BLEEP BLEEP - Bulding a Cash Register (result 10.35, false)


My bill result is 10.35 and I get an error message "Oops, try again. false"

What is wrong with my code below?

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

add: function(itemCost) { +=  itemCost;
    this.lastTrasactionAmount = 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.lastTransactionAmount;



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

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


this.lastTrasactionAmount = itemCost; // this.lastTransactionAmount= itemCost;

There is a small spell error, all other codes are working fine.


Wow. It is amazing how many times I go nuts rearranging code to find out 30 min later that my error is an oversight. Thank so much!