I can't resolve this error


#1
var cashRegister = {
    total:0,
    lastTransactionAmount:0,
    //Dont forget to add your property
    add: function(itemCost) {
        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(){
        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();

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


//Show the total bill
console.log('Your bill is '+cashRegister.total);

this my code and it gives error
Oops, try again.
false
I don't know were I am wrong. Please help.


#2

The code runs fine so I suspect it is an error in following the instructions. We are asked to void only the last transaction (4 chocolate) and change it to 3:

cashRegister.voidLastTransaction();
cashRegister.scan("chocolate", 3);

Your total should show as 8.55. Tested and passes.


#3

Yes, it worked. Thank you