Today’s  in India GST calculation needed for every software So. I am thinking about the developer who wants to implement GST calculation on there software or website. They can be used my scripts for GST calculation.

function Calculation(){
    var rate = 0, disc = 0, cgst=0, sgst=0, igst=0, total=0;
    

    this.setRate = function(mainPrice){
        rate = mainPrice;
    }

    this.setDiscount = function(discount, type='%'){
        if(type === '%'){
            disc = rate * discount / 100
        }else{
            disc = discount;
        } 
    }

    this.setCGST = function(val, type='%'){
        if(type === '%'){
            cgst = (rate - disc) * val/100;
        }else{
            cgst = val;
        }
    }

    this.setSGST = function(val, type='%'){
        if (type === '%') {
            sgst = (rate - disc) * val / 100;
        }else{
            sgst = val;
        }
    }

    this.setIGST = function(val, type='%'){
        if (type === '%') {
            igst = (rate - disc) * val / 100;
        } else {
            igst = val;
        }
    }

    this.getCost = function(igstApply=false){
        if (igstApply === false) {
            total = (rate - disc) + (cgst + sgst);
        }else{
            total = (rate - disc) + igst;
        }

        return total;
    }
}


// How To Use

var c = new Calculation();
c.setRate(100);
c.setDiscount(20);
c.setCGST(5);
c.setSGST(5);
c.setIGST(18);
var cost = c.getCost();
var costWithIgst = c.getCost(true);

console.log('Actual Cost of the product: '+cost);
console.log('Actual Cost of the Service: ' + costWithIgst);

function Calculation(){
    var rate = 0, disc = 0, cgst=0, sgst=0, igst=0, total=0;
    

    this.setRate = function(mainPrice){
        rate = mainPrice;
    }

    this.setDiscount = function(discount, type='%'){
        if(type === '%'){
            disc = rate * discount / 100
        }else{
            disc = discount;
        } 
    }

    this.setCGST = function(val, type='%'){
        if(type === '%'){
            cgst = (rate - disc) * val/100;
        }else{
            cgst = val;
        }
    }

    this.setSGST = function(val, type='%'){
        if (type === '%') {
            sgst = (rate - disc) * val / 100;
        }else{
            sgst = val;
        }
    }

    this.setIGST = function(val, type='%'){
        if (type === '%') {
            igst = (rate - disc) * val / 100;
        } else {
            igst = val;
        }
    }

    this.getCost = function(igstApply=false){
        if (igstApply === false) {
            total = (rate - disc) + (cgst + sgst);
        }else{
            total = (rate - disc) + igst;
        }

        return total;
    }
}


// How To Use

var c = new Calculation();
c.setRate(100);
c.setDiscount(20);
c.setCGST(5);
c.setSGST(5);
c.setIGST(18);
var cost = c.getCost();
var costWithIgst = c.getCost(true);

console.log('Actual Cost of the product: '+cost);
console.log('Actual Cost of the Service: ' + costWithIgst);

You can use this code everywhere.