Benefits of utilizing a methodology in OOP JavaScript

Question

Benefits of utilizing a methodology in OOP JavaScript

Recently, I stumbled upon a JavaScript file that was constructed in quite an unconventional way:

var modal = (function(){
  var method = {};

  // Function to center the modal in the viewport
  method.center = function () {};

  // Function to open the modal
  method.open = function (settings) {};

  // Function to close the modal
  method.close = function () {};

  return method;
}());

While I grasp the concept of encapsulating functions within the "modal" object, I can't help but wonder why all the functions are bound to method and then returned at the end?

javascript oop object

Answer 1

Answer №1

Utilizing a design pattern to organize functionalities into modules is an effective way to eliminate reliance on global variables, ultimately resulting in improved code quality.

When a function is called, it creates a 'closure' which acts as a scope for variables declared within the function. These variables persist even after the function has finished executing and are not accessible outside of the function.

       var modal = (function(){
       var method = {};
       // Center the modal in the viewport
       method.center = function () {};

      // Open the modal
      method.open = function (settings) {};

      // Close the modal
      method.close = function () {};

      return method;
    }());  // The function call here establishes a "closure"

To expose certain members of the module externally, they must be returned from the function. In this case, using return method allows method to become a public object of the module that can be accessed externally.
Rather than creating individual variables like open or
```
close</code, the associated functions are assigned as properties (keys) of the main <code>method
```
object. By returning a single object, all related functions become accessible, reducing the number of identifiers within the closure scope.

For further reading on this modular pattern, check out this informative article:

Answer 2

Utilizing a design pattern to organize functionalities into modules is an effective way to eliminate reliance on global variables, ultimately resulting in improved code quality.

When a function is called, it creates a 'closure' which acts as a scope for variables declared within the function. These variables persist even after the function has finished executing and are not accessible outside of the function.

       var modal = (function(){
       var method = {};
       // Center the modal in the viewport
       method.center = function () {};

      // Open the modal
      method.open = function (settings) {};

      // Close the modal
      method.close = function () {};

      return method;
    }());  // The function call here establishes a "closure"

To expose certain members of the module externally, they must be returned from the function. In this case, using return method allows method to become a public object of the module that can be accessed externally.
Rather than creating individual variables like open or
```
close</code, the associated functions are assigned as properties (keys) of the main <code>method
```
object. By returning a single object, all related functions become accessible, reducing the number of identifiers within the closure scope.

For further reading on this modular pattern, check out this informative article:

Answer 3

Answer №2

When considering that particular code snippet, there is no distinct advantage. It essentially performs the same function as:

var modal = {

  // Center the modal in the viewport
  center: function () {},

  // Open the modal
  open: function (settings) {},

  // Close the modal
  close: function () {},

};

However, introducing a local variable within the function brings about a notable difference:

var modal = (function(){

  // a private variable specific to the object
  var local = 'hello world';

  var method = {};

  // Center the modal in the viewport
  method.center = function () {};

  // Open the modal
  method.open = function (settings) {};

  // Close the modal
  method.close = function () {};

  return method;
}());

With this adjustment, all the methods within the object have access to the private variable, yet it remains isolated from external access.

Answer 4

When considering that particular code snippet, there is no distinct advantage. It essentially performs the same function as:

var modal = {

  // Center the modal in the viewport
  center: function () {},

  // Open the modal
  open: function (settings) {},

  // Close the modal
  close: function () {},

};

However, introducing a local variable within the function brings about a notable difference:

var modal = (function(){

  // a private variable specific to the object
  var local = 'hello world';

  var method = {};

  // Center the modal in the viewport
  method.center = function () {};

  // Open the modal
  method.open = function (settings) {};

  // Close the modal
  method.close = function () {};

  return method;
}());

With this adjustment, all the methods within the object have access to the private variable, yet it remains isolated from external access.

Benefits of utilizing a methodology in OOP JavaScript

Answer №1

Answer №2

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