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JS defineProperty()

// Create an Object:
var person = {
  firstName: "John",
  lastName : "Doe",
  language : "NO", 
};
// Change a Property:
Object.defineProperty(person, "language", {
  value: "EN",
  writable : true,
  enumerable : true,
  configurable : true
});
// Enumerate Properties
txt = "";
for (var x in person) {
  txt += person[x] + "<br>";
}
document.getElementById("demo").innerHTML = txt;