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JS Object.getOwnPropertyNames()

This example list the properties of an object.

// Create an object:
const person = {
  firstName: "John",
  lastName: "Doe",
  language: "EN"
}

// Change Property
Object.defineProperty(person, "language", {enumerable:false});

// Display Properties
document.getElementById("demo").innerHTML = Object.getOwnPropertyNames(person);