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<html><body><h1>JavaScript Object</h1><h2>The getOwnPropertyNames() Method</h2><p>This example list all the properties of an object.</p><p id="demo"></p><script>// Create an Object:const person = { firstName: "John", lastName: "Doe", language: "EN"}// Change PropertyObject.defineProperty(person, "language", {enumerable:false});// Display all Propertiesdocument.getElementById("demo").innerHTML = Object.getOwnPropertyNames(person);</script></body></html>