Function and return- itemCount, orderCount and takeOrder relation


here i need something to be clear about the relation of orderCount and takeOrder.

in link above i found below code:

let orderCount= 0;
const takeOrder = (topping, crustType) => {
console.log('Order: ’ + crustType + ’ pizza topped with ’ + topping);
const getSubTotal=(itemCount)=> {
return itemCount*7.5;
takeOrder(‘mushroom’, ‘thin crust’);
takeOrder(‘spinach’, ‘whole wheat’);
takeOrder(‘pepperoni’, ‘brooklyn style’);


for loging the console of getSubTotal it returns itemCount which is 3 and multiply with 7.5.

Q.1 dose the itemCount represent the orderCount.
Q.2 if this, how the orderCount find out how many time i place takeOrder.
Q.3 What is the relation among the three thing of itemCount, orderCount and takeOrder, where i call getSubTotal(orderCount) and it returns total number of takeOrder * 7.5

answer will help me a lot.
thanks in advance.


A.1 function parameters (itemCount) are placeholders until the function is called and a argument (orderCount) is supplied for the parameter, then the value of orderCount is passed to itemCount

this means values don’t have to be same every time:

const addFunction = (x, y) => {
    return x + y


I think for all questions, understanding how parameters and arguments works is crucial

other important things: functions don’t execute until called, that is why function parameters can be placeholders



  1. Yes
  2. In the const takeOrder() function at the top, the operation orderCount++ is acting as a counter. Every time takeOrder() is called at the bottom, for different pizzas, the orderCount++ adds 1 to the value. Since the value initially started as 0 (let orderCount= 0;), orderCount++ gets used 3 times, and has a final value of 3.
  3. itemCount is a placeholder for orderCount, and itemCount could be anything. I agree that it’s a bit confusing at this point in the tutorial since it’s never explicitly addressed. However, it could just as well have been orderCount again. getSubTotal() needs some parameter to generate a value, since it was established as undefined. Calling getSubTotal(orderCount); provides getSubTotal() with a value from our counter orderCount++; As I said earlier that 3 takeOrder() functions we called incremented the value to 3, so getSubTotal(orderCount) will now take 3 * 7.5 and return that value to getSubTotal in the console.


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