JavaScript Encapsulation

The JavaScript Encapsulation is a process of binding the data (i.e. variables) with the functions acting on that data. It allows us to control the data and validate it. To achieve an encapsulation in JavaScript: –

• Use var keyword to make data members private.
• Use setter methods to set the data and getter methods to get that data.

The encapsulation allows us to handle an object using the following properties:

Read/Write – Here, we use setter methods to write the data and getter methods read that data.

Read Only – In this case, we use getter methods only.

Write Only – In this case, we use setter methods only.

JavaScript Encapsulation Example

Let’s see a simple example of encapsulation that contains two data members with its setter and getter methods.

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Output:

John 80  

JavaScript Encapsulation Example: Validate

In this example, we validate the marks of the student.

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Output:

John undefined  

JavaScript Encapsulation Example: Prototype-based approach

Here, we perform prototype-based encapsulation.

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Output:

John 80