9. Functions with 2 parimeters


#1

This is what I have entered. It say its correct and move on to next chapter but im not sure if something is missing.

var perimeterBox = function(length,width)
{
return length + length + width + width;
(perimeterBox(2,4)) ;
}
At this point, It say it's correct and move on to next chapter but I'm not sure if something is missing.

Next I tried writing console.log to get an output but nothing populated.

var perimeterBox = function(length,width) {
return length + length + width + width;
console.log (perimeterBox(2,4)) ;
}

Am I on the right track??


#2

Hi! I believe you're supposed to call the function outside of the curly braces.

var perimeterBox = function (length, width) {
return length + length + width + width;

}

perimeterBox(5,3);


#3

@rishit005,
What you must know is
that the return statement

  • will return a =result= with No-Display
  • the function will immediately be =exited=
    (no further commands of the FUNCTION-BODY will be executed )

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

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 ) );

#4

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