Function syntax


#1

Function syntax

I have no idea what the purpose is of this exercise. When i read the instructions, it like that I have to rewrite the same code that is still standing on line 6 and 7. But then I get an error message, try again.

So please, who wants to explain the purpose of this exercise?


#2

@steven_geertsema,

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

@steven_geertsema,
They want to introduce
- function parameter
- argument
- difference between console.log() Method and the usage of the return statement
-call of a function, providing an argument
Read the function talk to get the feeling......


#4

Thanks for the explain. But it is still not clear for me. I now know what the purpose is of the exercise but I have not any idea how to convert it is some code.


#5

@steven_geertsema,
For exercise 6:: https://discuss.codecademy.com/t/dont-repeat-yourself-d-r-y/33704/3?u=leonhard.wettengmx.n
For exercise 7:: https://discuss.codecademy.com/t/using-functions-and-returns-7-13/1214/5?u=leonhard.wettengmx.n


#6

I wondered why we use the " " between param1 and param2. Your answer provided the solution. Thanks.


#7

@tonysgarcia,
http://javascript.crockford.com/code.html <---JavaScript code-convention