Exercise on 5.Return


#1

Hi, I have a question about interpretation cause I’m just learning JS recently.
In the last line, getSubTotal call, the instructions of the exercise told me to use the orderCount variable as a parameter instead itemCount. I really don’t understand, why. Would you help me please? Thanks.

var orderCount = 0;

function getSubTotal(itemCount){
return itemCount * 7.5
}

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

takeOrder(‘sauce’, ‘large crust’);
takeOrder(‘onion’, ‘burned crust’);
takeOrder(‘beans’, ‘empty crust’);

console.log(getSubTotal(orderCount));




#2

With

function getSubTotal(itemCount){
   return itemCount * 7.5
}

you have defined the named Function =getSubTotal()=
and this =getSubTotal()= function takes 1 PARAMETER itemCount

Now if you call the =getSubTotal()= function
you will have to provide 1 ARGUMENT in this case the VARIABLE orderCount
like in your

For a better understanding read
+++ 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

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