encapsulated js

What is Encapsulated JS?

Encapsulated JS is a programming technique used to protect the data and behavior of JavaScript objects from being accessed or modified externally. It allows developers to create strong, isolated components or modules that can be reused across different applications without fear of interference or conflicts with other code.

Why use Encapsulated JS?

Encapsulation is a fundamental concept in object-oriented programming and provides several benefits, including:

• Data protection: Encapsulation helps prevent external code from accessing or modifying an object's internal state, reducing the risk of bugs and security vulnerabilities.
• Code reusability: By encapsulating code into modular components, developers can reuse them across different projects without worrying about conflicts with other code.
• Code maintainability: Encapsulated code is easier to maintain and debug because it's self-contained and has clear boundaries between different components.

How to implement Encapsulated JS?

There are several ways to implement encapsulation in JavaScript, including:

1. Using Object Literal

var person = {
  name: "John",
  age: 30,
  getAge: function() {
    return this.age;
  }
};

In this example, the person object is created using an object literal notation. The properties name and age are defined as public properties that can be accessed from outside the object. However, the getAge method is defined as a private method that can only be accessed from within the object. This is achieved by using the this keyword, which refers to the current object context.

2. Using Constructor Function

function Person(name, age) {
  var _name = name;
  var _age = age;

  this.getAge = function() {
    return _age;
  }
}

var person = new Person("John", 30);

In this example, the Person function is defined as a constructor function that takes two arguments: name and age. The private properties _name and _age are defined using the var keyword inside the constructor function. The getAge method is defined as a public method that can be accessed from outside the object by using the this keyword. A new instance of the Person object is created using the new keyword.

3. Using ES6 Classes

class Person {
  constructor(name, age) {
    var _name = name;
    var _age = age;

    this.getAge = function() {
      return _age;
    }
  }
}

var person = new Person("John", 30);

In this example, the Person class is defined using the ES6 class syntax. The private properties _name and _age are defined inside the constructor function. The getAge method is defined as a public method that can be accessed from outside the object. A new instance of the Person object is created using the new keyword.

Conclusion

Encapsulated JS is a powerful technique that can help developers create more secure, reusable, and maintainable code. By using encapsulation, developers can protect their code from external interference and reduce the risk of bugs and security vulnerabilities.