the code displayed here is as follows:

var orderCount = 0;

function takeOrder(topping, crustType) {
console.log('Order: ’ + crustType + ’ crust topped with ’ + topping);
orderCount = orderCount + 1;

function getSubTotal(itemCount) {
return itemCount * 7.5;

function getTax(itemCount){
return getSubTotal(orderCount) * 0.06;

function getTotal(){
return getSubTotal(orderCount) + getTax();

takeOrder(‘bacon’, ‘thin’);
takeOrder(‘pepperoni’, ‘regular’);
takeOrder(‘pesto’, ‘thin’);


Why do we need to make another itemCount? I am a bit confused, because it is not declared anywhere in the code, it just appears in the bracket all of a sudden. How does the system know what it is and how to intepret it?

Thanks a lot!

A function doesn’t provide its own input, it acts on the input when it is invoked

function(x) { return x + 1 }

If x was already defined as 5 this function would be nearly useless because it would always return 6

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