5. Bleep Bleep


#1


https://www.codecademy.com/en/courses/close-the-super-makert/0/5?curriculum_id=506324b3a7dffd00020bf661#


console:Your bill is NaN
popup window:Oops, try again. false


var cashRegister = {
    total:0,
    //Dont forget to add your property
    add: function(itemCost) {
        this.total +=  itemCost;
        var 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(lastTransactionAmount) {
        this.total = this.total  - 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('chocolate',3);

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

please help, I have been stuck for a long time on this exercise


#2

Hello Matryas,

You forgot to add "this." to "lastTransactionAmount" instead of "var". Same thing for "this.total = this.total - lastTransactionAmount" and don't forget the ";" at the end of the line. :wink:


#3

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