Lesson 5 Pl help Error says Oops try again false


Here is my code

var cashRegister = {
//Dont forget to add your property
add: function(itemCost) {
this.total += 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;



//Void the last transaction and then add 3 instead

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


Small mistake, I thought you could catch it.
voidLastTransaction: function() {
this.total -= this.lastTransactionAmount;

The code you want is:

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

You dont need this.lastTransactionAmount, take out the this. and you should be fine.


Don't forget to add lastTransactionAmount to the cashRegister.add method:

"We need to keep track of how much the last transaction was. Modify the add method to keep track of the amount of the last transaction. This should be tracked in a new property, lastTransactionAmount."

Add this code into cashRegister.add method

this.lastTransactionAmount = itemCost;

That should probably fix your error.