How does a function work?


#1

Here is my line of code:

var foodDemand = function (food) {
console.log("I want to eat" + " " + food);
foodDemand("Tiramisu");
};

What am I doing wrong or is it the website? I am not new to JavaScript.

The error is: > Oops, try again. It looks like you didn't print anything to the console.


Don't understand this function at all
#2

@josephgodwinke,
you are NOT closing the FUNCTON-BODY
with a closing-curly-bracket-}

var foodDemand = function (food) {
   console.log("I want to eat" + " " + food);
}

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

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".**


#3

@josephgodwinke,

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

Sorry i didnt include it but see edited question! Am using a console.log() method to get a display


#5

@josephgodwinke,
If you call the foodDemand() function within it's FUNCTION-BODY
the foodDemand() will be called upon itself....
you have ceated a -internal call loop-
which will bomb-out at the moment that you reach the maximum recursion depth

google search
== discussions / opinions ==
javascript maximum recursion site:stackoverflow.com
= http://stackoverflow.com/questions/7826992/browser-javascript-stack-size-limit


#6

sure i hacked it:

    var foodDemand = function(food) {
        console.log("I want to eat" + " " + food);
                 
    };
    foodDemand("Tiramisu");

its recursion i get it. Thanks


#7

Hi, I wrote the code like just like you did and it still pops up: "SyntaxError: missing ) after argument list".
Do you now why?


#8

@sasamilijasevic,

Please show us the code, you are using.....


#9

var foodDemand = function(food) {
console.log("I want to eat" + " " + food "!");
};
foodDemand("meat");


#10

Got it! I took out "!". Sorry. :slightly_smiling:


#11

@sasamilijasevic,

should be

console.log("I want to eat" + " " + food + "!");

#12

Thank you for the Tip, anyone wants to copy and paste this code in case you get stuck.
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
// Write your foodDemand function below.
// Last hint: In your reusable block of code, end each line
// with a semicolon (:wink:

var foodDemand = function(food) {
console.log("I want to eat" + " " + food + "!");
};
foodDemand("meat");