A library to handle Currencies in JavaScript. By default, It will handle Indian Currency. Change 'Currency.prototype.locale' & 'Currency.prototype.currency' to Handle whatever currency of your wish

indianCurrency.js

Number.prototype.toCurrency = function(){ // Prototype Added to Number property to convert Number into Currncy Object
 return new Currency(this.valueOf());
};
function Currency(args){ //Important: Currency Object Constructor
    this.value = args*Currency.prototype.multiple;
    return this.value;
}
Currency.prototype.multiple = 1000;  // Currency is always in paisa. If u want accuracy of two digit after decimal set it 100; For three digit accuracy set into 1000
Currency.prototype.locale = 'en-IN'; // Currency should be Displayed in Indian Currency format '1,10,00,000'(Crores,Lakhs,Thousands)
Currency.prototype.currency = 'INR'; // Symbol shown before the amount
Currency.prototype.valueOf = function(){ // Important: When we declare valueOf function the variable can be use alike primitive data type
    return this.value; //Value to be returned when object.valueOf() is called
}
Currency.prototype.showCurrency = function(){ // Display the Number as Currency with Currency symbol
    return (this.valueOf()/Currency.prototype.multiple).toLocaleString(Currency.prototype.Locale, { style: 'currency', currency: Currency.prototype.currency });
}