Closure to replace switch case 3

closureusage3.js

var total = (function f(item) {
    var tax= 0.08;
    var fee = 10;
    var sinTax = 0.02;
    
    var calGas = function(price) { return price + price*tax + fee; };
    var calSinProd = function(price) { return price + price*tax + price*sinTax; };
    var calFood = function(price) { return price + price*tax; };
    
    var h = {
        'gas': calGas ,
        'wine': calSinProd,
        'cigarette': calSinProd        
    };
    return (typeof h[item] == 'undefined') ? calFood : h[item];
})('gas')(100);

alert(total);