You Deserved It! Riddle: What is NaN but is a number?


#1


https://www.codecademy.com/courses/close-the-super-makert/0/7?curriculum_id=506324b3a7dffd00020bf661#


So, my code would fail this test because the cashRegester.total returns NaN. I know this because I started running some elements of the code I personally was adding through a console.log(). The weird thing is and why I'm lost here is because I didn't write anything that I am aware of that affects that total property of the register. And what really throws me for a loop is that I console.log()'ed typeof for the total returning NaN and lo and behold it says it's a number. Help?


function StaffMember(name,discountPercent){
    this.name = name;
    this.discountPercent = discountPercent;
}

var sally = new StaffMember("Sally",5);
var bob = new StaffMember("Bob",10);

// Create yourself again as 'me' with a staff discount of 20%
var me = new StaffMember ('Austin', 20);

var cashRegister = {
    total:0,
    lastTransactionAmount: 0,
    add: function(itemCost){
        this.total += (itemCost || 0);
        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;
        this.lastTransactionAmount = 0;
    },
    // Create a new method applyStaffDiscount here
    applyStaffDiscount: function (employee) {
        this.total -= this.total * (100 - employee.discountPercent / 100);
    }
};

cashRegister.scan('eggs',1);
cashRegister.scan('milk',1);
cashRegister.scan('magazine',3);
// Apply your staff discount by passing the 'me' object 
// to applyStaffDiscount
cashRegister.applyStaffDiscount('me');

// Show the total bill
console.log('Your bill is '+cashRegister.total.toFixed(2));

console.log(cashRegister.applyStaffDiscount('bob'));
console.log(cashRegister.total);
console.log(me.discountPercent);
console.log(typeof cashRegister.total);


#2

here:

cashRegister.applyStaffDiscount('me');

you call the applyStaffDiscount with as argument 'me', right?

so then we get:

this.total -= this.total * (100 - 'me'.discountPercent / 100);

the string 'me' doesn't have a discount percentage? You should instead use your staff member (me), same for bob.

'me' is a string
me is a staff member


#3

Ooooooooh, but of course. I make this kind of mistake all the time. As soon as I finish with this js lesson, which is now, I'm going back through it just to study the exact syntax of all the things I learned. That fixed it, thank you.


#4