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var cashRegister = { | |
total:0, | |
lastTransactionAmount:0, | |
//Dont forget to add your property | |
add: function(itemCost) { | |
this.total += itemCost; | |
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(); | |
cashRegister.scan('chocolate', 3); | |
//Show the total bill | |
console.log('Your bill is '+cashRegister.total); |
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