// module pattern

// The Module Pattern in JavaScript is a way to encapsulate code into independent, reusable modules.

// It allows you to organize your code, keep variables and functions private, and expose only the necessary functionality to the outside world.

// using IIFE

var Calc= (function(){

// private functions and variables

var result= 0;

function add(a,b){

return a+b;

}

function substract(a,b){

return a-b;

}

// public functions

return {

add: function(a,b){

result= add(a,b);

},

substract: function(a,b){

result= substract(a,b);

},

getResult: function(){

return result;

}

}

})();

Calc.add(4,5);

console.log(Calc.getResult()); // 9

// Without using IIFE

var Calculator= {

result: 0,

add: function(a,b){

this.result= a+b;

},

substract: function(a,b){

this.result= a-b;

},

getResult: function(){

return this.result;

}

}

Calculator.add(1,2);

console.log(Calculator.getResult()); // 3