Function Clarification


#1

I understand the use of functions - sort of...

Ex. 1
var divideByThree = function (number)
{
var val = number / 3;
console.log(val);
};

The var "divideByThree" is decared so we can call it anytime we need it so that we dont have to type EX. 2 right?

Ex. 2
var val = number / 3
console.log(val);

If thats the case for using this function isnt that just a little lazy?


#2

@cane.able,

You are in the process of learning the SYNTAX
of a function definition.
I a separate Post i'll give you a short feel of the function....

Working with functions you will be operating in area's like
namespacing
using the closure
Immediately invoked function expressions (IIFE)

With a google search
== dicussions /opinions ==
javascript what are functions used for site:stackoverflow.com
http://stackoverflow.com/questions/17212557/javascript-what-are-immediate-functions-used-for

You should also be aware,
that with

var test = function( parameter ) { } ;

( notice:: a semi-colon-; )
you are assigning a so-called anonymous function to the variable test

and with

function test( parameter ) { }

( notice:: no-semi-colon-; )
you are declaring a so-called named function test
http://stackoverflow.com/questions/336859/var-functionname-function-vs-function-functionname?rq=1

Reference

google search
== the Book ==
javascript [your question] site:developer.mozilla.org

== discussions / opinions ==
javascript [your question] site:stackoverflow.com

== guidance ==
www.crockford.com
http://javascript.crockford.com/code.html <---JavaScript code-convention
http://javascript.crockford.com/survey.html
http://stackoverflow.com/questions/9549780/what-does-this-symbol-mean-in-javascript
https://developer.mozilla.org/en-US/docs/Web/JavaScript/A_re-introduction_to_JavaScript
www.developer.mozilla.org/en-US/docs/Web/JavaScript/Guide


#3

@cane.able,

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 ) );