How can i track the transaction?


#1

this what it reached but still not working

var cashRegister = {
    total:0,
    lastTransactionAmount: 0,
    //Dont forget to add your property
    add: function(itemCost) {    
        this.lastTransactionAmount = 0;
        this.total +=  itemCost;
        this.lastTransactionAmount += itemCost;
    },  
    scan: function(item,quantity) {
        switch (item) {
        case "eggs": this.add(0.98 * quantity); break;
        case "milk": this.add(1.23 * quantity); break;
        case "magazine": this.add(4.99 * quantity); break;
        case "chocolate": this.add(0.45 * quantity); break;
        }
        return true;
    },
    
    //Add the voidLastTransaction Method here
    voidLastTransaction: function() {
        console.log(this.total - this.lastTransactionAmount);
    }
};

cashRegister.scan('eggs',1);
cashRegister.scan('milk',1);
cashRegister.scan('magazine',1);
cashRegister.scan('chocolate',4);

//Void the last transaction and then add 3 instead
cashRegister.voidLastTransaction();
//Show the total bill
console.log('Your bill is '+cashRegister.total);

#2

@aakhaleda,

//Void the last transaction and then add 3 instead
cashRegister.voidLastTransaction()
cashRegister.scan('chocolate',3);