5. Trying It All Together


#1

Hi I am new here so I don't know much about coding, but I tried to edit the code and try to see if I could make it a sentence or two about me. I got everything right the first time on the instructions. I then wanted to make it more about me until it went haywire. Here is the sentence I tried to make: "Hello. My name is Miguel. I am 20 years old." Here is the code I put:

// Nicely written function:
var calculate = function (number) {
var val = number * 10;
console.log(val);
};
// Badly written function with syntax errors!

var greeting = function (name) {
console.log("Hello." + " My name is" + greeting + "I am" + calculate + "years old.");
};
greeting("Miguel.");
calculate(2);

This is what the output was:

"Hello. My name isfunction (name) {
console.log("Hello." + " My name is" + greeting + "I am" + calculate + "years old.");
}I amfunction (number) {
var val = number * 10;
console.log(val);
}years old.
20"

Where did I go wrong and what happened?


#2

@anoncookie,

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

@anoncookie,

var calculate = function (number) {
      var val = number * 10;
      return val;
};

// a greeting Function taking 2 PARAMETER
var greeting = function (name,calculated) {
      console.log("Hello." +
               "\n My name is " + name + "\nI am " + calculated + "years old."); 
}; 

//Calling greeting Function with 2 ARGUMENTS
greeting("Miguel.",calculate(2));

#4

@leonhard_wettengmx_n
Thank you for explaining this to me. I still have some questions to ask. As I said before I am new here and I don't know much about coding. The questions are:
What is a parameters and what are their use for it?
And
What do return-statements do?

Thank you in advanced.


#5

@anoncookie,

-1

answer to PARAMETER vs ARGUMENT
please read
= http://discuss.codecademy.com/t/5-trying-it-all-together/21358/2?u=leonhard_wettengmx_n

-2

What is the return statement
https://developer.mozilla.org/nl/docs/Web/JavaScript/Reference/Statements/return