.5 3.1 7.6 3.1c3.6 0 6.3-1.3 8.1-3.9 1.8-2.7 2.7-5.9 2.7-9.6zm69.2 18.5h-13.2v-7.2c-1.2 2.2-2.8 4.1-4.9 5.6-2.1 1.6-4.8 2.4-8.3 2.4-4.8 0-8.7-1.6-11.6-4.9-2.9-3.2-4.3-7.7-4.3-13.3 0-5 1.3-9.6 4-13.7 2.6-4.1 6.9-6.2 12.8-6.2 5.7 0 9.8 2.2 12.3 6.5V22.3h-8.6v-5.6h15.8v50.6h6v5.5zM493.2 56v-4.4c-.1-3-1.2-5.5-3.2-7.3s-4.4-2.8-7.2-2.8c-3.6 0-6.3 1.3-8.2 3.9-1.9 2.6-2.8 5.8-2.8 9.6 0 4.1 1 7.3 3 9.5s4.5 3.3 7.4 3.3c3.2 0 5.8-1.3 7.8-3.8 2.1-2.6 3.1-5.3 3.2-8zm53.1-1.4c0 5.6-1.8 10.2-5.3 13.7s-8.2 5.3-13.9 5.3-10.1-1.7-13.4-5.1c-3.3-3.4-5-7.9-5-13.5 0-5.3 1.6-9.9 4.7-13.7 3.2-3.8 7.9-5.7 14.2-5.7s11 1.9 14.1 5.7c3 3.7 4.6 8.1 4.6 13.3zm-7.7-.2c0-4-1-7.2-3-9.5s-4.8-3.5-8.2-3.5c-3.6 0-6.4 1.2-8.3 3.7s-2.9 5.6-2.9 9.5c0 3.7.9 6.8 2.8 9.4 1.9 2.6 4.6 3.9 8.3 3.9 3.6 0 6.4-1.3 8.4-3.8 1.9-2.6 2.9-5.8 2.9-9.7zm45 5.8c-.4 3.2-1.9 6.3-4.4 9.1-2.5 2.9-6.4 4.3-11.8 4.3-5.2 0-9.4-1.6-12.6-4.8-3.2-3.2-4.8-7.7-4.8-13.7 0-5.5 1.6-10.1 4.7-13.9 3.2-3.8 7.6-5.7 13.2-5.7 2.3 0 4.6.3 6.7.8 2.2.5 4.2 1.5 6.2 2.9l1.5 9.5-5.9.7-1.3-6.1c-2.1-1.2-4.5-1.8-7.2-1.8-3.5 0-6.1 1.2-7.7 3.7-1.7 2.5-2.5 5.7-2.5 9.6 0 4.1.9 7.3 2.7 9.5 1.8 2.3 4.4 3.4 7.8 3.4 5.2 0 8.2-2.9 9.2-8.8l6.2 1.3zm34.7 1.9c0 3.6-1.5 6.5-4.6 8.5s-7 3-11.7 3c-5.7 0-10.6-1.2-14.6-3.6l1.2-8.8 5.7.6-.2 4.7c1.1.5 2.3.9 3.6 1.1s2.6.3 3.9.3c2.4 0 4.5-.4 6.5-1.3 1.9-.9 2.9-2.2 2.9-4.1 0-1.8-.8-3.1-2.3-3.8s-3.5-1.3-5.8-1.7-4.6-.9-6.9-1.4c-2.3-.6-4.2-1.6-5.7-2.9-1.6-1.4-2.3-3.5-2.3-6.3 0-4.1 1.5-6.9 4.6-8.5s6.4-2.4 9.9-2.4c2.6 0 5 .3 7.2.9 2.2.6 4.3 1.4 6.1 2.4l.8 8.8-5.8.7-.8-5.7c-2.3-1-4.7-1.6-7.2-1.6-2.1 0-3.7.4-5.1 1.1-1.3.8-2 2-2 3.8 0 1.7.8 2.9 2.3 3.6 1.5.7 3.4 1.2 5.7 1.6 2.2.4 4.5.8 6.7 1.4 2.2.6 4.1 1.6 5.7 3 1.4 1.6 2.2 3.7 2.2 6.6zM197.6 73.2h-17.1v-5.5h3.8V51.9c0-3.7-.7-6.3-2.1-7.9-1.4-1.6-3.3-2.3-5.7-2.3-3.2 0-5.6 1.1-7.2 3.4s-2.4 4.6-2.5 6.9v15.6h6v5.5h-17.1v-5.5h3.8V51.9c0-3.8-.7-6.4-2.1-7.9-1.4-1.5-3.3-2.3-5.6-2.3-3.2 0-5.5 1.1-7.2 3.3-1.6 2.2-2.4 4.5-2.5 6.9v15.8h6.9v5.5h-20.2v-5.5h6V42.4h-6.1v-5.6h13.4v6.4c1.2-2.1 2.7-3.8 4.7-5.2 2-1.3 4.4-2 7.3-2s5.3.7 7.5 2.1c2.2 1.4 3.7 3.5 4.5 6.4 1.1-2.5 2.7-4.5 4.9-6.1s4.8-2.4 7.9-2.4c3.5 0 6.5 1.1 8.9 3.3s3.7 5.6 3.7 10.2v18.2h6.1v5.5zm42.5 0h-13.2V66c-1.2 2.2-2.8 4.1-4.9 5.6-2.1 1.6-4.8 2.4-8.3 2.4-4.8 0-8.7-1.6-11.6-4.9-2.9-3.2-4.3-7.7-4.3-13.3 0-5 1.3-9.6 4-13.7 2.6-4.1 6.9-6.2 12.8-6.2s9.8 2.2 12.3 6.5V22.7h-8.6v-5.6h15.8v50.6h6v5.5zm-13.3-16.8V52c-.1-3-1.2-5.5-3.2-7.3s-4.4-2.8-7.2-2.8c-3.6 0-6.3 1.3-8.2 3.9-1.9 2.6-2.8 5.8-2.8 9.6 0 4.1 1 7.3 3 9.5s4.5 3.3 7.4 3.3c3.2 0 5.8-1.3 7.8-3.8 2.1-2.6 3.1-5.3 3.2-8zm61.5 16.8H269v-5.5h6V51.9c0-3.7-.7-6.3-2.2-7.9-1.4-1.6-3.4-2.3-5.7-2.3-3.1 0-5.6 1-7.4 3s-2.8 4.4-2.9 7v15.9h6v5.5h-19.3v-5.5h6V42.4h-6.2v-5.6h13.6V43c2.6-4.6 6.8-6.9 12.7-6.9 3.6 0 6.7 1.1 9.2 3.3s3.7 5.6 3.7 10.2v18.2h6v5.4h-.2z" class="logo-text"></path></svg></a><button title="Open main menu" type="button" class="button action has-icon main-menu-toggle" aria-haspopup="menu" aria-label="Open main menu" aria-expanded="false"><span class="button-wrap"><span class="icon icon-menu "></span><span class="visually-hidden">Open main menu</span></span></button></div><div class="top-navigation-main"><nav class="main-nav" aria-label="Main menu"><ul class="main-menu nojs"><li class="top-level-entry-container active"><button type="button" id="references-button" class="top-level-entry menu-toggle" aria-controls="references-menu" aria-expanded="false">References</button><a href="/en-US/docs/Web" class="top-level-entry">References</a><ul id="references-menu" class="submenu references hidden inline-submenu-lg" aria-labelledby="references-button"><li class="apis-link-container mobile-only "><a href="/en-US/docs/Web" class="submenu-item "><div class="submenu-icon"></div><div class="submenu-content-container"><div class="submenu-item-heading">Overview / Web Technology</div><p class="submenu-item-description">Web technology reference for developers</p></div></a></li><li class="html-link-container "><a href="/en-US/docs/Web/HTML" class="submenu-item "><div class="submenu-icon html"></div><div class="submenu-content-container"><div class="submenu-item-heading">HTML</div><p class="submenu-item-description">Structure of content on the web</p></div></a></li><li class="css-link-container "><a href="/en-US/docs/Web/CSS" class="submenu-item "><div class="submenu-icon css"></div><div class="submenu-content-container"><div class="submenu-item-heading">CSS</div><p class="submenu-item-description">Code used to describe document style</p></div></a></li><li class="javascript-link-container "><a href="/en-US/docs/Web/JavaScript" class="submenu-item "><div class="submenu-icon javascript"></div><div class="submenu-content-container"><div class="submenu-item-heading">JavaScript</div><p class="submenu-item-description">General-purpose scripting language</p></div></a></li><li class="http-link-container "><a href="/en-US/docs/Web/HTTP" class="submenu-item "><div class="submenu-icon http"></div><div class="submenu-content-container"><div class="submenu-item-heading">HTTP</div><p class="submenu-item-description">Protocol for transmitting web resources</p></div></a></li><li class="apis-link-container "><a href="/en-US/docs/Web/API" class="submenu-item "><div class="submenu-icon apis"></div><div class="submenu-content-container"><div class="submenu-item-heading">Web APIs</div><p class="submenu-item-description">Interfaces for building web applications</p></div></a></li><li class="apis-link-container "><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions" class="submenu-item "><div class="submenu-icon"></div><div class="submenu-content-container"><div class="submenu-item-heading">Web Extensions</div><p class="submenu-item-description">Developing extensions for web browsers</p></div></a></li><li class="apis-link-container desktop-only "><a href="/en-US/docs/Web" class="submenu-item "><div class="submenu-icon"></div><div class="submenu-content-container"><div class="submenu-item-heading">Web Technology</div><p class="submenu-item-description">Web technology reference for developers</p></div></a></li></ul></li><li class="top-level-entry-container "><button type="button" id="guides-button" class="top-level-entry menu-toggle" aria-controls="guides-menu" aria-expanded="false">Guides</button><a href="/en-US/docs/Learn" class="top-level-entry">Guides</a><ul id="guides-menu" class="submenu guides hidden inline-submenu-lg" aria-labelledby="guides-button"><li class="apis-link-container mobile-only "><a href="/en-US/docs/Learn" class="submenu-item "><div class="submenu-icon learn"></div><div class="submenu-content-container"><div class="submenu-item-heading">Overview / MDN Learning Area</div><p class="submenu-item-description">Learn web development</p></div></a></li><li class="apis-link-container desktop-only "><a href="/en-US/docs/Learn" class="submenu-item "><div class="submenu-icon learn"></div><div class="submenu-content-container"><div class="submenu-item-heading">MDN Learning Area</div><p class="submenu-item-description">Learn web development</p></div></a></li><li class="html-link-container "><a href="/en-US/docs/Learn/HTML" class="submenu-item "><div class="submenu-icon html"></div><div class="submenu-content-container"><div class="submenu-item-heading">HTML</div><p class="submenu-item-description">Learn to structure web content with HTML</p></div></a></li><li class="css-link-container "><a href="/en-US/docs/Learn/CSS" class="submenu-item "><div class="submenu-icon css"></div><div class="submenu-content-container"><div class="submenu-item-heading">CSS</div><p class="submenu-item-description">Learn to style content using CSS</p></div></a></li><li class="javascript-link-container "><a href="/en-US/docs/Learn/JavaScript" class="submenu-item "><div class="submenu-icon javascript"></div><div class="submenu-content-container"><div class="submenu-item-heading">JavaScript</div><p class="submenu-item-description">Learn to run scripts in the browser</p></div></a></li><li class=" "><a href="/en-US/docs/Web/Accessibility" class="submenu-item "><div class="submenu-icon"></div><div class="submenu-content-container"><div class="submenu-item-heading">Accessibility</div><p class="submenu-item-description">Learn to make the web accessible to all</p></div></a></li></ul></li><li class="top-level-entry-container "><button type="button" id="mdn-plus-button" class="top-level-entry menu-toggle" aria-controls="mdn-plus-menu" aria-expanded="false">Plus</button><a href="/en-US/plus" class="top-level-entry">Plus</a><ul id="mdn-plus-menu" class="submenu mdn-plus hidden inline-submenu-lg" aria-labelledby="mdn-plus-button"><li class=" "><a href="/en-US/plus" class="submenu-item "><div class="submenu-icon"></div><div class="submenu-content-container"><div class="submenu-item-heading">Overview</div><p class="submenu-item-description">A customized MDN experience</p></div></a></li><li class=" "><a href="/en-US/plus/ai-help" class="submenu-item "><div class="submenu-icon"></div><div class="submenu-content-container"><div class="submenu-item-heading">AI Help</div><p class="submenu-item-description">Get real-time assistance and support</p></div></a></li><li class=" "><a href="/en-US/plus/updates" class="submenu-item "><div class="submenu-icon"></div><div class="submenu-content-container"><div class="submenu-item-heading">Updates</div><p class="submenu-item-description">All browser compatibility updates at a glance</p></div></a></li><li class=" "><a href="/en-US/plus/docs/features/overview" class="submenu-item "><div class="submenu-icon"></div><div class="submenu-content-container"><div class="submenu-item-heading">Documentation</div><p class="submenu-item-description">Learn how to use MDN Plus</p></div></a></li><li class=" "><a href="/en-US/plus/docs/faq" class="submenu-item "><div class="submenu-icon"></div><div class="submenu-content-container"><div class="submenu-item-heading">FAQ</div><p class="submenu-item-description">Frequently asked questions about MDN Plus</p></div></a></li></ul></li><li class="top-level-entry-container "><a class="top-level-entry menu-link" href="/en-US/curriculum/">Curriculum <sup class="new">New</sup></a></li><li class="top-level-entry-container "><a class="top-level-entry menu-link" href="/en-US/blog/">Blog</a></li><li class="top-level-entry-container "><button type="button" id="tools-button" class="top-level-entry menu-toggle" aria-controls="tools-menu" aria-expanded="false">Tools</button><ul id="tools-menu" class="submenu tools hidden inline-submenu-lg" aria-labelledby="tools-button"><li class=" "><a href="/en-US/play" class="submenu-item "><div class="submenu-icon"></div><div class="submenu-content-container"><div class="submenu-item-heading">Playground</div><p class="submenu-item-description">Write, test and share your code</p></div></a></li><li class=" "><a href="/en-US/observatory" class="submenu-item "><div class="submenu-icon"></div><div class="submenu-content-container"><div class="submenu-item-heading">HTTP Observatory</div><p class="submenu-item-description">Scan a website for free</p></div></a></li><li class=" "><a href="/en-US/plus/ai-help" class="submenu-item "><div class="submenu-icon"></div><div class="submenu-content-container"><div class="submenu-item-heading">AI Help</div><p class="submenu-item-description">Get real-time assistance and support</p></div></a></li></ul></li></ul></nav><div class="header-search"><form action="/en-US/search" class="search-form search-widget" id="top-nav-search-form" role="search"><label id="top-nav-search-label" for="top-nav-search-input" class="visually-hidden">Search MDN</label><input aria-activedescendant="" aria-autocomplete="list" aria-controls="top-nav-search-menu" aria-expanded="false" aria-labelledby="top-nav-search-label" autoComplete="off" id="top-nav-search-input" role="combobox" type="search" class="search-input-field" name="q" placeholder=" " required="" value=""/><button type="button" class="button action has-icon clear-search-button"><span class="button-wrap"><span class="icon icon-cancel "></span><span class="visually-hidden">Clear search input</span></span></button><button type="submit" class="button action has-icon search-button"><span class="button-wrap"><span class="icon icon-search "></span><span class="visually-hidden">Search</span></span></button><div id="top-nav-search-menu" role="listbox" aria-labelledby="top-nav-search-label"></div></form></div><div class="theme-switcher-menu"><button type="button" class="button action has-icon theme-switcher-menu small" aria-haspopup="menu"><span class="button-wrap"><span class="icon icon-theme-os-default "></span>Theme</span></button></div><ul class="auth-container"><li><a href="/users/fxa/login/authenticate/?next=%2Fen-US%2Fdocs%2FWeb%2FJavaScript%2FReference%2FGlobal_Objects%2FObject%2FpropertyIsEnumerable" class="login-link" rel="nofollow">Log in</a></li><li><a href="/users/fxa/login/authenticate/?next=%2Fen-US%2Fdocs%2FWeb%2FJavaScript%2FReference%2FGlobal_Objects%2FObject%2FpropertyIsEnumerable" target="_self" rel="nofollow" class="button primary mdn-plus-subscribe-link"><span class="button-wrap">Sign up for free</span></a></li></ul></div></div></header><div class="article-actions-container"><div class="container"><button type="button" class="button action has-icon sidebar-button" aria-label="Expand sidebar" aria-expanded="false" aria-controls="sidebar-quicklinks"><span class="button-wrap"><span class="icon icon-sidebar "></span></span></button><nav class="breadcrumbs-container" aria-label="Breadcrumb"><ol typeof="BreadcrumbList" vocab="https://schema.org/" aria-label="breadcrumbs"><li property="itemListElement" typeof="ListItem"><a href="/en-US/docs/Web" class="breadcrumb" property="item" typeof="WebPage"><span property="name">References</span></a><meta property="position" content="1"/></li><li property="itemListElement" typeof="ListItem"><a href="/en-US/docs/Web/JavaScript" class="breadcrumb" property="item" typeof="WebPage"><span property="name">JavaScript</span></a><meta property="position" content="2"/></li><li property="itemListElement" typeof="ListItem"><a href="/en-US/docs/Web/JavaScript/Reference" class="breadcrumb" property="item" typeof="WebPage"><span property="name">Reference</span></a><meta property="position" content="3"/></li><li property="itemListElement" typeof="ListItem"><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects" class="breadcrumb" property="item" typeof="WebPage"><span property="name">Standard built-in objects</span></a><meta property="position" content="4"/></li><li property="itemListElement" typeof="ListItem"><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object" class="breadcrumb" property="item" typeof="WebPage"><span property="name">Object</span></a><meta property="position" content="5"/></li><li property="itemListElement" typeof="ListItem"><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/propertyIsEnumerable" class="breadcrumb-current-page" property="item" typeof="WebPage"><span property="name">Object.prototype.propertyIsEnumerable()</span></a><meta property="position" content="6"/></li></ol></nav><div class="article-actions"><button type="button" class="button action has-icon article-actions-toggle" aria-label="Article actions"><span class="button-wrap"><span class="icon icon-ellipses "></span><span class="article-actions-dialog-heading">Article Actions</span></span></button><ul class="article-actions-entries"><li class="article-actions-entry"><div class="languages-switcher-menu open-on-focus-within"><button id="languages-switcher-button" type="button" class="button action small has-icon languages-switcher-menu" aria-haspopup="menu"><span class="button-wrap"><span class="icon icon-language "></span>English (US)</span></button><div class="hidden"><ul class="submenu language-menu " aria-labelledby="language-menu-button"><li class=" "><form class="submenu-item locale-redirect-setting"><div class="group"><label class="switch"><input type="checkbox" name="locale-redirect"/><span class="slider"></span><span class="label">Remember language</span></label><a href="https://github.com/orgs/mdn/discussions/739" rel="external noopener noreferrer" target="_blank" title="Enable this setting to automatically switch to this language when it's available. (Click to learn more.)"><span class="icon icon-question-mark "></span></a></div></form></li><li class=" "><a data-locale="de" href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/propertyIsEnumerable" class="button submenu-item"><span>Deutsch</span><span title="Diese Übersetzung ist Teil eines Experiments."><span class="icon icon-experimental "></span></span></a></li><li class=" "><a data-locale="es" href="/es/docs/Web/JavaScript/Reference/Global_Objects/Object/propertyIsEnumerable" class="button submenu-item"><span>Español</span></a></li><li class=" "><a data-locale="fr" href="/fr/docs/Web/JavaScript/Reference/Global_Objects/Object/propertyIsEnumerable" class="button submenu-item"><span>Français</span></a></li><li class=" "><a data-locale="ja" href="/ja/docs/Web/JavaScript/Reference/Global_Objects/Object/propertyIsEnumerable" class="button submenu-item"><span>日本語</span></a></li><li class=" "><a data-locale="ko" href="/ko/docs/Web/JavaScript/Reference/Global_Objects/Object/propertyIsEnumerable" class="button submenu-item"><span>한국어</span></a></li><li class=" "><a data-locale="pt-BR" href="/pt-BR/docs/Web/JavaScript/Reference/Global_Objects/Object/propertyIsEnumerable" class="button submenu-item"><span>Português (do Brasil)</span></a></li><li class=" "><a data-locale="ru" href="/ru/docs/Web/JavaScript/Reference/Global_Objects/Object/propertyIsEnumerable" class="button submenu-item"><span>Русский</span></a></li><li class=" "><a data-locale="zh-CN" href="/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Object/propertyIsEnumerable" class="button submenu-item"><span>中文 (简体)</span></a></li></ul></div></div></li></ul></div></div></div></div><div class="main-wrapper"><div class="sidebar-container"><aside id="sidebar-quicklinks" class="sidebar" data-macro="JSRef"><button type="button" class="button action backdrop" aria-label="Collapse sidebar"><span class="button-wrap"></span></button><nav aria-label="Related Topics" class="sidebar-inner"><header class="sidebar-actions"><section class="sidebar-filter-container"><div class="sidebar-filter "><label id="sidebar-filter-label" class="sidebar-filter-label" for="sidebar-filter-input"><span class="icon icon-filter"></span><span class="visually-hidden">Filter sidebar</span></label><input id="sidebar-filter-input" autoComplete="off" class="sidebar-filter-input-field false" type="text" placeholder="Filter" value=""/><button type="button" class="button action has-icon clear-sidebar-filter-button"><span class="button-wrap"><span class="icon icon-cancel "></span><span class="visually-hidden">Clear filter input</span></span></button></div></section></header><div class="sidebar-inner-nav"><div class="in-nav-toc"><div class="document-toc-container"><section class="document-toc"><header><h2 class="document-toc-heading">In this article</h2></header><ul class="document-toc-list"><li class="document-toc-item "><a class="document-toc-link" href="#try_it">Try it</a></li><li class="document-toc-item "><a class="document-toc-link" href="#syntax">Syntax</a></li><li class="document-toc-item "><a class="document-toc-link" href="#description">Description</a></li><li class="document-toc-item "><a class="document-toc-link" href="#examples">Examples</a></li><li class="document-toc-item "><a class="document-toc-link" href="#specifications">Specifications</a></li><li class="document-toc-item "><a class="document-toc-link" href="#browser_compatibility">Browser compatibility</a></li><li class="document-toc-item "><a class="document-toc-link" href="#see_also">See also</a></li></ul></section></div></div><div class="sidebar-body"><ol><li class="section"><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects">Standard built-in objects</a></li><li class="section"><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object"><code>Object</code></a></li><li><details open=""><summary>Constructor</summary><ol><li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/Object"><code>Object() constructor</code></a></li></ol></details></li><li><details open=""><summary>Static methods</summary><ol><li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign"><code>Object.assign()</code></a></li><li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/create"><code>Object.create()</code></a></li><li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/defineProperties"><code>Object.defineProperties()</code></a></li><li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/defineProperty"><code>Object.defineProperty()</code></a></li><li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/entries"><code>Object.entries()</code></a></li><li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/freeze"><code>Object.freeze()</code></a></li><li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/fromEntries"><code>Object.fromEntries()</code></a></li><li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/getOwnPropertyDescriptor"><code>Object.getOwnPropertyDescriptor()</code></a></li><li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/getOwnPropertyDescriptors"><code>Object.getOwnPropertyDescriptors()</code></a></li><li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/getOwnPropertyNames"><code>Object.getOwnPropertyNames()</code></a></li><li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/getOwnPropertySymbols"><code>Object.getOwnPropertySymbols()</code></a></li><li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/getPrototypeOf"><code>Object.getPrototypeOf()</code></a></li><li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/groupBy"><code>Object.groupBy()</code></a></li><li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/hasOwn"><code>Object.hasOwn()</code></a></li><li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/is"><code>Object.is()</code></a></li><li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/isExtensible"><code>Object.isExtensible()</code></a></li><li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/isFrozen"><code>Object.isFrozen()</code></a></li><li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/isSealed"><code>Object.isSealed()</code></a></li><li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/keys"><code>Object.keys()</code></a></li><li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/preventExtensions"><code>Object.preventExtensions()</code></a></li><li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/seal"><code>Object.seal()</code></a></li><li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/setPrototypeOf"><code>Object.setPrototypeOf()</code></a></li><li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/values"><code>Object.values()</code></a></li></ol></details></li><li><details open=""><summary>Instance methods</summary><ol><li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/__defineGetter__"><code>Object.prototype.__defineGetter__()</code></a><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">Deprecated</span> </abbr></li><li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/__defineSetter__"><code>Object.prototype.__defineSetter__()</code></a><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">Deprecated</span> </abbr></li><li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/__lookupGetter__"><code>Object.prototype.__lookupGetter__()</code></a><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">Deprecated</span> </abbr></li><li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/__lookupSetter__"><code>Object.prototype.__lookupSetter__()</code></a><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">Deprecated</span> </abbr></li><li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/hasOwnProperty"><code>Object.prototype.hasOwnProperty()</code></a></li><li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/isPrototypeOf"><code>Object.prototype.isPrototypeOf()</code></a></li><li><em><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/propertyIsEnumerable" aria-current="page"><code>Object.prototype.propertyIsEnumerable()</code></a></em></li><li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/toLocaleString"><code>Object.prototype.toLocaleString()</code></a></li><li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/toString"><code>Object.prototype.toString()</code></a></li><li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/valueOf"><code>Object.prototype.valueOf()</code></a></li></ol></details></li><li><details open=""><summary>Instance properties</summary><ol><li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/constructor"><code>Object.prototype.constructor</code></a></li><li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/proto"><code>Object.prototype.__proto__</code></a><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">Deprecated</span> </abbr></li></ol></details></li><li class="section no-link">Inheritance</li><li class="section"><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object"><code>Object/Function</code></a></li><li><details><summary>Static methods</summary><ol><li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/apply"><code>Function.prototype.apply()</code></a></li><li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/bind"><code>Function.prototype.bind()</code></a></li><li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/call"><code>Function.prototype.call()</code></a></li><li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/Symbol.hasInstance"><code>Function.prototype[Symbol.hasInstance]()</code></a></li><li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/toString"><code>Function.prototype.toString()</code></a></li></ol></details></li><li><details><summary>Static properties</summary><ol><li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/arguments"><code>Function.prototype.arguments</code></a><abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">Non-standard</span> </abbr><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">Deprecated</span> </abbr></li><li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/caller"><code>Function.prototype.caller</code></a><abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">Non-standard</span> </abbr><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">Deprecated</span> </abbr></li><li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/displayName"><code>Function: displayName</code></a><abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">Non-standard</span> </abbr></li><li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/length"><code>Function: length</code></a></li><li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name"><code>Function: name</code></a></li><li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/prototype"><code>Function: prototype</code></a></li></ol></details></li><li><details open=""><summary>Instance methods</summary><ol><li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/__defineGetter__"><code>Object.prototype.__defineGetter__()</code></a><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">Deprecated</span> </abbr></li><li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/__defineSetter__"><code>Object.prototype.__defineSetter__()</code></a><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">Deprecated</span> </abbr></li><li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/__lookupGetter__"><code>Object.prototype.__lookupGetter__()</code></a><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">Deprecated</span> </abbr></li><li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/__lookupSetter__"><code>Object.prototype.__lookupSetter__()</code></a><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">Deprecated</span> </abbr></li><li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/hasOwnProperty"><code>Object.prototype.hasOwnProperty()</code></a></li><li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/isPrototypeOf"><code>Object.prototype.isPrototypeOf()</code></a></li><li><em><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/propertyIsEnumerable" aria-current="page"><code>Object.prototype.propertyIsEnumerable()</code></a></em></li><li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/toLocaleString"><code>Object.prototype.toLocaleString()</code></a></li><li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/toString"><code>Object.prototype.toString()</code></a></li><li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/valueOf"><code>Object.prototype.valueOf()</code></a></li></ol></details></li><li><details><summary>Instance properties</summary><ol><li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/constructor"><code>Object.prototype.constructor</code></a></li><li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/proto"><code>Object.prototype.__proto__</code></a><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">Deprecated</span> </abbr></li></ol></details></li></ol></div></div><section class="place side"></section></nav></aside><div class="toc-container"><aside class="toc"><nav><div class="document-toc-container"><section class="document-toc"><header><h2 class="document-toc-heading">In this article</h2></header><ul class="document-toc-list"><li class="document-toc-item "><a class="document-toc-link" href="#try_it">Try it</a></li><li class="document-toc-item "><a class="document-toc-link" href="#syntax">Syntax</a></li><li class="document-toc-item "><a class="document-toc-link" href="#description">Description</a></li><li class="document-toc-item "><a class="document-toc-link" href="#examples">Examples</a></li><li class="document-toc-item "><a class="document-toc-link" href="#specifications">Specifications</a></li><li class="document-toc-item "><a class="document-toc-link" href="#browser_compatibility">Browser compatibility</a></li><li class="document-toc-item "><a class="document-toc-link" href="#see_also">See also</a></li></ul></section></div></nav></aside><section class="place side"></section></div></div><main id="content" class="main-content "><article class="main-page-content" lang="en-US"><header><h1>Object.prototype.propertyIsEnumerable()</h1><details class="baseline-indicator high"><summary><span class="indicator" role="img" aria-label="Baseline Check"></span><h2>Baseline <span class="not-bold">Widely available</span></h2><div class="browsers"><span class="engine" title="Supported in Chrome and Edge"><span class="browser chrome supported" role="img" aria-label="Chrome check"></span><span class="browser edge supported" role="img" aria-label="Edge check"></span></span><span class="engine" title="Supported in Firefox"><span class="browser firefox supported" role="img" aria-label="Firefox check"></span></span><span class="engine" title="Supported in Safari"><span class="browser safari supported" role="img" aria-label="Safari check"></span></span></div><span class="icon icon-chevron "></span></summary><div class="extra"><p>This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.</p><ul><li><a href="/en-US/docs/Glossary/Baseline/Compatibility" data-glean="baseline_link_learn_more" target="_blank" class="learn-more">Learn more</a></li><li><a href="#browser_compatibility" data-glean="baseline_link_bcd_table">See full compatibility</a></li><li><a href="https://survey.alchemer.com/s3/7634825/MDN-baseline-feedback?page=%2Fen-US%2Fdocs%2FWeb%2FJavaScript%2FReference%2FGlobal_Objects%2FObject%2FpropertyIsEnumerable&level=high" data-glean="baseline_link_feedback" class="feedback-link" target="_blank" rel="noreferrer">Report feedback</a></li></ul></div></details></header><div class="section-content"><p>The <strong><code>propertyIsEnumerable()</code></strong> method of <a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object"><code>Object</code></a> instances returns a boolean indicating whether the specified property is this object's <a href="/en-US/docs/Web/JavaScript/Enumerability_and_ownership_of_properties">enumerable own</a> property.</p></div><section aria-labelledby="try_it"><h2 id="try_it"><a href="#try_it">Try it</a></h2><div class="section-content"><iframe class="interactive is-taller-height" height="200" src="https://interactive-examples.mdn.mozilla.net/pages/js/object-prototype-propertyisenumerable.html" title="MDN Web Docs Interactive Example" allow="clipboard-write" loading="lazy"></iframe></div></section><section aria-labelledby="syntax"><h2 id="syntax"><a href="#syntax">Syntax</a></h2><div class="section-content"><div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js notranslate"><code>propertyIsEnumerable(prop) </code></pre></div></div></section><section aria-labelledby="parameters"><h3 id="parameters"><a href="#parameters">Parameters</a></h3><div class="section-content"><dl> <dt id="prop"><a href="#prop"><code>prop</code></a></dt> <dd> <p>The name of the property to test. Can be a string or a <a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol"><code>Symbol</code></a>.</p> </dd> </dl></div></section><section aria-labelledby="return_value"><h3 id="return_value"><a href="#return_value">Return value</a></h3><div class="section-content"><p>A boolean value indicating whether the specified property is enumerable and is the object's own property.</p></div></section><section aria-labelledby="description"><h2 id="description"><a href="#description">Description</a></h2><div class="section-content"><p>All objects that inherit from <code>Object.prototype</code> (that is, all except <a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object#null-prototype_objects"><code>null</code>-prototype objects</a>) inherit the <code>propertyIsEnumerable()</code> method. This method determines if the specified property, string or symbol, is an enumerable own property of the object. If the object does not have the specified property, this method returns <code>false</code>.</p> <p>This method is equivalent to <a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/getOwnPropertyDescriptor"><code>Object.getOwnPropertyDescriptor(obj, prop)?.enumerable ?? false</code></a>.</p></div></section><section aria-labelledby="examples"><h2 id="examples"><a href="#examples">Examples</a></h2><div class="section-content"></div></section><section aria-labelledby="using_propertyisenumerable"><h3 id="using_propertyisenumerable"><a href="#using_propertyisenumerable">Using propertyIsEnumerable()</a></h3><div class="section-content"><p>The following example shows the use of <code>propertyIsEnumerable()</code> on objects and arrays.</p> <div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js notranslate"><code>const o = {}; const a = []; o.prop = "is enumerable"; a[0] = "is enumerable"; o.propertyIsEnumerable("prop"); // true a.propertyIsEnumerable(0); // true </code></pre></div></div></section><section aria-labelledby="user-defined_vs._built-in_objects"><h3 id="user-defined_vs._built-in_objects"><a href="#user-defined_vs._built-in_objects">User-defined vs. built-in objects</a></h3><div class="section-content"><p>Most built-in properties are non-enumerable by default, while user-created object properties are often enumerable, unless explicitly designated otherwise.</p> <div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js notranslate"><code>const a = ["is enumerable"]; a.propertyIsEnumerable(0); // true a.propertyIsEnumerable("length"); // false Math.propertyIsEnumerable("random"); // false globalThis.propertyIsEnumerable("Math"); // false </code></pre></div></div></section><section aria-labelledby="direct_vs._inherited_properties"><h3 id="direct_vs._inherited_properties"><a href="#direct_vs._inherited_properties">Direct vs. inherited properties</a></h3><div class="section-content"><p>Only enumerable own properties cause <code>propertyIsEnumerable()</code> to return <code>true</code>, although all enumerable properties, including inherited ones, are visited by the <a href="/en-US/docs/Web/JavaScript/Reference/Statements/for...in"><code>for...in</code></a> loop.</p> <div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js notranslate"><code>const o1 = { enumerableInherited: "is enumerable", }; Object.defineProperty(o1, "nonEnumerableInherited", { value: "is non-enumerable", enumerable: false, }); const o2 = { // o1 is the prototype of o2 __proto__: o1, enumerableOwn: "is enumerable", }; Object.defineProperty(o2, "nonEnumerableOwn", { value: "is non-enumerable", enumerable: false, }); o2.propertyIsEnumerable("enumerableInherited"); // false o2.propertyIsEnumerable("nonEnumerableInherited"); // false o2.propertyIsEnumerable("enumerableOwn"); // true o2.propertyIsEnumerable("nonEnumerableOwn"); // false </code></pre></div></div></section><section aria-labelledby="testing_symbol_properties"><h3 id="testing_symbol_properties"><a href="#testing_symbol_properties">Testing symbol properties</a></h3><div class="section-content"><p><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol"><code>Symbol</code></a> properties are also supported by <code>propertyIsEnumerable()</code>. Note that most enumeration methods only visit string properties; enumerability of symbol properties is only useful when using <a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign"><code>Object.assign()</code></a> or <a href="/en-US/docs/Web/JavaScript/Reference/Operators/Spread_syntax">spread syntax</a>. For more information, see <a href="/en-US/docs/Web/JavaScript/Enumerability_and_ownership_of_properties">Enumerability and ownership of properties</a>.</p> <div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js notranslate"><code>const sym = Symbol("enumerable"); const sym2 = Symbol("non-enumerable"); const o = { [sym]: "is enumerable", }; Object.defineProperty(o, sym2, { value: "is non-enumerable", enumerable: false, }); o.propertyIsEnumerable(sym); // true o.propertyIsEnumerable(sym2); // false </code></pre></div></div></section><section aria-labelledby="usage_with_null-prototype_objects"><h3 id="usage_with_null-prototype_objects"><a href="#usage_with_null-prototype_objects">Usage with null-prototype objects</a></h3><div class="section-content"><p>Because <code>null</code>-prototype objects do not inherit from <code>Object.prototype</code>, they do not inherit the <code>propertyIsEnumerable()</code> method. You must call <code>Object.prototype.propertyIsEnumerable</code> with the object as <code>this</code> instead.</p> <div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js notranslate"><code>const o = { __proto__: null, enumerableOwn: "is enumerable", }; o.propertyIsEnumerable("enumerableOwn"); // TypeError: o.propertyIsEnumerable is not a function Object.prototype.propertyIsEnumerable.call(o, "enumerableOwn"); // true </code></pre></div> <p>Alternatively, you may use <a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/getOwnPropertyDescriptor"><code>Object.getOwnPropertyDescriptor()</code></a> instead, which also helps to distinguish between non-existent properties and actually non-enumerable properties.</p> <div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js notranslate"><code>const o = { __proto__: null, enumerableOwn: "is enumerable", }; Object.getOwnPropertyDescriptor(o, "enumerableOwn")?.enumerable; // true Object.getOwnPropertyDescriptor(o, "nonExistent")?.enumerable; // undefined </code></pre></div></div></section><h2 id="specifications"><a href="#specifications">Specifications</a></h2><table class="standard-table"><thead><tr><th scope="col">Specification</th></tr></thead><tbody><tr><td><a href="https://tc39.es/ecma262/multipage/fundamental-objects.html#sec-object.prototype.propertyisenumerable">ECMAScript Language Specification <br/><small># sec-object.prototype.propertyisenumerable</small></a></td></tr></tbody></table><h2 id="browser_compatibility"><a href="#browser_compatibility">Browser compatibility</a></h2><p>BCD tables only load in the browser<noscript> with JavaScript enabled. Enable JavaScript to view data.</noscript></p><section aria-labelledby="see_also"><h2 id="see_also"><a href="#see_also">See also</a></h2><div class="section-content"><ul> <li><a href="/en-US/docs/Web/JavaScript/Enumerability_and_ownership_of_properties">Enumerability and ownership of properties</a></li> <li><a href="/en-US/docs/Web/JavaScript/Reference/Statements/for...in"><code>for...in</code></a></li> <li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/keys"><code>Object.keys()</code></a></li> <li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/defineProperty"><code>Object.defineProperty()</code></a></li> </ul></div></section></article><aside class="article-footer"><div class="article-footer-inner"><div class="svg-container"><svg xmlns="http://www.w3.org/2000/svg" width="162" height="162" viewBox="0 0 162 162" fill="none" role="none"><mask id="b" fill="#fff"><path d="M97.203 47.04c8.113-7.886 18.004-13.871 28.906-17.492a78 78 0 0 1 33.969-3.39c11.443 1.39 22.401 5.295 32.024 11.411s17.656 14.28 23.476 23.86c5.819 9.579 9.269 20.318 10.083 31.385a69.85 69.85 0 0 1-5.387 32.44c-4.358 10.272-11.115 19.443-19.747 26.801-8.632 7.359-18.908 12.709-30.034 15.637l-6.17-21.698c7.666-2.017 14.746-5.703 20.694-10.773 5.948-5.071 10.603-11.389 13.606-18.467a48.14 48.14 0 0 0 3.712-22.352c-.561-7.625-2.938-15.025-6.948-21.625s-9.544-12.226-16.175-16.44-14.181-6.904-22.065-7.863a53.75 53.75 0 0 0-23.405 2.336c-7.513 2.495-14.327 6.62-19.918 12.053z"></path></mask><path stroke="url(#a)" stroke-dasharray="6, 6" stroke-width="2" d="M97.203 47.04c8.113-7.886 18.004-13.871 28.906-17.492a78 78 0 0 1 33.969-3.39c11.443 1.39 22.401 5.295 32.024 11.411s17.656 14.28 23.476 23.86c5.819 9.579 9.269 20.318 10.083 31.385a69.85 69.85 0 0 1-5.387 32.44c-4.358 10.272-11.115 19.443-19.747 26.801-8.632 7.359-18.908 12.709-30.034 15.637l-6.17-21.698c7.666-2.017 14.746-5.703 20.694-10.773 5.948-5.071 10.603-11.389 13.606-18.467a48.14 48.14 0 0 0 3.712-22.352c-.561-7.625-2.938-15.025-6.948-21.625s-9.544-12.226-16.175-16.44-14.181-6.904-22.065-7.863a53.75 53.75 0 0 0-23.405 2.336c-7.513 2.495-14.327 6.62-19.918 12.053z" mask="url(#b)" style="stroke:url(#a)" transform="translate(-63.992 -25.587)"></path><ellipse cx="8.066" cy="111.597" fill="var(--background-tertiary)" rx="53.677" ry="53.699" transform="matrix(.71707 -.697 .7243 .6895 0 0)"></ellipse><g clip-path="url(#c)" transform="translate(-63.992 -25.587)"><path fill="#9abff5" d="m144.256 137.379 32.906 12.434a4.41 4.41 0 0 1 2.559 5.667l-9.326 24.679a4.41 4.41 0 0 1-5.667 2.559l-8.226-3.108-2.332 6.17c-.466 1.233-.375 1.883-1.609 1.417l-2.253-.527c-.411-.155-.95-.594-1.206-1.161l-4.734-10.484-12.545-4.741a4.41 4.41 0 0 1-2.559-5.667l9.325-24.679a4.41 4.41 0 0 1 5.667-2.559m9.961 29.617 8.227 3.108 3.264-8.638-.498-6.768-4.113-1.555.548 7.258-4.319-1.632zm-12.339-4.663 8.226 3.108 3.264-8.637-.498-6.769-4.113-1.554.548 7.257-4.319-1.632z"></path></g><g clip-path="url(#d)" transform="translate(-63.992 -25.587)"><path fill="#81b0f3" d="M135.35 60.136 86.67 41.654c-3.346-1.27-7.124.428-8.394 3.775L64.414 81.938c-1.27 3.347.428 7.125 3.774 8.395l12.17 4.62-3.465 9.128c-.693 1.826-1.432 2.457.394 3.15l3.014 1.625c.609.231 1.637.274 2.477-.104l15.53-6.983 18.56 7.047c3.346 1.27 7.124-.428 8.395-3.775l13.862-36.51c1.27-3.346-.428-7.124-3.775-8.395M95.261 83.207l-12.17-4.62 4.852-12.779 7.19-7.017 6.085 2.31-7.725 7.51 6.389 2.426zm18.255 6.93-12.17-4.62 4.852-12.778 7.189-7.017 6.085 2.31-7.725 7.51 6.39 2.426z"></path></g><defs><clipPath id="c"><path fill="#fff" d="m198.638 146.586-65.056-24.583-24.583 65.057 65.056 24.582z"></path></clipPath><clipPath id="d"><path fill="#fff" d="m66.438 14.055 96.242 36.54-36.54 96.243-96.243-36.54z"></path></clipPath><linearGradient id="a" x1="97.203" x2="199.995" y1="47.04" y2="152.793" gradientUnits="userSpaceOnUse"><stop stop-color="#086DFC"></stop><stop offset="0.246" stop-color="#2C81FA"></stop><stop offset="0.516" stop-color="#5497F8"></stop><stop offset="0.821" stop-color="#80B0F6"></stop><stop offset="1" stop-color="#9ABFF5"></stop></linearGradient></defs></svg></div><h2>Help improve MDN</h2><fieldset class="feedback"><label>Was this page helpful to you?</label><div class="button-container"><button type="button" class="button primary has-icon yes"><span class="button-wrap"><span class="icon icon-thumbs-up "></span>Yes</span></button><button type="button" class="button primary has-icon no"><span class="button-wrap"><span class="icon icon-thumbs-down "></span>No</span></button></div></fieldset><a class="contribute" href="https://github.com/mdn/content/blob/main/CONTRIBUTING.md" title="This will take you to our contribution guidelines on GitHub." target="_blank" rel="noopener noreferrer">Learn how to contribute</a>.<p class="last-modified-date">This page was last modified on <time dateTime="2023-08-09T10:45:23.000Z">Aug 9, 2023</time> by <a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/propertyIsEnumerable/contributors.txt" rel="nofollow">MDN contributors</a>.</p><div id="on-github" class="on-github"><a href="https://github.com/mdn/content/blob/main/files/en-us/web/javascript/reference/global_objects/object/propertyisenumerable/index.md?plain=1" title="Folder: en-us/web/javascript/reference/global_objects/object/propertyisenumerable (Opens in a new tab)" target="_blank" rel="noopener noreferrer">View this page on GitHub</a> • <a href="https://github.com/mdn/content/issues/new?template=page-report.yml&mdn-url=https%3A%2F%2Fdeveloper.mozilla.org%2Fen-US%2Fdocs%2FWeb%2FJavaScript%2FReference%2FGlobal_Objects%2FObject%2FpropertyIsEnumerable&metadata=%3C%21--+Do+not+make+changes+below+this+line+--%3E%0A%3Cdetails%3E%0A%3Csummary%3EPage+report+details%3C%2Fsummary%3E%0A%0A*+Folder%3A+%60en-us%2Fweb%2Fjavascript%2Freference%2Fglobal_objects%2Fobject%2Fpropertyisenumerable%60%0A*+MDN+URL%3A+https%3A%2F%2Fdeveloper.mozilla.org%2Fen-US%2Fdocs%2FWeb%2FJavaScript%2FReference%2FGlobal_Objects%2FObject%2FpropertyIsEnumerable%0A*+GitHub+URL%3A+https%3A%2F%2Fgithub.com%2Fmdn%2Fcontent%2Fblob%2Fmain%2Ffiles%2Fen-us%2Fweb%2Fjavascript%2Freference%2Fglobal_objects%2Fobject%2Fpropertyisenumerable%2Findex.md%0A*+Last+commit%3A+https%3A%2F%2Fgithub.com%2Fmdn%2Fcontent%2Fcommit%2F5e878acadb7afcf0443b619b1d2f70a4dfafd679%0A*+Document+last+modified%3A+2023-08-09T10%3A45%3A23.000Z%0A%0A%3C%2Fdetails%3E" title="This will take you to GitHub to file a new issue." target="_blank" rel="noopener noreferrer">Report a problem with this content</a></div></div></aside></main></div></div><footer id="nav-footer" class="page-footer"><div class="page-footer-grid"><div class="page-footer-logo-col"><a href="/" class="mdn-footer-logo" aria-label="MDN homepage"><svg width="48" height="17" viewBox="0 0 48 17" fill="none" xmlns="http://www.w3.org/2000/svg"><title id="mdn-footer-logo-svg">MDN logo</title><path d="M20.04 16.512H15.504V10.416C15.504 9.488 15.344 8.824 15.024 8.424C14.72 8.024 14.264 7.824 13.656 7.824C12.92 7.824 12.384 8.064 12.048 8.544C11.728 9.024 11.568 9.64 11.568 10.392V14.184H13.008V16.512H8.472V10.416C8.472 9.488 8.312 8.824 7.992 8.424C7.688 8.024 7.232 7.824 6.624 7.824C5.872 7.824 5.336 8.064 5.016 8.544C4.696 9.024 4.536 9.64 4.536 10.392V14.184H6.6V16.512H0V14.184H1.44V8.04H0.024V5.688H4.536V7.32C5.224 6.088 6.32 5.472 7.824 5.472C8.608 5.472 9.328 5.664 9.984 6.048C10.64 6.432 11.096 7.016 11.352 7.8C11.992 6.248 13.168 5.472 14.88 5.472C15.856 5.472 16.72 5.776 17.472 6.384C18.224 6.992 18.6 7.936 18.6 9.216V14.184H20.04V16.512Z" fill="currentColor"></path><path d="M33.6714 16.512H29.1354V14.496C28.8314 15.12 28.3834 15.656 27.7914 16.104C27.1994 16.536 26.4154 16.752 25.4394 16.752C24.0154 16.752 22.8954 16.264 22.0794 15.288C21.2634 14.312 20.8554 12.984 20.8554 11.304C20.8554 9.688 21.2554 8.312 22.0554 7.176C22.8554 6.04 24.0634 5.472 25.6794 5.472C26.5594 5.472 27.2794 5.648 27.8394 6C28.3994 6.352 28.8314 6.8 29.1354 7.344V2.352H26.9754V0H32.2314V14.184H33.6714V16.512ZM29.1354 11.04V10.776C29.1354 9.88 28.8954 9.184 28.4154 8.688C27.9514 8.176 27.3674 7.92 26.6634 7.92C25.9754 7.92 25.3674 8.176 24.8394 8.688C24.3274 9.2 24.0714 10.008 24.0714 11.112C24.0714 12.152 24.3114 12.944 24.7914 13.488C25.2714 14.032 25.8394 14.304 26.4954 14.304C27.3114 14.304 27.9514 13.96 28.4154 13.272C28.8954 12.584 29.1354 11.84 29.1354 11.04Z" fill="currentColor"></path><path d="M47.9589 16.512H41.9829V14.184H43.4229V10.416C43.4229 9.488 43.2629 8.824 42.9429 8.424C42.6389 8.024 42.1829 7.824 41.5749 7.824C40.8389 7.824 40.2709 8.056 39.8709 8.52C39.4709 8.968 39.2629 9.56 39.2469 10.296V14.184H40.6869V16.512H34.7109V14.184H36.1509V8.04H34.5909V5.688H39.2469V7.344C39.9669 6.096 41.1269 5.472 42.7269 5.472C43.7509 5.472 44.6389 5.776 45.3909 6.384C46.1429 6.992 46.5189 7.936 46.5189 9.216V14.184H47.9589V16.512Z" fill="currentColor"></path></svg></a><p>Your blueprint for a better internet.</p><ul class="social-icons"><li><a href="https://mozilla.social/@mdn" target="_blank" rel="me noopener noreferrer"><span class="icon icon-mastodon"></span><span class="visually-hidden">MDN on Mastodon</span></a></li><li><a href="https://twitter.com/mozdevnet" target="_blank" rel="noopener noreferrer"><span class="icon icon-twitter-x"></span><span class="visually-hidden">MDN on X (formerly Twitter)</span></a></li><li><a href="https://github.com/mdn/" target="_blank" rel="noopener noreferrer"><span class="icon icon-github-mark-small"></span><span class="visually-hidden">MDN on GitHub</span></a></li><li><a href="/en-US/blog/rss.xml" target="_blank"><span class="icon icon-feed"></span><span class="visually-hidden">MDN Blog RSS Feed</span></a></li></ul></div><div class="page-footer-nav-col-1"><h2 class="footer-nav-heading">MDN</h2><ul class="footer-nav-list"><li class="footer-nav-item"><a href="/en-US/about">About</a></li><li class="footer-nav-item"><a href="/en-US/blog/">Blog</a></li><li class="footer-nav-item"><a href="https://www.mozilla.org/en-US/careers/listings/?team=ProdOps" target="_blank" rel="noopener noreferrer">Careers</a></li><li class="footer-nav-item"><a href="/en-US/advertising">Advertise with us</a></li></ul></div><div class="page-footer-nav-col-2"><h2 class="footer-nav-heading">Support</h2><ul class="footer-nav-list"><li class="footer-nav-item"><a class="footer-nav-link" href="https://support.mozilla.org/products/mdn-plus">Product help</a></li><li class="footer-nav-item"><a class="footer-nav-link" href="/en-US/docs/MDN/Community/Issues">Report an issue</a></li></ul></div><div class="page-footer-nav-col-3"><h2 class="footer-nav-heading">Our communities</h2><ul class="footer-nav-list"><li class="footer-nav-item"><a class="footer-nav-link" href="/en-US/community">MDN Community</a></li><li class="footer-nav-item"><a class="footer-nav-link" href="https://discourse.mozilla.org/c/mdn/236" target="_blank" rel="noopener noreferrer">MDN Forum</a></li><li class="footer-nav-item"><a class="footer-nav-link" href="/discord" target="_blank" rel="noopener noreferrer">MDN Chat</a></li></ul></div><div class="page-footer-nav-col-4"><h2 class="footer-nav-heading">Developers</h2><ul class="footer-nav-list"><li class="footer-nav-item"><a class="footer-nav-link" href="/en-US/docs/Web">Web Technologies</a></li><li class="footer-nav-item"><a class="footer-nav-link" href="/en-US/docs/Learn">Learn Web Development</a></li><li class="footer-nav-item"><a class="footer-nav-link" href="/en-US/plus">MDN Plus</a></li><li class="footer-nav-item"><a href="https://hacks.mozilla.org/" target="_blank" rel="noopener noreferrer">Hacks Blog</a></li></ul></div><div class="page-footer-moz"><a href="https://www.mozilla.org/" class="footer-moz-logo-link" target="_blank" rel="noopener noreferrer"><svg width="112" height="32" fill="none" xmlns="http://www.w3.org/2000/svg"><title id="mozilla-footer-logo-svg">Mozilla logo</title><path d="M41.753 14.218c-2.048 0-3.324 1.522-3.324 4.157 0 2.423 1.119 4.286 3.29 4.286 2.082 0 3.447-1.678 3.447-4.347 0-2.826-1.522-4.096-3.413-4.096Zm54.89 7.044c0 .901.437 1.618 1.645 1.618 1.427 0 2.949-1.024 3.044-3.352-.649-.095-1.365-.185-2.02-.185-1.426-.005-2.668.397-2.668 1.92Z" fill="currentColor"></path><path d="M0 0v32h111.908V0H0Zm32.56 25.426h-5.87v-7.884c0-2.423-.806-3.352-2.39-3.352-1.924 0-2.702 1.365-2.702 3.324v4.868h1.864v3.044h-5.864v-7.884c0-2.423-.806-3.352-2.39-3.352-1.924 0-2.702 1.365-2.702 3.324v4.868h2.669v3.044H6.642v-3.044h1.863v-7.918H6.642V11.42h5.864v2.11c.839-1.489 2.3-2.39 4.252-2.39 2.02 0 3.878.963 4.566 3.01.778-1.862 2.361-3.01 4.566-3.01 2.512 0 4.812 1.522 4.812 4.84v6.402h1.863v3.044h-.005Zm9.036.307c-4.314 0-7.296-2.635-7.296-7.106 0-4.096 2.484-7.481 7.514-7.481s7.481 3.38 7.481 7.29c0 4.472-3.228 7.297-7.699 7.297Zm22.578-.307H51.942l-.403-2.11 7.7-8.846h-4.376l-.621 2.17-2.888-.313.498-4.907h12.294l.313 2.11-7.767 8.852h4.533l.654-2.172 3.167.308-.872 4.908Zm7.99 0h-4.191v-5.03h4.19v5.03Zm0-8.976h-4.191v-5.03h4.19v5.03Zm2.618 8.976 6.054-21.358h3.945l-6.054 21.358h-3.945Zm8.136 0 6.048-21.358h3.945l-6.054 21.358h-3.939Zm21.486.307c-1.863 0-2.887-1.085-3.072-2.792-.805 1.427-2.232 2.792-4.498 2.792-2.02 0-4.314-1.085-4.314-4.006 0-3.447 3.323-4.253 6.518-4.253.778 0 1.584.034 2.3.124v-.465c0-1.427-.034-3.133-2.3-3.133-.84 0-1.488.061-2.143.402l-.453 1.578-3.195-.34.549-3.224c2.45-.996 3.692-1.27 5.992-1.27 3.01 0 5.556 1.55 5.556 4.75v6.083c0 .805.314 1.085.963 1.085.184 0 .375-.034.587-.095l.034 2.11a5.432 5.432 0 0 1-2.524.654Z" fill="currentColor"></path></svg></a><ul class="footer-moz-list"><li class="footer-moz-item"><a href="https://www.mozilla.org/privacy/websites/" class="footer-moz-link" target="_blank" rel="noopener noreferrer">Website Privacy Notice</a></li><li class="footer-moz-item"><a href="https://www.mozilla.org/privacy/websites/#cookies" class="footer-moz-link" target="_blank" rel="noopener noreferrer">Cookies</a></li><li class="footer-moz-item"><a href="https://www.mozilla.org/about/legal/terms/mozilla" class="footer-moz-link" target="_blank" rel="noopener noreferrer">Legal</a></li><li class="footer-moz-item"><a href="https://www.mozilla.org/about/governance/policies/participation/" class="footer-moz-link" target="_blank" rel="noopener noreferrer">Community Participation Guidelines</a></li></ul></div><div class="page-footer-legal"><p id="license" class="page-footer-legal-text">Visit <a href="https://www.mozilla.org" target="_blank" rel="noopener noreferrer">Mozilla Corporation’s</a> not-for-profit parent, the <a target="_blank" rel="noopener noreferrer" href="https://foundation.mozilla.org/">Mozilla Foundation</a>.<br/>Portions of this content are ©1998–2024 by individual mozilla.org contributors. Content available under <a href="/en-US/docs/MDN/Writing_guidelines/Attrib_copyright_license">a Creative Commons license</a>.</p></div></div></footer></div><script type="application/json" id="hydration">{"url":"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/propertyIsEnumerable","doc":{"isMarkdown":true,"isTranslated":false,"isActive":true,"flaws":{},"title":"Object.prototype.propertyIsEnumerable()","mdn_url":"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/propertyIsEnumerable","locale":"en-US","native":"English (US)","browserCompat":["javascript.builtins.Object.propertyIsEnumerable"],"baseline":{"baseline":"high","baseline_high_date":"2018-01-29","baseline_low_date":"2015-07-29","support":{"chrome":"1","chrome_android":"18","edge":"12","firefox":"1","firefox_android":"4","safari":"1","safari_ios":"1"}},"sidebarHTML":"<ol><li class=\"section\"><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects\">Standard built-in objects</a></li><li class=\"section\"><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object\"><code>Object</code></a></li><li><details open=\"\"><summary>Constructor</summary><ol><li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/Object\"><code>Object() constructor</code></a></li></ol></details></li><li><details open=\"\"><summary>Static methods</summary><ol><li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign\"><code>Object.assign()</code></a></li><li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/create\"><code>Object.create()</code></a></li><li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/defineProperties\"><code>Object.defineProperties()</code></a></li><li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/defineProperty\"><code>Object.defineProperty()</code></a></li><li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/entries\"><code>Object.entries()</code></a></li><li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/freeze\"><code>Object.freeze()</code></a></li><li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/fromEntries\"><code>Object.fromEntries()</code></a></li><li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/getOwnPropertyDescriptor\"><code>Object.getOwnPropertyDescriptor()</code></a></li><li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/getOwnPropertyDescriptors\"><code>Object.getOwnPropertyDescriptors()</code></a></li><li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/getOwnPropertyNames\"><code>Object.getOwnPropertyNames()</code></a></li><li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/getOwnPropertySymbols\"><code>Object.getOwnPropertySymbols()</code></a></li><li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/getPrototypeOf\"><code>Object.getPrototypeOf()</code></a></li><li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/groupBy\"><code>Object.groupBy()</code></a></li><li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/hasOwn\"><code>Object.hasOwn()</code></a></li><li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/is\"><code>Object.is()</code></a></li><li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/isExtensible\"><code>Object.isExtensible()</code></a></li><li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/isFrozen\"><code>Object.isFrozen()</code></a></li><li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/isSealed\"><code>Object.isSealed()</code></a></li><li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/keys\"><code>Object.keys()</code></a></li><li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/preventExtensions\"><code>Object.preventExtensions()</code></a></li><li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/seal\"><code>Object.seal()</code></a></li><li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/setPrototypeOf\"><code>Object.setPrototypeOf()</code></a></li><li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/values\"><code>Object.values()</code></a></li></ol></details></li><li><details open=\"\"><summary>Instance methods</summary><ol><li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/__defineGetter__\"><code>Object.prototype.__defineGetter__()</code></a><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n <span class=\"visually-hidden\">Deprecated</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/__defineSetter__\"><code>Object.prototype.__defineSetter__()</code></a><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n <span class=\"visually-hidden\">Deprecated</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/__lookupGetter__\"><code>Object.prototype.__lookupGetter__()</code></a><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n <span class=\"visually-hidden\">Deprecated</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/__lookupSetter__\"><code>Object.prototype.__lookupSetter__()</code></a><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n <span class=\"visually-hidden\">Deprecated</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/hasOwnProperty\"><code>Object.prototype.hasOwnProperty()</code></a></li><li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/isPrototypeOf\"><code>Object.prototype.isPrototypeOf()</code></a></li><li><em><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/propertyIsEnumerable\" aria-current=\"page\"><code>Object.prototype.propertyIsEnumerable()</code></a></em></li><li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/toLocaleString\"><code>Object.prototype.toLocaleString()</code></a></li><li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/toString\"><code>Object.prototype.toString()</code></a></li><li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/valueOf\"><code>Object.prototype.valueOf()</code></a></li></ol></details></li><li><details open=\"\"><summary>Instance properties</summary><ol><li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/constructor\"><code>Object.prototype.constructor</code></a></li><li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/proto\"><code>Object.prototype.__proto__</code></a><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n <span class=\"visually-hidden\">Deprecated</span>\n</abbr></li></ol></details></li><li class=\"section no-link\">Inheritance</li><li class=\"section\"><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object\"><code>Object/Function</code></a></li><li><details><summary>Static methods</summary><ol><li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/apply\"><code>Function.prototype.apply()</code></a></li><li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/bind\"><code>Function.prototype.bind()</code></a></li><li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/call\"><code>Function.prototype.call()</code></a></li><li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/Symbol.hasInstance\"><code>Function.prototype[Symbol.hasInstance]()</code></a></li><li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/toString\"><code>Function.prototype.toString()</code></a></li></ol></details></li><li><details><summary>Static properties</summary><ol><li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/arguments\"><code>Function.prototype.arguments</code></a><abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n <span class=\"visually-hidden\">Non-standard</span>\n</abbr><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n <span class=\"visually-hidden\">Deprecated</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/caller\"><code>Function.prototype.caller</code></a><abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n <span class=\"visually-hidden\">Non-standard</span>\n</abbr><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n <span class=\"visually-hidden\">Deprecated</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/displayName\"><code>Function: displayName</code></a><abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n <span class=\"visually-hidden\">Non-standard</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/length\"><code>Function: length</code></a></li><li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name\"><code>Function: name</code></a></li><li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/prototype\"><code>Function: prototype</code></a></li></ol></details></li><li><details open=\"\"><summary>Instance methods</summary><ol><li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/__defineGetter__\"><code>Object.prototype.__defineGetter__()</code></a><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n <span class=\"visually-hidden\">Deprecated</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/__defineSetter__\"><code>Object.prototype.__defineSetter__()</code></a><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n <span class=\"visually-hidden\">Deprecated</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/__lookupGetter__\"><code>Object.prototype.__lookupGetter__()</code></a><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n <span class=\"visually-hidden\">Deprecated</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/__lookupSetter__\"><code>Object.prototype.__lookupSetter__()</code></a><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n <span class=\"visually-hidden\">Deprecated</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/hasOwnProperty\"><code>Object.prototype.hasOwnProperty()</code></a></li><li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/isPrototypeOf\"><code>Object.prototype.isPrototypeOf()</code></a></li><li><em><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/propertyIsEnumerable\" aria-current=\"page\"><code>Object.prototype.propertyIsEnumerable()</code></a></em></li><li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/toLocaleString\"><code>Object.prototype.toLocaleString()</code></a></li><li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/toString\"><code>Object.prototype.toString()</code></a></li><li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/valueOf\"><code>Object.prototype.valueOf()</code></a></li></ol></details></li><li><details><summary>Instance properties</summary><ol><li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/constructor\"><code>Object.prototype.constructor</code></a></li><li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/proto\"><code>Object.prototype.__proto__</code></a><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n <span class=\"visually-hidden\">Deprecated</span>\n</abbr></li></ol></details></li></ol>","sidebarMacro":"JSRef","body":[{"type":"prose","value":{"id":null,"title":null,"isH3":false,"content":"<p>The <strong><code>propertyIsEnumerable()</code></strong> method of <a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object\"><code>Object</code></a> instances returns a boolean indicating whether the specified property is this object's <a href=\"/en-US/docs/Web/JavaScript/Enumerability_and_ownership_of_properties\">enumerable own</a> property.</p>"}},{"type":"prose","value":{"id":"try_it","title":"Try it","isH3":false,"content":"<iframe class=\"interactive is-taller-height\" height=\"200\" src=\"https://interactive-examples.mdn.mozilla.net/pages/js/object-prototype-propertyisenumerable.html\" title=\"MDN Web Docs Interactive Example\" allow=\"clipboard-write\" loading=\"lazy\"></iframe>"}},{"type":"prose","value":{"id":"syntax","title":"Syntax","isH3":false,"content":"<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>propertyIsEnumerable(prop)\n</code></pre></div>"}},{"type":"prose","value":{"id":"parameters","title":"Parameters","isH3":true,"content":"<dl>\n <dt id=\"prop\"><a href=\"#prop\"><code>prop</code></a></dt>\n <dd>\n <p>The name of the property to test. Can be a string or a <a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol\"><code>Symbol</code></a>.</p>\n </dd>\n</dl>"}},{"type":"prose","value":{"id":"return_value","title":"Return value","isH3":true,"content":"<p>A boolean value indicating whether the specified property is enumerable and is the object's own property.</p>"}},{"type":"prose","value":{"id":"description","title":"Description","isH3":false,"content":"<p>All objects that inherit from <code>Object.prototype</code> (that is, all except <a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object#null-prototype_objects\"><code>null</code>-prototype objects</a>) inherit the <code>propertyIsEnumerable()</code> method. This method determines if the specified property, string or symbol, is an enumerable own property of the object. If the object does not have the specified property, this method returns <code>false</code>.</p>\n<p>This method is equivalent to <a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/getOwnPropertyDescriptor\"><code>Object.getOwnPropertyDescriptor(obj, prop)?.enumerable ?? false</code></a>.</p>"}},{"type":"prose","value":{"id":"examples","title":"Examples","isH3":false,"content":""}},{"type":"prose","value":{"id":"using_propertyisenumerable","title":"Using propertyIsEnumerable()","isH3":true,"content":"<p>The following example shows the use of <code>propertyIsEnumerable()</code> on objects and arrays.</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>const o = {};\nconst a = [];\no.prop = \"is enumerable\";\na[0] = \"is enumerable\";\n\no.propertyIsEnumerable(\"prop\"); // true\na.propertyIsEnumerable(0); // true\n</code></pre></div>"}},{"type":"prose","value":{"id":"user-defined_vs._built-in_objects","title":"User-defined vs. built-in objects","isH3":true,"content":"<p>Most built-in properties are non-enumerable by default, while user-created object properties are often enumerable, unless explicitly designated otherwise.</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>const a = [\"is enumerable\"];\n\na.propertyIsEnumerable(0); // true\na.propertyIsEnumerable(\"length\"); // false\n\nMath.propertyIsEnumerable(\"random\"); // false\nglobalThis.propertyIsEnumerable(\"Math\"); // false\n</code></pre></div>"}},{"type":"prose","value":{"id":"direct_vs._inherited_properties","title":"Direct vs. inherited properties","isH3":true,"content":"<p>Only enumerable own properties cause <code>propertyIsEnumerable()</code> to return <code>true</code>, although all enumerable properties, including inherited ones, are visited by the <a href=\"/en-US/docs/Web/JavaScript/Reference/Statements/for...in\"><code>for...in</code></a> loop.</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>const o1 = {\n enumerableInherited: \"is enumerable\",\n};\nObject.defineProperty(o1, \"nonEnumerableInherited\", {\n value: \"is non-enumerable\",\n enumerable: false,\n});\nconst o2 = {\n // o1 is the prototype of o2\n __proto__: o1,\n enumerableOwn: \"is enumerable\",\n};\nObject.defineProperty(o2, \"nonEnumerableOwn\", {\n value: \"is non-enumerable\",\n enumerable: false,\n});\n\no2.propertyIsEnumerable(\"enumerableInherited\"); // false\no2.propertyIsEnumerable(\"nonEnumerableInherited\"); // false\no2.propertyIsEnumerable(\"enumerableOwn\"); // true\no2.propertyIsEnumerable(\"nonEnumerableOwn\"); // false\n</code></pre></div>"}},{"type":"prose","value":{"id":"testing_symbol_properties","title":"Testing symbol properties","isH3":true,"content":"<p><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol\"><code>Symbol</code></a> properties are also supported by <code>propertyIsEnumerable()</code>. Note that most enumeration methods only visit string properties; enumerability of symbol properties is only useful when using <a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign\"><code>Object.assign()</code></a> or <a href=\"/en-US/docs/Web/JavaScript/Reference/Operators/Spread_syntax\">spread syntax</a>. For more information, see <a href=\"/en-US/docs/Web/JavaScript/Enumerability_and_ownership_of_properties\">Enumerability and ownership of properties</a>.</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>const sym = Symbol(\"enumerable\");\nconst sym2 = Symbol(\"non-enumerable\");\nconst o = {\n [sym]: \"is enumerable\",\n};\nObject.defineProperty(o, sym2, {\n value: \"is non-enumerable\",\n enumerable: false,\n});\n\no.propertyIsEnumerable(sym); // true\no.propertyIsEnumerable(sym2); // false\n</code></pre></div>"}},{"type":"prose","value":{"id":"usage_with_null-prototype_objects","title":"Usage with null-prototype objects","isH3":true,"content":"<p>Because <code>null</code>-prototype objects do not inherit from <code>Object.prototype</code>, they do not inherit the <code>propertyIsEnumerable()</code> method. You must call <code>Object.prototype.propertyIsEnumerable</code> with the object as <code>this</code> instead.</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>const o = {\n __proto__: null,\n enumerableOwn: \"is enumerable\",\n};\n\no.propertyIsEnumerable(\"enumerableOwn\"); // TypeError: o.propertyIsEnumerable is not a function\nObject.prototype.propertyIsEnumerable.call(o, \"enumerableOwn\"); // true\n</code></pre></div>\n<p>Alternatively, you may use <a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/getOwnPropertyDescriptor\"><code>Object.getOwnPropertyDescriptor()</code></a> instead, which also helps to distinguish between non-existent properties and actually non-enumerable properties.</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>const o = {\n __proto__: null,\n enumerableOwn: \"is enumerable\",\n};\n\nObject.getOwnPropertyDescriptor(o, \"enumerableOwn\")?.enumerable; // true\nObject.getOwnPropertyDescriptor(o, \"nonExistent\")?.enumerable; // undefined\n</code></pre></div>"}},{"type":"specifications","value":{"title":"Specifications","id":"specifications","isH3":false,"specifications":[{"bcdSpecificationURL":"https://tc39.es/ecma262/multipage/fundamental-objects.html#sec-object.prototype.propertyisenumerable","title":"ECMAScript Language Specification"}],"query":"javascript.builtins.Object.propertyIsEnumerable"}},{"type":"browser_compatibility","value":{"title":"Browser compatibility","id":"browser_compatibility","isH3":false,"query":"javascript.builtins.Object.propertyIsEnumerable"}},{"type":"prose","value":{"id":"see_also","title":"See also","isH3":false,"content":"<ul>\n <li><a href=\"/en-US/docs/Web/JavaScript/Enumerability_and_ownership_of_properties\">Enumerability and ownership of properties</a></li>\n <li><a href=\"/en-US/docs/Web/JavaScript/Reference/Statements/for...in\"><code>for...in</code></a></li>\n <li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/keys\"><code>Object.keys()</code></a></li>\n <li><a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/defineProperty\"><code>Object.defineProperty()</code></a></li>\n</ul>"}}],"toc":[{"text":"Try it","id":"try_it"},{"text":"Syntax","id":"syntax"},{"text":"Description","id":"description"},{"text":"Examples","id":"examples"},{"text":"Specifications","id":"specifications"},{"text":"Browser compatibility","id":"browser_compatibility"},{"text":"See also","id":"see_also"}],"summary":"The propertyIsEnumerable() method of Object instances returns a boolean indicating whether the specified property is this object's enumerable own property.","popularity":0.0046,"modified":"2023-08-09T10:45:23.000Z","other_translations":[{"locale":"de","title":"Object.prototype.propertyIsEnumerable()","native":"Deutsch"},{"locale":"es","title":"Object.prototype.propertyIsEnumerable()","native":"Español"},{"locale":"fr","title":"Object.prototype.propertyIsEnumerable()","native":"Français"},{"locale":"ja","title":"Object.prototype.propertyIsEnumerable()","native":"日本語"},{"locale":"ko","title":"Object.prototype.propertyIsEnumerable()","native":"한국어"},{"locale":"pt-BR","title":"Object.prototype.propertyIsEnumerable()","native":"Português (do Brasil)"},{"locale":"ru","title":"Object.prototype.propertyIsEnumerable()","native":"Русский"},{"locale":"zh-CN","title":"Object.prototype.propertyIsEnumerable()","native":"中文 (简体)"}],"pageType":"javascript-instance-method","source":{"folder":"en-us/web/javascript/reference/global_objects/object/propertyisenumerable","github_url":"https://github.com/mdn/content/blob/main/files/en-us/web/javascript/reference/global_objects/object/propertyisenumerable/index.md","last_commit_url":"https://github.com/mdn/content/commit/5e878acadb7afcf0443b619b1d2f70a4dfafd679","filename":"index.md"},"short_title":"Object.prototype.propertyIsEnumerable()","parents":[{"uri":"/en-US/docs/Web","title":"References"},{"uri":"/en-US/docs/Web/JavaScript","title":"JavaScript"},{"uri":"/en-US/docs/Web/JavaScript/Reference","title":"Reference"},{"uri":"/en-US/docs/Web/JavaScript/Reference/Global_Objects","title":"Standard built-in objects"},{"uri":"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object","title":"Object"},{"uri":"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/propertyIsEnumerable","title":"Object.prototype.propertyIsEnumerable()"}],"pageTitle":"Object.prototype.propertyIsEnumerable() - JavaScript | MDN","noIndexing":false}}</script></body></html>