Object Definition

<!DOCTYPE html>
<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:"Ahmed ",
  lastName:"adel",
  age:50, eyeColor:"blue"
}

const x = person;
x.age = 10;      // Will change both x.age and person.age
const x = person;
x.age = 10;

document.getElementById("demo").innerHTML =
person.firstName + " is " + person.age + " years old.";
</script>

</body>
</html>

JavaScript Objects

JavaScript objects are mutable.

Any changes to a copy of an object will also change the original object: