Bleep Bleep


#1

<PLEASE USE THIS TEMPLATE TO HELP YOU CREATE A GREAT POST!>

<Below this line, add a link to the EXACT exercise that you are stuck at.>

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

<Below this line, in what way does your code behave incorrectly? Include ALL error messages.>

my code gives the right output, but it wont accept as i finished the course… it says “Oops, try again. Did you remember to scan again 3 of the last item?” but i think i did everything ok.

```

var cashRegister = {
total:0,
//Dont forget to add your property
lastTransactionAmount:0,
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(lastTransactionAmount){
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.lastTransactionAmount)

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

<do not remove the three backticks above>

#2

your voidLastTransaction method:

voidLastTransaction: function(lastTransactionAmount)

why did you give it a parameter? we can access lastTransactionAmount through self, so voidLastTransaction doesn’t need a parameter. So calling the method also doesn’t require a argument


#3

like this right?

var cashRegister = {
    total:0,
    //Dont forget to add your property
    lastTransactionAmount:0,
    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()

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

thats where i stumbled too, but it gives me the same ‘Message’


#4

from the instructions:

Finally, scan only 3 of the same item instead.

the customer wants to buy 3 chocolates, that why we have to void the last transaction, and scan again but this time only 3 pieces of chocolate.


#5

oh lol… stupid me didn’t understand the customer… thank you !


#6

Customers aren’t very smart, that is where we programmers come in to fix there problems :wink:

You’re welcome :slight_smile:


#7

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