Problem with the orderCount value


#1

I dont understand why give the getSubTotal function 22.5 instead of 7.5? I think the orderCount value is 1, not 3.
What is wrong in this code, what cause this problem?

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;
}

takeOrder('bacon', 'thin');
takeOrder('pepperoni', 'regular');
takeOrder('pesto', 'thin');

console.log(getSubTotal(orderCount));
console.log (orderCount);


#2

+++ function talk

Please read the Function talk
and concentrate on
- parameter
- argument
- calling a function
- usage of the return statement

the FUNCTION talk

var myFunc = function( param1, param2) {
       //Begin of  anonymous FUNCTION-BODY
       //VARIABLE -myFunc- has an -anonymous function- assigned
       //this -anonymous function- has 2 PARAMETERS param1 and param2
       //param1 and param2 PARAMETERS are used 
       //as -local- VARIABLES throughout the FUNCTION-BODY

      console.log( param1 + " and " + param2 ) ;

      //End of anonymous FUNCTION-BODY
};

If you want to call/execute the anonymous function
you will have to add a pair of parentheses to the variable myFunc
like
myFunc();
As the anonymous function was defined
as having 2 parameters
you have to provide 2 arguments
in our case 2 string VALUES "Alena" and "Lauren"
like
myFunc("Alena","Lauren");

some quotes from the outer-world:

**argument is the value/variable/reference being passed in,
parameter is the receiving variable used within the function/block**

OR

**"parameters" are called "formal parameters",
while "arguments" are called "actual parameters".**

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

function with 1 parameter using return-statement

var myFunction = function( param1 ) {
       //Begin of FUNCTION-BODY
       //myFunction =function= has 1 PARAMETER param1
       //this param1 PARAMETER is used as a -local- VARIABLE
       //throughout the FUNCTION-BODY

      return param1;

      //End of FUNCTION-BODY
      };

you have defined a myFunction function
which takes 1 parameter param1
this param1 parameter is used
as a variable throughout the FUNCTION-BODY.

If you want to call/execute this myFunction function
and this myFunction function was defined
as having 1 parameter param1
you will have to provide 1 argument
in our case a "number VALUE" 4
myFunction( 4 );

some quotes from the outer-world:

**argument is the value/variable/reference being passed in,
parameter is the receiving variable used within the function/block**

OR

**"parameters" are called "formal parameters",
while "arguments" are called "actual parameters".**

============================================

As you are using the return-statement in your myFunction function
you will only get a return-value no-display.
You can however capture this return-value in a variable
and then use the console.log()-method to do a display.

var theResult = myFunction( 4 );
console.log( theResult );

OR directly

console.log( myFunction( 4 ) );

#3

//declaring the GLOBAL variable =orderCount=
var orderCount = 0;

//declaring the =named function= takeOrder
//having 2 PARAMETER =topping= and =crustType=
function takeOrder(topping, crustType) {
   //every time =takeOrder= is called, provided with 2 ARGUMENTS
   // the PARAMETER will be taking on the VALUE of the provided ARGUMENT
   // and these VALUES will be used in your =console.log()=
   console.log('Order: ' + crustType + ' crust topped with ' + topping);
   //everytime the =takeOrder()= function is =called=
   //the GLOBAL variable =orderCount= is incremented by 1
   orderCount = orderCount + 1
}

function getSubTotal(itemCount) {
    return itemCount * 7.5;
}
//orderCount is 0
takeOrder('bacon', 'thin');
//orderCount is now 1
takeOrder('pepperoni', 'regular');
//orderCount is now 2
takeOrder('pesto', 'thin');
//orderCount is now 3

console.log(getSubTotal(orderCount));
console.log (orderCount);

#4

Thanks a lot for your help! I totally forget that I call a takeOrder function tthree times
, and that cause the increasing value of the orderCount variable! How am I soo silly!

Have a nice day!


#5

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