5. Bleep Bleep


#1

I'm getting an error message "Oops, try again. false" and my final console.log statement is returning "Your bill is NaN"
I'm not sure what the issue is

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

My Code:

var cashRegister = {
    total: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(itemCost) {
        this.total -= itemCost;
    }
};

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);

#2

The amount to void is stored in the variable, this.lastTransactionAmount.

lastTransactionAmount: 0,

is what is meant by that instruction.


#3

So it should look like this?

oidLastTransaction: function(lastTransactionAmount) {
        this.total -= lastTransactionAmount;
        this.lastTransactionAmount=0;
}

#4

No parameter required. this.lastTransactionAmount is accessible in the scope of the object.

    voidLastTransaction: function() {
        this.total -= this.lastTransactionAmount;
        this.lastTransactionAmount=0;
}

#5

Sincere thanks for the help friend


#6

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