Cash Register Code

var cashRegister = {
total:0,
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;
},

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

EXAMPLE: Buying 1 egg, 1 milk, 1 magazine, and 3 chocolate. Accidentally scanned one extra chocolatay. Fix it dummy.
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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