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<html><body><h2>JavaScript Objects</h2><p>JavaScript objects are mutable.</p><p>Any changes to a copy of an object will also change the original object:</p><p id="demo"></p><script>const person = { firstName: "John", lastName: "Doe", age:50, eyeColor: "blue"};const x = person;x.age = 10;document.getElementById("demo").innerHTML =person.firstName + " is " + person.age + " years old.";</script></body></html>