Encapsulation in JavaScript

In OOP, encapsulation is one of the most important concepts that allows an object to group the members of public and private classes under a single name. We use encapsulation to protect our classes against accidental or willful folly. Encapsulation means to enclose something in or as if something is in a capsule.

Now, we will see whether JavaScript supports encapsulation. If it does, we can say that JavaScript is an OOP language. Let's take a look at the following example:

var person = {
  "name" : "Harry Potter",
  "age" : 22,
};
alert(person.name);
person.name = "John";
alert(person.name);

If we run this on the console. The first alert box will print the following image:

We changed the variable name to John. Therefore, the second alert box will be similar to the following image:

What would happen if we accidently assigned a number to the name variable?

Assigning a number to the name variable is perfectly acceptable. As far as JavaScript is concerned, a variable can...